7Baggers

NetScout Systems, Inc
(NASDAQ:NTCT) 

NTCT stock logo

NetScout Systems, Inc. provides service assurance, security, and business analytics for digital business services against disruptions in availability, performance, and security. The company offers nGeniusONE management software that enables customers to predict, preempt, and resolve network and serv...

Founded: 1984
Full Time Employees: 2,502
Sector: Technology
Industry: Software-Infrastructure

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At a glance:
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Quarterly
Annual
    Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2003-09-30 2003-06-30 2003-03-31 
                                                                                                 
      revenue:
                                                                                                 
      product
    80,736,000 121,704,000 94,712,000 72,993,000 89,517,000 128,175,000 81,033,000 61,169,000 89,406,000 95,832,000 80,545,000 94,661,000 91,274,000 149,452,000 111,816,000 98,251,000 82,132,000 144,420,000 101,619,000 81,950,000 99,084,000 114,965,000 91,979,000 71,693,000 116,538,000 143,309,000 102,775,000 75,719,000 125,474,000 134,135,000 110,753,000 96,927,000 128,845,000 153,179,000 149,281,000 114,822,000 210,059,000 192,010,000 168,873,000 164,589,000 195,792,000 209,124,000 174,899,000 53,593,000 74,130,000 76,446,000 57,953,000 64,366,000 70,373,000 68,561,000 52,357,000 42,977,000 59,649,000 52,676,000 46,162,000 40,262,000 54,525,000 46,005,000 38,080,000 29,531,000 45,659,000 43,016,000 37,301,000 33,972,000 42,317,000 40,774,000 30,631,000 28,391,000 36,791,000 42,940,000 39,513,000 34,917,000 33,673,000 36,085,000 18,911,000 17,512,000 11,587,750 16,366,000 15,758,000 14,227,000 17,202,000 16,274,000 15,069,000 15,046,000 14,337,000 13,231,000 12,224,000 11,560,000 11,746,000 11,190,000    
      service
    122,299,000 128,979,000 124,305,000 113,754,000 115,470,000 123,844,000 110,075,000 113,396,000 114,037,000 122,240,000 116,257,000 116,477,000 116,819,000 120,092,000 116,265,000 110,561,000 109,059,000 117,774,000 110,299,000 108,322,000 114,305,000 113,774,000 113,360,000 112,122,000 112,813,000 116,715,000 113,646,000 110,305,000 109,528,000 111,873,000 113,044,000 108,184,000 106,379,000 115,765,000 107,582,000 110,934,000 108,861,000 110,182,000 103,175,000 104,363,000 90,095,000 98,555,000 86,211,000 47,150,000 45,255,000 46,387,000 45,646,000 43,486,000 41,944,000 41,867,000 39,740,000 38,828,000 38,428,000 38,891,000 38,383,000 36,099,000 34,937,000 37,292,000 34,544,000 33,765,000 32,321,000 33,320,000 32,112,000 32,839,000 29,557,000 29,941,000 29,060,000 29,671,000 29,295,000 29,110,000 29,348,000 25,690,000 24,017,000 17,656,000 10,701,000 10,400,000 10,145,000 10,133,000 9,322,000 9,348,000 8,612,000 8,637,000 8,581,000 8,271,000 7,839,000 8,354,000 7,826,000 8,105,000 7,314,000 7,268,000    
      total revenue
    203,035,000 250,683,000 219,017,000 186,747,000 204,987,000 252,019,000 191,108,000 174,565,000 203,443,000 218,072,000 196,802,000 211,138,000 208,093,000 269,544,000 228,081,000 208,812,000 191,191,000 262,194,000 211,918,000 190,272,000 213,389,000 228,739,000 205,339,000 183,815,000 229,351,000 260,024,000 216,421,000 186,024,000 235,002,000 246,008,000 223,797,000 205,111,000 235,224,000 268,944,000 256,863,000 225,756,000 318,920,000 302,192,000 272,048,000 268,952,000 285,887,000 307,679,000 261,110,000 100,743,000 119,385,000 122,833,000 103,599,000 107,852,000 112,317,000 110,428,000 92,097,000 81,805,000 98,077,000 91,567,000 84,545,000 76,361,000 89,462,000 83,297,000 72,624,000 63,296,000 77,980,000 76,336,000 69,413,000 66,811,000 71,874,000 70,715,000 59,691,000 58,062,000 66,086,000 72,050,000 68,861,000 60,607,000 57,690,000 53,741,000 29,612,000 27,912,000 27,318,000 26,499,000 25,080,000 23,575,000 25,814,000 24,911,000 23,650,000 23,501,000 22,628,000 22,000,000 20,489,000 20,097,000 19,526,000 18,890,000    
      yoy
    -0.95% -0.53% 14.60% 6.98% 0.76% 15.57% -2.89% -17.32% -2.23% -19.10% -13.71% 1.11% 8.84% 2.80% 7.63% 9.74% -10.40% 14.63% 3.20% 3.51% -6.96% -12.03% -5.12% -1.19% -2.40% 5.70% -3.30% -9.31% -0.09% -8.53% -12.87% -9.14% -26.24% -11.00% -5.58% -16.06% 11.55% -1.78% 4.19% 166.97% 139.47% 150.49% 152.04% -6.59% 6.29% 11.23% 12.49% 31.84% 14.52% 20.60% 8.93% 7.13% 9.63% 9.93% 16.41% 20.64% 14.72% 9.12% 4.63% -5.26% 8.50% 7.95% 16.29% 15.07% 8.76% -1.85% -13.32% -4.20% 14.55% 34.07% 132.54% 117.14% 111.18% 102.80% 18.07% 18.40% 5.83% 6.37% 6.05% 0.31% 14.08% 13.23% 15.43% 16.94% 15.89% 16.46%        
      qoq
    -19.01% 14.46% 17.28% -8.90% -18.66% 31.87% 9.48% -14.19% -6.71% 10.81% -6.79% 1.46% -22.80% 18.18% 9.23% 9.22% -27.08% 23.72% 11.38% -10.83% -6.71% 11.40% 11.71% -19.85% -11.80% 20.15% 16.34% -20.84% -4.47% 9.92% 9.11% -12.80% -12.54% 4.70% 13.78% -29.21% 5.54% 11.08% 1.15% -5.92% -7.08% 17.84% 159.18% -15.62% -2.81% 18.57% -3.94% -3.98% 1.71% 19.90% 12.58% -16.59% 7.11% 8.31% 10.72% -14.64% 7.40% 14.70% 14.74% -18.83% 2.15% 9.97% 3.89% -7.04% 1.64% 18.47% 2.81% -12.14% -8.28% 4.63% 13.62% 5.06% 7.35% 81.48% 6.09% 2.17% 3.09% 5.66% 6.38% -8.67% 3.62% 5.33% 0.63% 3.86% 2.85% 7.37% 1.95% 2.92% 3.37%     
      cost of revenue:
                                                                                                 
      total cost of revenue
    43,927,000 46,029,000 43,610,000 43,422,000 45,697,000 46,612,000 42,057,000 44,369,000 50,340,000 43,624,000 43,052,000 50,396,000 50,941,000 56,802,000 57,641,000 57,714,000 47,662,000 60,470,000 51,644,000 54,410,000 54,942,000 55,275,000 58,900,000 52,980,000 62,732,000 65,585,000 59,132,000 54,743,000 58,536,000 69,584,000 63,980,000 62,027,000 66,591,000 64,509,000 74,243,000 66,562,000 92,917,000 81,678,000 84,510,000 87,034,000 100,851,000 106,115,000 100,187,000 21,296,000 23,388,000 26,982,000 21,595,000 22,596,000 24,285,000 23,602,000 19,704,000 16,922,000 21,040,000 19,164,000 16,941,000 16,863,000 18,960,000 17,239,000 15,577,000 13,896,000 16,387,000 16,092,000 14,307,000 14,575,000 15,618,000 15,405,000 12,873,000 12,168,000 15,430,000 16,026,000 17,346,000 15,338,000 18,538,000 15,683,000 6,703,000 6,139,000 5,844,000 5,944,000 5,697,000 5,123,000 6,278,000 5,929,000 5,477,000 5,796,000 5,785,000 5,154,000 4,978,000 4,718,000 4,645,000 4,528,000    
      gross profit
    159,108,000 204,654,000 175,407,000 143,325,000 159,290,000 205,407,000 149,051,000 130,196,000 153,103,000 174,448,000 153,750,000 160,742,000 157,152,000 212,742,000 170,440,000 151,098,000 143,529,000 201,724,000 160,274,000 135,862,000 158,447,000 173,464,000 146,439,000 130,835,000 166,619,000 194,439,000 157,289,000 131,281,000 176,466,000 176,424,000 159,817,000 143,084,000 168,633,000 204,435,000 182,620,000 159,194,000 226,003,000 220,514,000 187,538,000 181,918,000 185,036,000 201,564,000 160,923,000 79,447,000 95,997,000 95,851,000 82,004,000 85,256,000 88,032,000 86,826,000 72,393,000 64,883,000 77,037,000 72,403,000 67,604,000 59,498,000 70,502,000 66,058,000 57,047,000 49,400,000 61,593,000 60,244,000 55,106,000 52,236,000 56,256,000 55,310,000 46,818,000 45,894,000 50,656,000 56,024,000 51,515,000 45,269,000 39,152,000 38,058,000 22,909,000 21,773,000 21,474,000 20,555,000 19,383,000 18,452,000 19,536,000 18,982,000 18,173,000 17,705,000 16,843,000 16,846,000 15,511,000       
      yoy
    -0.11% -0.37% 17.68% 10.08% 4.04% 17.75% -3.06% -19.00% -2.58% -18.00% -9.79% 6.38% 9.49% 5.46% 6.34% 11.21% -9.42% 16.29% 9.45% 3.84% -4.90% -10.79% -6.90% -0.34% -5.58% 10.21% -1.58% -8.25% 4.64% -13.70% -12.49% -10.12% -25.38% -7.29% -2.62% -12.49% 22.14% 9.40% 16.54% 128.98% 92.75% 110.29% 96.24% -6.81% 9.05% 10.39% 13.28% 31.40% 14.27% 19.92% 7.08% 9.05% 9.27% 9.61% 18.51% 20.44% 14.46% 9.65% 3.52% -5.43% 9.49% 8.92% 17.70% 13.82% 11.05% -1.27% -9.12% 1.38% 29.38% 47.21% 124.87% 107.91% 82.32% 85.15% 18.19% 18.00% 9.92% 8.29% 6.66% 4.22% 15.99% 12.68% 17.16%           
      qoq
    -22.26% 16.67% 22.38% -10.02% -22.45% 37.81% 14.48% -14.96% -12.24% 13.46% -4.35% 2.28% -26.13% 24.82% 12.80% 5.27% -28.85% 25.86% 17.97% -14.25% -8.66% 18.45% 11.93% -21.48% -14.31% 23.62% 19.81% -25.61% 0.02% 10.39% 11.69% -15.15% -17.51% 11.95% 14.72% -29.56% 2.49% 17.58% 3.09% -1.69% -8.20% 25.25% 102.55% -17.24% 0.15% 16.89% -3.81% -3.15% 1.39% 19.94% 11.57% -15.78% 6.40% 7.10% 13.62% -15.61% 6.73% 15.80% 15.48% -19.80% 2.24% 9.32% 5.49% -7.15% 1.71% 18.14% 2.01% -9.40% -9.58% 8.75% 13.80% 15.62% 2.87% 66.13% 5.22% 1.39% 4.47% 6.05% 5.05% -5.55% 2.92% 4.45% 2.64% 5.12% -0.02% 8.61%        
      gross margin %
    78.36% 81.64% 80.09% 76.75% 77.71% 81.50% 77.99% 74.58% 75.26% 80.00% 78.12% 76.13% 75.52% 78.93% 74.73% 72.36% 75.07% 76.94% 75.63% 71.40% 74.25% 75.83% 71.32% 71.18% 72.65% 74.78% 72.68% 70.57% 75.09% 71.71% 71.41% 69.76% 71.69% 76.01% 71.10% 70.52% 70.87% 72.97% 68.94% 67.64% 64.72% 65.51% 61.63% 78.86% 80.41% 78.03% 79.16% 79.05% 78.38% 78.63% 78.61% 79.31% 78.55% 79.07% 79.96% 77.92% 78.81% 79.30% 78.55% 78.05% 78.99% 78.92% 79.39% 78.18% 78.27% 78.22% 78.43% 79.04% 76.65% 77.76% 74.81% 74.69% 67.87% 70.82% 77.36% 78.01% 78.61% 77.57% 77.28% 78.27% 75.68% 76.20% 76.84% 75.34% 74.43% 76.57% 75.70% 0% 0% 0% NaN% NaN%  
      operating expenses:
                                                                                                 
      research and development
    39,768,000 39,635,000 40,269,000 39,789,000 36,737,000 37,753,000 35,909,000 42,465,000 43,558,000 37,023,000 35,112,000 45,520,000 46,241,000 42,558,000 43,917,000 43,457,000 42,191,000 41,637,000 44,483,000 42,820,000 43,558,000 43,769,000 46,455,000 45,381,000 45,903,000 48,606,000 50,058,000 43,727,000 42,241,000 49,925,000 55,959,000 55,463,000 53,314,000 44,287,000 58,509,000 58,966,000 53,020,000 58,084,000 61,046,000 60,551,000 59,545,000 65,131,000 65,896,000 18,058,000 18,370,000 18,864,000 19,241,000 18,767,000 19,503,000 18,348,000 16,638,000 15,965,000 16,916,000 15,352,000 15,201,000 14,077,000 13,405,000 13,593,000 11,160,000 11,320,000 10,894,000 10,145,000 9,811,000 9,778,000 9,581,000 9,181,000 8,670,000 9,218,000 9,981,000 9,900,000 10,135,000 10,173,000 11,482,000 9,272,000 4,711,000 4,534,000 -13,689,497 4,782,000 4,486,000 4,422,000 4,508,000 4,380,000 4,639,000 4,614,000 4,232,000 4,180,000 4,058,000 4,319,000 4,189,000 3,836,000    
      sales and marketing
    63,626,000 65,392,000 64,925,000 70,595,000 66,562,000 69,933,000 61,226,000 70,330,000 61,909,000 69,124,000 60,950,000 78,996,000 67,478,000 66,994,000 66,118,000 76,323,000 67,000,000 66,048,000 65,185,000 65,958,000 62,062,000 60,934,000 60,300,000 59,434,000 62,278,000 67,653,000 73,067,000 73,525,000 67,663,000 74,024,000 72,051,000 78,132,000 72,639,000 77,270,000 77,266,000 85,361,000 87,122,000 83,212,000 76,706,000 81,588,000 84,704,000 91,386,000 79,153,000 38,092,000 32,142,000 34,836,000 32,196,000 37,272,000 33,427,000 32,425,000 31,559,000 32,200,000 29,810,000 30,105,000 26,743,000 30,149,000 28,480,000 27,518,000 26,854,000 26,772,000 27,439,000 27,022,000 25,691,000 25,119,000 29,253,000 26,328,000 21,372,000 22,106,000 23,801,000 25,219,000 25,739,000 24,059,000 25,835,000 21,463,000 11,436,000 11,541,000 -32,111,392 11,253,000 10,028,000 10,830,000 10,859,000 10,054,000 9,532,000 10,022,000 9,773,000 9,531,000 8,802,000 8,783,000 9,725,000 8,655,000    
      general and administrative
    24,936,000 24,131,000 26,261,000 27,857,000 23,917,000 23,484,000 23,742,000 25,581,000 21,911,000 23,109,000 22,652,000 28,214,000 27,926,000 25,533,000 25,261,000 24,790,000 27,811,000 23,665,000 23,471,000 22,745,000 21,525,000 21,718,000 20,573,000 25,153,000 27,558,000 25,048,000 25,177,000 22,211,000 19,431,000 22,788,000 25,294,000 26,059,000 27,079,000 23,033,000 29,495,000 29,872,000 27,444,000 28,540,000 31,527,000 30,927,000 35,237,000 30,973,000 41,301,000 10,099,000 14,085,000 13,391,000 11,067,000 8,753,000 8,256,000 7,929,000 7,457,000 6,981,000 7,647,000 8,539,000 6,975,000 6,557,000 7,353,000 6,564,000 7,037,000 6,534,000 5,830,000 6,356,000 5,825,000 5,297,000 5,300,000 5,475,000 4,604,000 5,230,000 6,358,000 7,149,000 6,080,000 6,532,000 10,670,000 9,454,000 3,192,000 2,833,000 -6,912,730 2,571,000 2,236,000 2,106,000 2,111,000 2,266,000 2,211,000 2,285,000 2,299,000 2,062,000 1,806,000 1,954,000 1,772,000 1,553,000    
      amortization of acquired intangible assets
    11,165,000 11,156,000 11,162,000 11,119,000 11,583,000 11,601,000 11,642,000 11,614,000 12,547,000 12,533,000 12,550,000 12,707,000 13,890,000 13,818,000 13,801,000 13,881,000 14,846,000 14,919,000 14,970,000 15,006,000 15,234,000 15,273,000 15,363,000 15,261,000 16,110,000 16,120,000 16,132,000 16,143,000 16,426,000 16,433,000 17,981,000 23,465,000 21,738,000 18,221,000 18,298,000 18,383,000 17,495,000 17,515,000 17,559,000 17,572,000 10,472,000 11,249,000 9,843,000 809,000 812,000 821,000 856,000 862,000 861,000 860,000 857,000 854,000 800,000 846,000 645,000 586,000 590,000 565,000 494,000 482,000 477,000 476,000 477,000 477,000 586,000 490,000 491,000 490,000 491,000 490,000 490,000 490,000 491,000 314,000  6,000 29,000 39,000                
      restructuring charges
    25,000 25,000 304,000 529,000 605,000 923,000 2,409,000 16,563,000     -21,000 89,000 -60,000 1,774,000       -31,000 93,000 2,208,000 193,000 150,000 123,000 1,179,000 13,895,000 2,472,000 1,147,000 1,388,000 3,363,000 291,000 167,000 2,271,000 -199,000 -105,000 2,034,000  572,000            -1,000 1,153,000 -87,000 231,000 372,000                                    
      goodwill impairment
           426,967,000 50,154,000 167,106,000                                                                                    
      total operating expenses
    139,520,000 140,339,000 142,921,000 149,889,000 139,404,000 143,694,000 134,928,000 593,520,000 190,079,000 308,895,000 127,458,000 165,437,000 155,514,000 148,992,000 149,037,000 160,225,000 151,848,000 146,269,000 148,109,000 146,529,000 142,379,000 141,694,000 142,660,000 145,322,000 154,057,000 157,620,000 164,584,000 155,729,000 147,235,000 177,065,000 182,934,000 220,137,000 176,158,000 166,174,000 183,859,000 192,749,000 187,352,000 187,152,000 186,733,000 192,672,000 189,958,000 199,311,000 196,193,000 67,058,000 65,409,000 67,912,000 63,360,000 65,654,000 62,047,000 59,562,000 56,511,000 56,000,000 55,173,000 54,841,000 50,717,000 51,282,000 50,059,000 48,612,000 45,545,000 45,108,000 44,640,000 43,999,000 41,804,000 40,671,000 44,720,000 41,474,000 35,137,000 37,044,000 40,631,000 42,758,000 42,444,000 41,254,000 48,478,000 40,503,000 19,339,000 18,914,000 13,207,750 18,645,000 16,789,000 17,397,000 17,517,000 16,739,000 16,421,000 17,183,000 16,304,000 15,773,000 14,666,000 15,056,000 15,686,000 14,044,000    
      income from operations
    19,588,000 64,315,000 32,486,000 -6,564,000 19,886,000 61,713,000 14,123,000 -463,324,000 -36,976,000 -134,447,000 26,292,000 -4,695,000 1,638,000 63,750,000 21,403,000 -9,127,000 -8,319,000 55,455,000 12,165,000 -10,667,000 16,068,000 31,770,000 3,779,000 -14,487,000 12,562,000 36,819,000 -7,295,000 -24,448,000 29,231,000 -641,000 -23,117,000 -77,053,000 -7,525,000 38,261,000 -1,239,000 -33,555,000 38,651,000 33,362,000 805,000 -10,754,000 -4,922,000 2,253,000 -35,270,000 12,389,000 30,588,000 27,939,000 18,644,000 19,602,000 25,985,000 27,264,000 15,882,000 8,883,000 21,864,000 17,562,000 16,887,000 8,216,000 20,443,000 17,446,000 11,502,000 4,292,000 16,953,000 16,245,000 13,302,000 11,565,000 11,536,000 13,836,000 11,681,000 8,850,000 10,025,000 13,266,000 9,071,000 4,015,000 -9,326,000 -2,445,000 3,570,000 2,859,000 1,389,750 1,910,000 2,594,000 1,055,000 2,019,000 2,243,000 1,752,000 522,000 539,000 1,073,000 845,000 323,000 -805,000 318,000    
      yoy
    -1.50% 4.22% 130.02% -98.58% -153.78% -145.90% -46.28% 9768.46% -2357.39% -310.90% 22.84% -48.56% -119.69% 14.96% 75.94% -14.44% -151.77% 74.55% 221.91% -26.37% 27.91% -13.71% -151.80% -40.74% -57.03% -5843.99% -68.44% -68.27% -488.45% -101.68% 1765.78% 129.63% -119.47% 14.68% -253.91% 212.02% -885.27% 1380.78% -102.28% -186.80% -116.09% -91.94% -289.18% -36.80% 17.71% 2.48% 17.39% 120.67% 18.85% 55.24% -5.95% 8.12% 6.95% 0.66% 46.82% 91.43% 20.59% 7.39% -13.53% -62.89% 46.96% 17.41% 13.88% 30.68% 15.07% 4.30% 28.77% 120.42% -207.50% -642.58% 154.09% 40.43% -771.06% -228.01% 37.63% 171.00% -31.17% -14.85% 48.06% 102.11% 274.58% 109.04% 107.34% 61.61% -166.96% 237.42%        
      qoq
    -69.54% 97.98% -594.91% -133.01% -67.78% 336.97% -103.05% 1153.04% -72.50% -611.36% -660.00% -386.63% -97.43% 197.86% -334.50% 9.71% -115.00% 355.86% -214.04% -166.39% -49.42% 740.70% -126.09% -215.32% -65.88% -604.72% -70.16% -183.64% -4660.22% -97.23% -70.00% 923.96% -119.67% -3188.05% -96.31% -186.82% 15.85% 4044.35% -107.49% 118.49% -318.46% -106.39% -384.69% -59.50% 9.48% 49.86% -4.89% -24.56% -4.69% 71.67% 78.79% -59.37% 24.50% 4.00% 105.54% -59.81% 17.18% 51.68% 167.99% -74.68% 4.36% 22.12% 15.02% 0.25% -16.62% 18.45% 31.99% -11.72% -24.43% 46.25% 125.93% -143.05% 281.43% -168.49% 24.87% 105.72% -27.24% -26.37% 145.88% -47.75% -9.99% 28.03% 235.63% -3.15% -49.77% 26.98% 161.61% -140.12% -353.14%     
      operating margin %
    9.65% 25.66% 14.83% -3.51% 9.70% 24.49% 7.39% -265.42% -18.18% -61.65% 13.36% -2.22% 0.79% 23.65% 9.38% -4.37% -4.35% 21.15% 5.74% -5.61% 7.53% 13.89% 1.84% -7.88% 5.48% 14.16% -3.37% -13.14% 12.44% -0.26% -10.33% -37.57% -3.20% 14.23% -0.48% -14.86% 12.12% 11.04% 0.30% -4.00% -1.72% 0.73% -13.51% 12.30% 25.62% 22.75% 18.00% 18.17% 23.14% 24.69% 17.24% 10.86% 22.29% 19.18% 19.97% 10.76% 22.85% 20.94% 15.84% 6.78% 21.74% 21.28% 19.16% 17.31% 16.05% 19.57% 19.57% 15.24% 15.17% 18.41% 13.17% 6.62% -16.17% -4.55% 12.06% 10.24% 5.09% 7.21% 10.34% 4.48% 7.82% 9.00% 7.41% 2.22% 2.38% 4.88% 4.12% 1.61% -4.12% 1.68% NaN% NaN%  
      interest and other income, net:
                                                                                                 
      interest income
    3,813,000 3,277,000 3,530,000 3,211,000 2,559,000 2,533,000 2,546,000 3,098,000 2,660,000 2,145,000 2,509,000 2,288,000 2,411,000 1,480,000 756,000 276,000 143,000 45,000 45,000 63,000 136,000 73,000 171,000 265,000 829,000 826,000 1,214,000 1,658,000 1,557,000 1,455,000 1,293,000 941,000 612,000 307,000 410,000 480,000 394,000 207,000 229,000 191,000 172,000 189,000 172,000 158,000 147,000 95,000 98,000 104,000 99,000 66,000 57,000 87,000 85,000 115,000 192,000 116,000 115,000 104,000 101,000 99,000 85,000 210,000 199,000 178,000 117,000 109,000 141,000 277,000 290,000 473,000 606,000 662,000 840,000 866,000 1,089,000 1,018,000                  
      interest expense
    -413,000 -456,000 -421,000 -415,000 -765,000 -2,649,000 -1,801,000 -1,945,000 -2,176,000 -2,208,000 -2,174,000 -2,093,000 -3,227,000 -2,914,000 -2,242,000 -1,864,000 -1,734,000 -1,748,000 -2,411,000 -2,154,000 -2,382,000 -2,708,000 -2,715,000 -3,074,000 -4,430,000 -4,629,000 -5,173,000 -6,365,000 -6,823,000 -7,005,000 -6,427,000 -5,888,000 -4,719,000 -2,798,000 -2,565,000 -2,550,000 -2,401,000 -2,260,000 -2,193,000 -2,331,000 -2,282,000 -2,070,000 -1,786,000 -192,000 -193,000 -191,000 -196,000 -194,000 -193,000 -198,000 -187,000 -190,000 -206,000 -293,000 -401,000 -296,000 -317,000 -472,000 -477,000 -500,000 -573,000 -599,000 -658,000 -622,000 -636,000 -873,000 -868,000 -1,087,000 -1,153,000 -1,560,000 -1,573,000 -2,001,000 -2,033,000 -1,955,000 -22,000 -9,000                  
      other income
    358,000 -528,000 -4,213,000 940,000 -3,479,000 -4,222,000 -2,542,000 8,475,000 3,560,000 792,000 847,000 -834,000 -1,879,000 -1,738,000 -538,000 230,000 428,000 1,880,000 30,000  -823,000 -948,000 -850,000 -1,971,000 -183,000 -112,000 343,000 308,000 107,250 986,000  254,000           786,000  -576,000 -416,000 -445,000 -41,000 24,000 176,000  30,000 21,500 74,000 93,000 -176,000   -459,000 2,000 -500 -3,000 -3,000 4,000 1,250 -98,000 12,000 91,000    -413,000                      
      total interest and other income
    3,758,000 2,293,000 -1,104,000 3,736,000 -1,685,000 -4,338,000 -1,797,000 9,628,000 4,044,000 729,000 1,182,000  -1,638,500 -3,172,000   -1,144,750 177,000                           -296,500 -512,000 -543,000 -131,000 -22,000 44,000  -73,000    -356,000   -835,000 -399,000 -478,000 -392,000 -462,000 -440,000 -536,000 -862,000 -715,000 -719,000 -889,000 -1,267,000 -1,428,000 -1,752,000 -1,934,000 -1,343,000  1,009,000                  
      income before income tax expense
    23,346,000 66,608,000 31,382,000  18,201,000 57,375,000 12,326,000  -32,932,000 -133,718,000 27,474,000  -1,057,000 60,578,000 19,379,000  -9,482,000 55,632,000 9,829,000  12,999,000 28,187,000 385,000  8,778,000 32,904,000       -12,561,000 35,154,000   36,854,000 30,614,000  -13,658,000 -7,934,000 -650,000 -36,098,000 12,243,000 29,966,000 27,427,000 18,101,000 19,471,000 25,915,000 27,308,000 15,823,000 8,810,000 21,647,000 17,458,000 16,771,000 7,860,000 20,120,000 16,238,000 10,667,000 3,893,000 16,475,000 15,853,000 12,840,000 11,125,000 11,000,000 12,974,000 10,966,000 8,131,000   7,643,000 2,263,000         2,876,000 2,930,000 2,321,000 1,036,000 934,000 1,419,000 964,000 502,000 -94,250 485,000    
      income tax expense
    5,106,000 11,466,000 5,554,000 851,000 -416,000 8,565,000 3,299,000  -513,000 -1,141,000 6,012,000  2,164,000 7,960,000 1,996,000  -1,076,000 7,907,000 1,933,000  1,562,000 -834,000 4,071,000 -1,847,000 1,442,000 -3,821,000 6,561,000 496,000     -29,378,000 -54,531,000   14,544,000 9,369,000  -4,660,000 -4,318,000 23,857,000 -28,183,000 4,574,000 9,112,000 9,798,000 6,868,000 7,995,000 9,239,000 10,014,000 5,940,000 3,557,000 7,094,000 6,320,000 6,861,000 2,852,000 7,173,000 6,207,000 3,616,000 1,494,000 5,704,000 4,752,000 4,592,000 3,980,000 3,947,000 4,433,000 3,880,000 2,894,000 3,462,000 4,064,000 2,701,000 766,000 -6,347,000 -682,000 1,380,000 1,188,000 625,000 844,000 1,364,000 766,000 1,072,000 1,043,000 867,000 384,000 324,000 513,000 -93,000 205,000 -2,250 301,000    
      net income
    18,240,000 55,142,000 25,828,000 -3,679,000 18,617,000 48,810,000 9,027,000 -443,376,000 -32,419,000 -132,577,000 21,462,000 -4,200,000 -3,221,000 52,618,000 17,383,000 -7,132,000 -8,406,000 47,725,000 7,896,000 -11,341,000 11,437,000 29,021,000 -3,686,000 -17,420,000 7,336,000 36,725,000 -17,472,000 -29,343,000 19,211,000 -3,603,000 -26,428,000 -62,504,000 16,817,000 89,685,000 -2,468,000 -24,222,000 22,310,000 21,245,000 -1,266,000 -8,998,000 -3,616,000 -24,507,000 -7,915,000 7,669,000 20,854,000 17,629,000 11,233,000 11,476,000 16,676,000 17,294,000 9,883,000 5,253,000 14,553,000 11,138,000 9,910,000 5,008,000 12,947,000 10,031,000 7,051,000 2,399,000 10,771,000 11,101,000 8,248,000 7,145,000 7,053,000 8,541,000 7,086,000 5,237,000 5,674,000 7,935,000 4,942,000 1,497,000 -4,913,000 -3,106,000 3,251,000 2,680,000 1,414,750 1,983,000 2,302,000 1,374,000 1,804,000 1,887,000 1,454,000 652,000 610,000 906,000 1,057,000 297,000 -177,000 184,000    
      yoy
    -2.03% 12.97% 186.12% -99.17% -157.43% -136.82% -57.94% 10456.57% 906.49% -351.96% 23.47% -41.11% -61.68% 10.25% 120.15% -37.11% -173.50% 64.45% -314.22% -34.90% 55.90% -20.98% -78.90% -40.63% -61.81% -1119.29% -33.89% -53.05% 14.24% -104.02% 970.83% 158.05% -24.62% 322.15% 94.94% 169.19% -716.98% -186.69% -84.01% -217.33% -117.34% -239.02% -170.46% -33.17% 25.05% 1.94% 13.66% 118.47% 14.59% 55.27% -0.27% 4.89% 12.40% 11.04% 40.55% 108.75% 20.20% -9.64% -14.51% -66.42% 52.72% 29.97% 16.40% 36.43% 24.30% 7.64% 43.38% 249.83% -215.49% -355.47% 52.01% -44.14% -447.27% -256.63% 41.23% 95.05% -21.58% 5.09% 58.32% 110.74% 195.74% 108.28% 37.56% 119.53% -444.63% 392.39%        
      qoq
    -66.92% 113.50% -802.04% -119.76% -61.86% 440.71% -102.04% 1267.64% -75.55% -717.73% -611.00% 30.39% -106.12% 202.70% -343.73% -15.16% -117.61% 504.42% -169.62% -199.16% -60.59% -887.33% -78.84% -337.46% -80.02% -310.19% -40.46% -252.74% -633.19% -86.37% -57.72% -471.67% -81.25% -3733.91% -89.81% -208.57% 5.01% -1778.12% -85.93% 148.84% -85.25% 209.63% -203.21% -63.23% 18.29% 56.94% -2.12% -31.18% -3.57% 74.99% 88.14% -63.90% 30.66% 12.39% 97.88% -61.32% 29.07% 42.26% 193.91% -77.73% -2.97% 34.59% 15.44% 1.30% -17.42% 20.53% 35.31% -7.70% -28.49% 60.56% 230.13% -130.47% 58.18% -195.54% 21.31% 89.43% -28.66% -13.86% 67.54% -23.84% -4.40% 29.78% 123.01% 6.89% -32.67% -14.29% 255.89% -267.80% -196.20%     
      net income margin %
    8.98% 22.00% 11.79% -1.97% 9.08% 19.37% 4.72% -253.99% -15.94% -60.80% 10.91% -1.99% -1.55% 19.52% 7.62% -3.42% -4.40% 18.20% 3.73% -5.96% 5.36% 12.69% -1.80% -9.48% 3.20% 14.12% -8.07% -15.77% 8.17% -1.46% -11.81% -30.47% 7.15% 33.35% -0.96% -10.73% 7.00% 7.03% -0.47% -3.35% -1.26% -7.97% -3.03% 7.61% 17.47% 14.35% 10.84% 10.64% 14.85% 15.66% 10.73% 6.42% 14.84% 12.16% 11.72% 6.56% 14.47% 12.04% 9.71% 3.79% 13.81% 14.54% 11.88% 10.69% 9.81% 12.08% 11.87% 9.02% 8.59% 11.01% 7.18% 2.47% -8.52% -5.78% 10.98% 9.60% 5.18% 7.48% 9.18% 5.83% 6.99% 7.57% 6.15% 2.77% 2.70% 4.12% 5.16% 1.48% -0.91% 0.97% NaN% NaN%  
      basic net income per share
    0.26 0.76 0.36  0.27 0.68 0.13  -0.46 -1.87 0.3  -0.04 0.73 0.24  -0.12 0.65 0.11  0.15 0.39   0.09 0.49   0.24 -0.05   0.2 1.03   0.24 0.23  -0.1 -0.03 -0.25 -0.09 0.19 0.51 0.43 0.27 0.28 0.41 0.42 0.24 0.13 0.35 0.27 0.24 0.12 0.31 0.24 0.17 0.06 0.26 0.26 0.2 0.17 0.17 0.21 0.18 0.13    0.04 -0.14 -0.09 0.1 0.08 31,712.82 0.06 0.07 0.04 0.06 0.06 0.05 0.02 0.02 0.03 0.03 0.01 -0.003 0.01    
      diluted net income per share
    0.24 0.75 0.35  0.27 0.67 0.13  -0.46 -1.87 0.29  -0.04 0.72 0.24  -0.11 0.64 0.11  0.15 0.39   0.09 0.49   0.24 -0.05   0.2 1.02   0.24 0.23  -0.1 -0.03 -0.25 -0.09 0.19 0.5 0.42 0.27 0.27 0.4 0.41 0.24 0.12 0.34 0.26 0.23 0.12 0.3 0.24 0.17 0.06 0.25 0.26 0.19 0.17 0.17 0.2 0.17 0.13    0.04 -0.14 -0.09 0.1 0.08 0.043 0.06 0.07 0.04 0.05 0.06 0.05 0.02 0.02 0.03 0.03 0.01 -0.003 0.01    
      weighted-average common shares outstanding used in computing:
                                                                                                 
      net income per share
    -23 72,211 72,077 71,729 76 71,737 71,447 71,467 -103 71,077 72,112 71,540 -234 71,744 71,856 72,452 -29 73,898 74,382 73,859 150 73,492 73,058 72,303 -618 74,367 75,687 77,302 -299 77,774 78,631 80,358 -1,560 87,210 88,589 91,180 -111 91,762 91,919 93,344 4,801 98,797 91,410 40,776 -23 41,206 41,060 41,081 -51 41,425 41,392 41,405 -50 41,709 41,695 41,742 -91 41,523 42,258 42,608 113 42,105 41,922 41,812 228 40,684 40,395 40,309                          
      loss before income tax expense
       -2,828,000                    -19,267,000   -10,911,000 -28,847,000       -4,562,000 -36,690,000                                                          
      basic net loss per share
       -0.05    -6.2    -0.06    -0.1    -0.15   -0.05 -0.24   -0.23 -0.38   -0.34 -0.78   -0.03 -0.27   -0.01                                                       
      diluted net loss per share
       -0.05    -6.2    -0.06    -0.1    -0.15   -0.05 -0.24   -0.23 -0.38   -0.34 -0.78   -0.03 -0.27   -0.01                                                       
      gain on divestiture of a business
              -3,806,000                                                                                   
      loss before income tax benefit
           -453,696,000    -5,334,000    -10,485,000    -13,087,000           -29,063,000 -81,746,000       -1,625,000                                                       
      income tax benefit
           -10,320,000    -1,134,000    -3,353,000    -1,746,000         -5,869,750 -1,602,000 -2,635,000 -19,242,000   -2,094,000 -12,468,000   -359,000                                                       
      interest and other expense, net:
                                                                                                 
      total interest and other expense
               -639,000   -2,024,000 -1,358,000   -2,336,000 -2,420,000 -3,069,000 -3,583,000 -3,394,000 -4,780,000 -3,784,000 -3,915,000 -3,616,000 -4,399,000 -6,129,000 -4,564,000 -5,946,000 -4,693,000 -5,036,000 -3,107,000 -3,323,000 -3,135,000 -1,797,000 -2,748,000 -2,430,000 -2,904,000 -3,012,000 -2,903,000 -828,000 -146,000         -217,000 -104,000 -116,000  -323,000 -1,208,000                                    
      other expense
                       -329,000           -812,000  -711,750 -616,000 -1,168,000 -1,065,000    -764,000 -87,250 -1,022,000  -112,000             -121,000 -150,000           -26,000 -180,000 -461,000  -65,000 -254,000 -6,000                   
      impairment of intangible assets
                                   35,871,000                                                              
      loss on divestiture of business
                                295,000  9,177,000                                                               
      income before income tax benefit
                                -29,003,500 -5,205,000                                                                
      other expense,
                                        -481,500 -695,000                                                        
      other income,
                                          -466,000                                                       
      other income expense
                                                      71,000                                           
      total interest and other expense income
                                                      -59,000                                           
      loss on extinguishment of debt
                                                             -690,000                                    
      share-based compensation expenses included in these amounts are as follows:
                                                                                                 
      cost of product revenue
                                                                      29 28 39 27 26 26 34 10 11 11 10 10               
      cost of service revenue
                                                                      56 56 66 57 55 40 36 15 14 12 14 12 12               
      total share-based compensation expense, before income tax effect
                                                                      1,284 1,283    1,191   326 385 396 357 333               
      income before income taxes
                                                                        5,476,250 11,999,000                        
      basic net income per share attributable to common shareholders
                                                                        0.093 0.2 0.13                       
      diluted net income per share attributable to common shareholders
                                                                        0.088 0.2 0.12                       
      weighted-average shares outstanding—basic
                                                                         39,334 39,201   36,495                    
      weighted-average shares outstanding—diluted
                                                                         40,506 41,008   36,495                    
      share-based compensation expenses included in these amounts are as follows: - sum
                                                                        900.25 1,222 1,188                       
      weighted-average common shares outstanding—basic
                                                                           38,954                      
      weighted-average common shares outstanding—diluted
                                                                           40,504                      
      income before income tax expense and cumulative effect of accounting change
                                                                            -11,260,000 -3,788,000 4,631,000 3,868,000 2,703,000 2,827,000 3,666,000 2,070,000              
      income before cumulative effect of accounting change
                                                                            -4,913,000 -3,106,000 3,251,000 2,680,000 2,078,000 1,983,000 2,302,000 1,304,000              
      cumulative effect of accounting change, net of taxes of 42
                                                                                                 
      __________ share-based compensation expenses included in these amounts are as follows:
                                                                                                 
      interest income and other expense, net:
                                                                                                 
      total interest income and other expense
                                                                              1,061,000                   
      cumulative effect of accounting change, net of taxes of 41
                                                                                   70,000              
      shares used in computing:
                                                                                                 
      license and royalty
                                                                                       184,000 452,000 415,000 439,000 432,000 466,000 432,000    
      in-process research and development
                                                                                       143,000          
      interest and other income
                                                                                751,000 917,000                
      amortization of other intangible assets
                                                                                  39,000 39,000 39,000 39,000 39,000 119,000          
      interest income and other expenses
                                                                                  1,072,000 1,015,000 442,500 687,000 569,000 514,000 161,000 346,000 119,000 179,000 131,000 167,000    
      share-based compensation expense included in these amounts is as follows:
                                                                                                 
      gross margin
                                                                                           15,379,000 14,881,000 14,362,000    
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 2003-12-31 2002-03-31 
                                                                                                 
        assets
                                                                                                 
        current assets:
                                                                                                 
        cash and cash equivalents
      586,499,000 540,642,000 483,380,000 489,572,000 457,415,000 398,361,000 363,355,000 362,213,000 389,674,000 297,655,000 279,944,000 332,716,000 386,794,000 352,044,000 320,325,000 332,502,000 636,161,000 548,105,000 468,470,000 487,168,000 467,176,000 477,755,000 415,719,000 403,306,000 338,489,000 287,660,000 245,064,000 353,721,000 409,632,000 369,054,000 332,183,000 353,416,000 369,821,000 331,912,000 251,505,000 261,736,000 304,880,000 244,833,000 195,423,000 210,870,000 210,711,000 230,521,000 215,539,000 94,352,000 104,893,000 106,704,000 78,986,000 88,974,000 102,076,000 88,648,000 94,917,000 102,727,000 99,930,000 90,836,000 160,386,000 135,025,000 117,255,000 102,762,000 103,859,000 39,473,000 67,168,000 121,482,000 114,043,000 98,063,000 63,322,000 66,524,000 84,698,000 75,733,000 82,222,000 63,204,000 64,810,000 68,708,000 56,702,000 52,497,000 31,923,000 12,650,000  70,151,000 56,108,000 51,999,000 61,676,000 56,278,000 32,706,000 33,498,000 57,070,000 33,500,000 37,870,000 30,092,000 19,011,000 23,154,000  
        marketable securities
      81,458,000            32,204,000 57,262,000 46,806,000 42,144,000 67,037,000 5,349,000 7,347,000 6,737,000 9,277,000 12,689,000 12,127,000 23,202,000 47,969,000 56,274,000 55,129,000 84,354,000 76,344,000 105,753,000 119,935,000 105,637,000 77,941,000 47,895,000 55,582,000 138,719,000 137,892,000 114,870,000 99,297,000 108,743,000 128,003,000 127,751,000 103,138,000 112,857,000 101,392,000 87,967,000 90,783,000 88,890,000 75,234,000 56,343,000 42,094,000 46,333,000 37,338,000 35,324,000 69,604,000 74,517,000 79,617,000 61,167,000 68,520,000 142,319,000 133,430,000 64,407,000 53,261,000 63,513,000 69,875,000 49,412,000 29,232,000 37,032,000 24,162,000 25,353,000 13,053,000 8,556,000 10,465,000 29,237,000 70,856,000 80,530,000  14,130,000 31,247,000 32,761,000 19,810,000 18,043,000 38,796,000 43,786,000 26,793,000 39,842,000 34,416,000 40,443,000 50,432,000 38,028,000  
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 129 and 214 at march 31, 2026 and 2025, respectively
      151,473,000                                                                                           
        inventories and deferred costs
      13,321,000 12,409,000 12,381,000 13,047,000 12,891,000 14,414,000 16,388,000 14,994,000 14,095,000 15,342,000 15,909,000 18,449,000 17,956,000 18,621,000 24,063,000 22,840,000 28,220,000 21,500,000 25,728,000 20,841,000 22,813,000 26,040,000 26,223,000 27,300,000 22,227,000 24,977,000 26,195,000 26,479,000 26,270,000 28,909,000 30,985,000 32,739,000 34,774,000 36,592,000 36,956,000 41,013,000 40,002,000 54,151,000 52,860,000 58,842,000                                                    
        prepaid income taxes
      6,159,000 7,922,000 14,660,000 14,800,000 13,380,000 8,800,000 15,391,000 13,352,000 11,076,000 14,946,000 13,619,000 10,834,000 2,235,000 8,780,000 30,420,000 21,271,000 9,349,000 4,355,000 11,526,000 11,534,000 1,906,000 9,566,000 8,998,000 12,392,000 13,505,000 14,454,000 13,109,000 19,614,000 18,000,000 23,826,000 25,143,000 28,544,000 22,932,000 23,483,000 48,563,000 48,523,000 40,346,000 18,913,000 34,435,000 28,402,000 18,137,000 37,795,000 40,694,000  1,393,000 2,864,000 6,742,000 1,207,000 1,012,000  1,920,000 1,523,000  8,917,000 8,282,000 4,939,000 4,600,000 4,413,000 3,563,000 5,376,000 3,205,000  2,386,000 442,000 2,730,000 6,788,000 6,764,000                         
        prepaid expenses and other current assets
      28,972,000 28,961,000 33,969,000 31,359,000 31,786,000 27,461,000 32,435,000 26,267,000 32,094,000 28,344,000 29,794,000 27,493,000 34,316,000 29,402,000 27,649,000 31,749,000 32,927,000 26,425,000 25,629,000 23,777,000 23,583,000 28,548,000 36,654,000 25,782,000 24,039,000 25,807,000 31,209,000 31,643,000 35,658,000 27,001,000 27,429,000 32,407,000 33,502,000 23,686,000 29,043,000 29,026,000 36,972,000 28,808,000 42,444,000 65,855,000 78,399,000 49,421,000 72,218,000 8,425,000 13,495,000 9,846,000 9,052,000 9,328,000 11,496,000 8,800,000 8,292,000 7,215,000 9,043,000 9,465,000 6,645,000 5,588,000 6,162,000 5,692,000 4,542,000 4,765,000 4,814,000 4,800,000 4,684,000 4,418,000 5,422,000 4,667,000 4,675,000 5,108,000 4,939,000 5,673,000 5,132,000 6,804,000 13,546,000 12,008,000 2,845,000 3,401,000  3,285,000 2,198,000 2,953,000  2,225,000          
        total current assets
      867,882,000 856,849,000 708,031,000 683,915,000 713,184,000 692,157,000 583,713,000 590,050,000 672,494,000 609,318,000 540,521,000 549,671,000 617,360,000 681,947,000 588,389,000 563,395,000 921,939,000 839,588,000 701,588,000 696,256,000 722,472,000 762,614,000 669,408,000 630,775,000 659,743,000 654,049,000 572,994,000 675,850,000 801,222,000 802,233,000 719,831,000 718,074,000 752,408,000 713,507,000 636,876,000 704,898,000 854,466,000 745,630,000 665,058,000 668,939,000 740,478,000 753,872,000 697,543,000 307,893,000 337,284,000 315,244,000 264,226,000 246,794,000 278,762,000 248,601,000 223,057,000 229,241,000 237,312,000 219,541,000 286,283,000 270,708,000 289,687,000 236,665,000 242,709,000 246,264,000 283,726,000 259,043,000 229,817,000 219,531,000 218,784,000 196,666,000 168,738,000 163,595,000 169,185,000 158,172,000 127,100,000 134,705,000 135,932,000 157,354,000 132,235,000 120,370,000  111,669,000 114,814,000 111,501,000 109,406,000 104,727,000 94,055,000 98,306,000 105,621,000 95,426,000 90,755,000 91,183,000 89,604,000 79,280,000  
        fixed assets
      23,558,000 21,922,000 21,290,000 21,494,000 21,529,000 22,054,000 23,244,000 24,903,000 26,487,000 27,955,000 30,637,000 33,207,000 34,735,000 37,590,000 38,752,000 40,328,000 41,337,000 42,723,000 45,008,000 46,973,000 48,474,000 51,265,000 53,168,000 55,228,000 57,715,000 58,700,000 58,505,000 56,393,000 58,951,000 60,789,000 63,617,000 60,006,000 52,511,000 53,646,000 57,413,000 60,269,000 61,393,000 61,900,000 64,003,000 64,058,000 62,033,000 58,663,000 60,398,000 24,902,000 23,864,000 23,016,000 21,721,000 22,742,000 23,098,000 21,350,000 21,797,000 20,565,000 19,678,000 18,077,000 16,505,000 17,029,000 16,457,000 15,213,000 15,431,000 14,629,000 13,467,000 12,359,000 12,774,000 12,848,000 12,773,000 11,604,000 12,434,000 13,279,000 13,848,000 13,965,000 15,104,000 15,747,000 16,729,000 17,563,000 8,869,000 8,868,000  8,069,000 8,217,000 7,757,000 7,577,000 7,415,000 6,880,000 6,407,000 6,011,000 6,252,000 5,810,000 5,686,000 5,415,000 5,844,000  
        operating lease right-of-use assets
      35,553,000 37,574,000 38,388,000 36,226,000 37,717,000 36,582,000 38,498,000 39,911,000 42,486,000 44,977,000 47,000,000 49,432,000 51,456,000 51,096,000 49,757,000 52,473,000 54,996,000 56,268,000 56,715,000 58,899,000 61,512,000 63,257,000 65,562,000 68,025,000 68,583,000 65,738,000 65,118,000 67,536,000                                                                
        goodwill
      1,070,592,000 1,069,028,000 1,069,517,000 1,070,155,000 1,076,383,000 1,079,111,000 1,073,355,000 1,076,715,000 1,502,820,000 1,551,541,000 1,722,004,000 1,723,536,000 1,724,404,000 1,725,729,000 1,733,342,000 1,726,200,000 1,723,156,000 1,720,713,000 1,717,870,000 1,716,092,000 1,717,554,000 1,714,109,000 1,718,595,000 1,721,649,000 1,725,680,000 1,718,496,000 1,719,362,000 1,717,945,000 1,715,485,000 1,715,523,000 1,712,962,000 1,718,499,000 1,712,764,000 1,716,371,000 1,715,861,000 1,715,512,000 1,718,162,000 1,720,911,000 1,714,539,000 1,710,286,000 1,709,369,000 1,693,876,000 1,702,705,000 198,222,000 197,445,000 200,271,000 201,457,000 203,034,000 203,446,000 203,201,000 202,863,000 202,582,000 202,453,000 203,251,000 181,299,000 169,522,000 170,384,000 169,952,000 141,356,000 141,356,000 128,177,000 128,177,000 128,177,000 128,177,000 128,177,000 128,177,000 128,177,000 128,177,000 128,177,000 131,754,000 131,754,000 131,802,000 131,802,000 135,295,000 36,561,000 36,561,000 36,561,000 36,561,000 36,561,000 36,561,000 36,561,000 36,561,000 36,561,000 36,533,000 28,839,000 28,839,000 28,839,000 28,839,000 28,839,000 28,839,000  
        intangible assets
      214,295,000 226,787,000 238,389,000 249,902,000 258,690,000 270,027,000 285,605,000 295,290,000 308,659,000 323,899,000 336,445,000 352,497,000 366,591,000 382,257,000 393,650,000 414,950,000 433,419,000 453,719,000 474,448,000 494,412,000 511,866,000 535,095,000 551,783,000 569,477,000 582,179,000 602,856,000 624,799,000 648,997,000 669,118,000 693,763,000 720,949,000 756,418,000 831,374,000 859,160,000 887,974,000 906,345,000 931,269,000 959,042,000 998,169,000 1,023,968,000 1,054,040,000 1,075,532,000 1,102,717,000 48,815,000 50,180,000 52,469,000 54,465,000 56,643,000 58,513,000 59,827,000 60,896,000 62,317,000 63,827,000 65,433,000 56,066,000 52,452,000 54,685,000 56,390,000 48,939,000 50,500,000                                
        deferred income taxes
      93,735,000 85,054,000 78,845,000 72,689,000 66,294,000 62,519,000 54,978,000 47,855,000 30,767,000 19,518,000 4,468,000 4,610,000 4,534,000 6,693,000 6,232,000 6,646,000 6,883,000 7,817,000 8,064,000 8,201,000 8,096,000 6,982,000 6,690,000 6,491,000 6,220,000 7,034,000 7,006,000 7,110,000 7,218,000 4,776,000 5,640,000 5,575,000 6,685,000 5,725,000 5,590,000 5,477,000 6,580,000 2,485,000 3,263,000 5,040,000   29,796,000 21,053,000 21,755,000 14,174,000 14,372,000 14,414,000 15,846,000 9,419,000 9,434,000 9,581,000 9,538,000 5,664,000 4,128,000 4,336,000 4,237,000 3,624,000 3,585,000 3,379,000 3,383,000 2,614,000 2,583,000 2,813,000 2,698,000 2,897,000 2,796,000 2,796,000 2,796,000 4,257,000 5,191,000 5,985,000 6,052,000 3,620,000 2,747,000 2,679,000  2,909,000 2,827,000 2,837,000 2,896,000 2,406,000 2,318,000 2,361,000 2,356,000 2,082,000 1,750,000 1,687,000 1,667,000 1,667,000  
        long-term marketable securities
      37,188,000 13,151,000 10,042,000 10,997,000 1,004,000 1,015,000 1,009,000 1,003,000 994,000 1,010,000 3,959,000 5,881,000 8,940,000 6,906,000           2,613,000 2,561,000 7,630,000 5,087,000 1,012,000 1,002,000    3,187,000 6,292,000 9,195,000 21,933,000 17,206,000 8,675,000 15,309,000 13,361,000 17,961,000 32,708,000 60,303,000 58,572,000 46,055,000 47,542,000 56,580,000 41,484,000 37,222,000 22,438,000 13,762,000 16,823,000 10,540,000 5,615,000 29,690,000 16,644,000 28,360,000 26,528,000 27,442,000 27,880,000 24,341,000 28,702,000 29,415,000 37,354,000 35,349,000 28,856,000 28,798,000 29,528,000 30,658,000 31,487,000 32,522,000 33,764,000  6,094,000 12,035,000  10,813,000 3,315,000 6,030,000 5,979,000 3,022,000 6,007,000   5,972,000 5,962,000 5,968,000 6,016,000 12,528,000  
        other assets
      11,714,000 11,232,000 11,682,000 12,048,000 11,777,000 11,280,000 10,270,000 9,689,000 10,595,000 11,581,000 12,677,000 11,763,000 12,540,000 11,894,000 11,931,000 12,643,000 12,979,000 12,721,000 12,705,000 12,221,000 15,064,000 13,001,000 12,345,000 15,882,000 17,770,000 17,905,000 13,960,000 15,083,000 16,988,000 19,298,000 20,006,000 19,036,000 12,866,000 7,423,000 7,919,000 8,134,000 7,710,000 5,723,000 6,078,000 6,858,000 7,356,000 7,775,000 7,588,000 1,617,000 1,704,000 1,873,000 2,130,000 2,344,000 2,460,000 2,047,000 2,285,000 2,439,000 2,872,000 3,523,000 2,095,000 1,840,000 2,008,000 2,463,000 1,244,000 1,359,000 1,467,000 1,660,000 1,811,000 1,850,000 1,878,000 1,813,000 1,668,000 1,260,000 1,445,000 1,542,000 723,000 787,000 1,166,000 991,000 1,692,000 100,000  71,000 29,000 13,000 16,000 19,000 9,000 12,000 9,000 18,000 39,000 36,000 45,000   
        total assets
      2,354,517,000 2,321,597,000 2,176,184,000 2,157,426,000 2,186,578,000 2,174,745,000 2,070,672,000 2,085,416,000 2,595,302,000 2,589,799,000 2,697,711,000 2,730,597,000 2,820,560,000 2,904,112,000 2,822,053,000 2,816,635,000 3,194,709,000 3,133,549,000 3,016,398,000 3,033,054,000 3,085,038,000 3,146,323,000 3,077,551,000 3,067,527,000 3,120,503,000 3,127,339,000 3,069,374,000 3,194,001,000 3,269,994,000 3,297,384,000 3,243,005,000 3,277,608,000 3,368,608,000 3,359,019,000 3,317,925,000 3,409,830,000 3,601,513,000 3,512,897,000 3,459,785,000 3,494,458,000 3,592,843,000 3,635,114,000 3,604,071,000 641,752,000 669,049,000 638,928,000 591,541,000 588,137,000 607,763,000 577,877,000 541,401,000 539,657,000 552,176,000 532,120,000 561,771,000 556,626,000 567,757,000 530,892,000 500,151,000 506,470,000 527,570,000 504,408,000 479,170,000 472,446,000 482,601,000 461,476,000 429,518,000 427,415,000 436,734,000 432,998,000 404,591,000 415,533,000 420,937,000 410,790,000 191,228,000 183,785,000 180,419,000 173,030,000 168,557,000 167,830,000 165,755,000 158,731,000 152,788,000 151,377,000 148,287,000 144,900,000 140,602,000 140,638,000 139,181,000 135,126,000  
        liabilities and stockholders’ equity
                                                                                                 
        current liabilities:
                                                                                                 
        accounts payable
      23,492,000 17,247,000 14,706,000 14,016,000 18,208,000 13,693,000 13,911,000 15,938,000 14,506,000 15,132,000 15,569,000 14,400,000 16,473,000 15,451,000 21,474,000 19,848,000 21,959,000 18,436,000 17,644,000 16,961,000 17,964,000 19,219,000 18,083,000 17,288,000 20,004,000 19,756,000 34,855,000 25,578,000 24,582,000 29,432,000 22,102,000 25,122,000 30,133,000 32,469,000 30,128,000 30,551,000 37,407,000 41,660,000 45,853,000 45,607,000 43,969,000 52,660,000 37,425,000 11,203,000 13,077,000 10,927,000 10,193,000 9,888,000 11,541,000 8,679,000 8,719,000 12,130,000 10,161,000 9,151,000 8,344,000 8,106,000 7,539,000 6,585,000 7,845,000 6,579,000 9,709,000 5,521,000 6,415,000 8,521,000 7,307,000 8,484,000 8,118,000 6,946,000 6,385,000 6,688,000 7,326,000 7,319,000 9,207,000 14,027,000 4,507,000 2,973,000  2,799,000 4,070,000 2,469,000 2,727,000 2,818,000 3,481,000 2,524,000 2,520,000 2,674,000 1,863,000 2,435,000 1,984,000 1,915,000  
        accrued compensation
      84,515,000 74,156,000 53,461,000 46,978,000 56,696,000 54,657,000 41,485,000 63,059,000 51,362,000 42,283,000 36,935,000 53,627,000 83,279,000 72,259,000 55,385,000 51,000,000 75,788,000 67,332,000 57,783,000 53,292,000 83,057,000 76,900,000 61,842,000 53,688,000 75,632,000 70,430,000 50,202,000 41,379,000 58,501,000 71,612,000 54,258,000 55,331,000 46,552,000 54,010,000 62,776,000 61,242,000 77,607,000 83,459,000 65,226,000 68,748,000 82,303,000 100,817,000 73,482,000 21,780,000 36,553,000 39,369,000 30,891,000 23,749,000 34,901,000 32,327,000 23,766,000 20,132,000 31,585,000 29,016,000 22,228,000 19,119,000 23,050,000 20,763,000 17,323,000 14,152,000 21,854,000 19,203,000 17,483,000 13,836,000 19,806,000 17,884,000 12,674,000 12,205,000 23,156,000 22,719,000 18,441,000 20,397,000 23,594,000 25,680,000 8,219,000 8,011,000  7,211,000 6,074,000 7,490,000 8,635,000 7,279,000 6,585,000 6,595,000 6,385,000 5,323,000 4,995,000 5,018,000 4,481,000 3,728,000  
        accrued other
      20,012,000 18,843,000 21,601,000 20,310,000 19,397,000 16,915,000 15,192,000 12,399,000 14,665,000 17,844,000 18,337,000 19,055,000 26,283,000 22,431,000 26,972,000 33,194,000 32,064,000 31,821,000 31,802,000 21,726,000 21,127,000 36,801,000 34,484,000 25,875,000 21,840,000 20,159,000 19,223,000 23,545,000 23,027,000 24,185,000 32,364,000 30,997,000 33,164,000 30,335,000 28,881,000 25,908,000 29,522,000 28,684,000 29,454,000 28,160,000 32,045,000 23,828,000 27,660,000 7,509,000 14,474,000 11,026,000 9,349,000 6,182,000 6,430,000 7,070,000 7,292,000 6,671,000 7,027,000 7,404,000 5,914,000 5,799,000 6,235,000 6,932,000 4,862,000 3,826,000 4,786,000 5,096,000 4,218,000 4,573,000 5,051,000 5,020,000 4,849,000 5,132,000 5,407,000 7,067,000 5,825,000 5,842,000 8,563,000     2,365,000 2,249,000 2,139,000 2,325,000 2,469,000 3,073,000 2,927,000 2,976,000 3,093,000 2,480,000 2,334,000 2,140,000 2,201,000  
        income taxes payable
      1,655,000 982,000 883,000 884,000 883,000 764,000 764,000 764,000 764,000 1,604,000 1,604,000 1,604,000 4,391,000 1,683,000 574,000 2,924,000 4,353,000 5,382,000 4,840,000 5,492,000 7,025,000 233,000 233,000 233,000 903,000 1,517,000 1,517,000 1,517,000 1,318,000 210,000 210,000 210,000 1,526,000 3,240,000 6,263,000 5,057,000 5,057,000   2,091,000 2,091,000   147,000 107,000    791,000 705,000   114,000         1,652,000    6,196,000 4,780,000 3,122,000 1,702,000 5,076,000 2,173,000 1,290,000 1,065,000 839,000 380,000 809,000 192,000 936,000 1,135,000 467,000        490,000 490,000   
        deferred revenue and customer deposits
      330,601,000 321,305,000 276,768,000 293,911,000 301,753,000 284,783,000 263,874,000 279,185,000 301,806,000 293,410,000 275,008,000 282,773,000 311,531,000 317,406,000 287,328,000 297,243,000 330,585,000 296,814,000 246,726,000 257,969,000 269,748,000 251,313,000 236,240,000 249,382,000 270,281,000 261,151,000 234,229,000 246,498,000 272,508,000 260,926,000 230,098,000 248,165,000 301,925,000 299,271,000 269,644,000 279,489,000 310,594,000 299,218,000 282,045,000 279,974,000 296,648,000 255,822,000 233,405,000                                                 
        current portion of operating lease liabilities
      9,874,000 10,053,000 10,009,000 10,883,000 10,995,000 10,959,000 11,876,000 11,859,000 11,979,000 11,979,000 11,671,000 11,727,000 11,650,000 10,779,000 10,463,000 10,985,000 11,411,000 11,441,000 11,992,000 12,125,000 12,354,000 11,753,000 11,325,000 11,026,000 10,337,000 11,091,000 10,533,000 11,066,000                                                                
        total current liabilities
      470,149,000 442,586,000 377,428,000 386,982,000 407,932,000 381,771,000 347,102,000 383,204,000 395,082,000 382,252,000 359,124,000 383,186,000 453,607,000 440,009,000 402,196,000 415,194,000 476,160,000 431,226,000 370,787,000 367,565,000 411,275,000 396,219,000 362,207,000 357,492,000 398,997,000 384,104,000 350,559,000 349,583,000 379,936,000 386,365,000 339,032,000 359,825,000 413,300,000 419,325,000 397,692,000 402,247,000 460,187,000 453,021,000 422,578,000 424,580,000 457,056,000 433,127,000 374,224,000 148,818,000 187,633,000 168,917,000 145,455,000 141,690,000 162,964,000 150,791,000 128,096,000 132,682,000 145,171,000 140,362,000 120,011,000 125,558,000 134,091,000 120,096,000 122,406,000 118,175,000 136,590,000 126,856,000 113,676,000 115,100,000 127,610,000 120,168,000 102,358,000 106,828,000 117,465,000 120,880,000 101,246,000 115,999,000 122,936,000 106,904,000 39,161,000 38,494,000  34,680,000 33,778,000 35,654,000 36,408,000 32,168,000 29,411,000 29,471,000 29,561,000 26,841,000 24,170,000 25,813,000 25,063,000 22,463,000  
        other long-term liabilities
      6,568,000 7,771,000 7,911,000 8,132,000 8,210,000 7,525,000 6,622,000 6,897,000 7,055,000 7,312,000 7,371,000 7,534,000 7,683,000 7,554,000 7,468,000 7,642,000 7,470,000 7,499,000 12,315,000 22,180,000 21,641,000 11,568,000 14,646,000 14,449,000 10,039,000 6,997,000 7,199,000 6,191,000 19,493,000 20,057,000 20,449,000 15,092,000 8,308,000 7,412,000 5,432,000 4,340,000 3,976,000 3,098,000 3,224,000 2,606,000 2,903,000 2,291,000 5,445,000 1,858,000 1,995,000 2,147,000 2,225,000 2,275,000 2,370,000 2,415,000 2,531,000 2,670,000 2,249,000 2,044,000 2,110,000 2,161,000 2,347,000 2,170,000 2,028,000 1,887,000 1,721,000 1,166,000 817,000 455,000 551,000 632,000 684,000 730,000 771,000 804,000 878,000 853,000 159,000 915,000 961,000 1,007,000 1,008,000 1,054,000              
        deferred tax liability
      2,225,000 2,887,000 2,872,000 2,851,000 2,643,000 3,652,000 3,955,000 4,326,000 4,374,000 4,505,000 3,224,000 13,625,000 24,939,000 40,119,000 71,510,000 75,192,000 78,899,000 80,763,000 85,987,000 89,591,000 92,287,000 105,510,000 108,716,000 111,194,000 114,394,000 115,470,000 120,895,000 124,870,000 124,229,000 129,284,000 135,738,000 143,542,000 151,563,000 177,598,000 260,371,000 268,364,000 277,599,000 246,192,000 259,625,000 272,763,000 285,359,000 330,254,000 2,252,000 10,653,000 10,639,000 2,679,000 2,708,000 2,747,000 2,757,000 991,000 979,000 950,000 941,000 2,467,000 1,961,000 1,330,000 1,410,000 1,590,000                                  
        accrued long-term retirement benefits
      28,336,000 29,686,000 29,571,000 29,418,000 27,379,000 27,346,000 29,253,000 28,124,000 28,413,000 26,310,000 25,363,000 26,257,000 26,049,000 34,182,000 30,917,000 33,688,000 34,737,000 38,576,000 39,704,000 40,255,000 39,479,000 38,264,000 36,408,000 35,120,000 34,256,000 35,808,000 35,332,000 35,811,000 36,284,000 33,320,000 34,053,000 33,457,000 35,246,000 35,589,000 35,548,000 33,301,000 32,117,000 29,745,000 31,493,000 31,158,000 31,378,000 28,977,000 28,988,000 1,589,000 1,587,000 1,586,000 1,584,000 1,582,000 1,581,000 1,578,000 1,575,000 1,747,000 1,757,000 1,818,000 1,873,000 1,933,000 1,990,000 2,044,000 1,969,000 1,914,000 1,859,000 1,803,000 1,746,000 1,689,000 1,645,000 1,586,000 1,485,000 1,424,000 1,330,000 1,309,000 1,294,000 1,277,000 1,245,000 1,254,000 1,315,000 1,235,000                
        long-term deferred revenue and customer deposits
      168,261,000 165,694,000 151,311,000 151,842,000 147,510,000 127,070,000 115,825,000 120,638,000 130,212,000 124,619,000 119,305,000 122,381,000 129,814,000 127,513,000 123,477,000 126,621,000 133,121,000 122,227,000 102,457,000 101,929,000 103,310,000 102,713,000 99,581,000 100,100,000 104,240,000 104,339,000 97,013,000 95,529,000 94,619,000 84,881,000 77,135,000 80,491,000 91,409,000 87,747,000 81,660,000 79,232,000 86,595,000 78,206,000 64,201,000 67,025,000 68,129,000 56,570,000 39,224,000                                                 
        operating lease liabilities, net of current portion
      29,718,000 31,751,000 33,539,000 30,650,000 32,509,000 31,798,000 33,527,000 35,231,000 38,101,000 40,898,000 43,654,000 46,404,000 48,819,000 49,582,000 48,839,000 51,409,000 53,927,000 55,671,000 56,144,000 58,579,000 61,267,000 63,814,000 66,673,000 69,355,000 70,658,000 67,814,000 68,112,000 70,582,000                                                                
        total liabilities
      705,257,000 680,375,000 602,632,000 609,875,000 626,183,000 654,162,000 611,284,000 653,420,000 703,237,000 685,896,000 658,041,000 699,387,000 790,911,000 898,959,000 884,407,000 909,746,000 1,134,314,000 1,085,962,000 1,017,394,000 1,030,099,000 1,079,259,000 1,168,088,000 1,138,231,000 1,137,710,000 1,182,584,000 1,164,532,000 1,129,110,000 1,182,566,000 1,204,561,000 1,253,907,000 1,206,407,000 1,232,407,000 1,299,826,000 1,027,671,000 1,085,568,000 1,092,311,000 1,165,263,000 1,115,012,000 1,085,833,000 1,102,806,000 1,149,461,000 1,105,817,000 1,030,451,000 195,358,000 233,299,000 206,810,000 178,919,000 175,511,000 198,602,000 182,279,000 158,614,000 166,204,000 180,273,000 171,778,000 209,450,000 214,644,000 225,388,000 205,197,000 184,842,000 183,529,000 208,011,000 200,661,000 192,064,000 196,654,000 215,758,000 207,156,000 187,455,000 194,796,000 211,003,000 215,469,000 197,325,000 215,137,000 223,604,000 210,603,000 44,660,000 42,068,000 42,012,000 37,340,000 36,389,000 38,005,000 39,164,000 34,752,000 31,904,000 32,079,000 30,838,000 28,088,000 25,428,000 26,700,000 26,069,000   
        commitments and contingencies
                                                                                                 
        stockholders’ equity:
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 authorized; none issued or outstanding
                                                                                                 
        common stock
      136,000   135,000 134,000    131,000    128,000    126,000    124,000    122,000    120,000    117,000    116,000    114,000    51,000    50,000   49,000 49,000    48,000  48,000 48,000 47,000 47,000 47,000 47,000 46,000 45,000 45,000 45,000 45,000  44,000 44,000   37,000 37,000 36,000 36,000 36,000 36,000  35,000 35,000 35,000  35,000 35,000 35,000  34,000  
        additional paid-in capital
      3,325,400,000 3,306,213,000 3,293,220,000 3,274,682,000 3,255,333,000 3,234,959,000 3,221,213,000 3,201,998,000 3,181,366,000 3,158,283,000 3,142,712,000 3,118,798,000 3,099,698,000 3,077,866,000 3,015,644,000 2,993,163,000 3,023,403,000 3,003,679,000 2,991,704,000 2,968,631,000 2,955,400,000 2,936,573,000 2,924,757,000 2,903,055,000 2,891,553,000 2,873,702,000 2,863,003,000 2,841,001,000 2,828,922,000 2,809,901,000 2,796,695,000 2,676,382,000 2,665,120,000 2,735,387,000 2,723,693,000 2,703,275,000 2,693,846,000 2,676,852,000 2,666,997,000 2,650,315,000 2,642,745,000 2,627,807,000 2,619,418,000 302,456,000 298,101,000 292,059,000 287,795,000 278,106,000 273,574,000 267,649,000 263,887,000 256,762,000 253,202,000 248,694,000 245,882,000 239,455,000 237,289,000 232,969,000 231,485,000 229,515,000 227,201,000 219,298,000 213,347,000 210,843,000 209,146,000 200,925,000 196,957,000 194,632,000 192,844,000 189,491,000 188,068,000 185,496,000 182,789,000 180,882,000 124,260,000 122,720,000 122,074,000 120,394,000 118,445,000 117,494,000 120,057,000 115,435,000 114,338,000 114,158,000 112,286,000 112,236,000 111,474,000 111,341,000 110,683,000 110,101,000  
        accumulated other comprehensive income
      4,032,000 3,979,000 3,954,000 4,337,000 4,073,000 3,120,000 4,151,000 3,404,000 3,572,000 5,870,000 5,379,000 5,803,000 5,738,000 -353,000 -1,056,000 -147,000 141,000     262,000   -3,160,000    -2,639,000 -608,000 555,000 -107,000 2,895,000 46,000           -4,645,000 -1,552,000 196,000 2,416,000 2,772,000 2,521,000 2,082,000 878,000 671,000 1,450,000 793,000 -936,000 212,000            -1,461,000 -635,000   246,000 94,000           -130,000 -107,000 -77,000 -123,000 7,000 -11,000  
        treasury stock
      -1,731,396,000 -1,701,954,000 -1,701,464,000 -1,683,481,000 -1,654,702,000 -1,654,569,000 -1,654,239,000 -1,652,642,000 -1,615,483,000 -1,615,279,000 -1,596,026,000 -1,559,534,000 -1,546,128,000 -1,545,922,000 -1,497,886,000 -1,489,687,000 -1,373,840,000 -1,373,394,000 -1,362,141,000 -1,327,273,000 -1,322,496,000 -1,321,978,000 -1,318,535,000 -1,309,038,000 -1,305,935,000 -1,255,675,000 -1,230,440,000 -1,155,252,000 -1,119,063,000 -1,104,042,000 -1,102,481,000 -999,329,000 -995,843,000 -783,878,000 -781,948,000 -676,302,000 -570,921,000 -569,499,000 -564,581,000 -531,434,000 -481,366,000 -381,942,000 -354,511,000 -172,683,000 -169,516,000 -149,345,000 -148,696,000 -129,989,000 -117,802,000 -108,513,000 -99,829,000 -90,950,000 -83,480,000  -70,173,000 -62,445,000 -56,032,000 -53,376,000 -53,234,000 -36,863,000 -35,437,000 -32,139,000 -31,981,000 -31,870,000 -31,691,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000 -28,939,000  -27,473,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000 -26,490,000  
        retained earnings
      51,088,000 32,848,000       322,479,000 354,898,000 487,475,000 466,013,000 470,213,000 473,434,000 420,816,000 403,433,000 410,565,000 418,971,000 371,246,000 363,350,000 374,691,000 363,254,000 334,233,000 337,919,000 355,339,000 348,003,000 311,278,000 328,750,000 358,093,000 338,107,000 341,710,000 368,138,000 396,493,000 379,676,000 289,991,000 292,459,000 316,681,000 294,371,000 273,126,000 274,392,000 283,390,000 287,006,000 311,513,000 319,428,000 311,759,000 290,905,000 273,276,000 262,043,000 250,567,000 233,891,000 216,597,000 206,714,000 201,461,000 186,908,000 175,770,000 165,860,000 160,852,000 147,905,000 137,874,000 130,823,000 128,424,000 117,653,000 106,552,000 98,304,000 91,159,000 84,106,000 75,565,000 68,479,000 63,242,000 57,568,000 49,633,000 44,691,000 43,194,000 48,107,000 51,213,000 47,962,000 45,282,000 43,204,000 41,220,000 38,919,000 37,545,000 35,741,000 33,854,000 32,400,000 31,748,000 31,138,000 30,232,000 29,175,000 28,878,000 29,055,000  
        total stockholders’ equity
      1,649,260,000 1,641,222,000               2,060,395,000    2,005,779,000    1,937,919,000    2,065,433,000    2,068,782,000   2,317,519,000 2,436,250,000 2,397,885,000 2,373,952,000 2,391,652,000 2,443,382,000 2,529,297,000 2,573,620,000 446,394,000 435,750,000 432,118,000 412,622,000 412,626,000 409,161,000 395,598,000 382,787,000 373,453,000 371,903,000 360,342,000 352,321,000 341,982,000 342,369,000 325,695,000 315,309,000 322,941,000 319,559,000 303,747,000 287,106,000 275,792,000 266,843,000 254,320,000  232,619,000 225,731,000 217,529,000 207,266,000 200,396,000 197,333,000 200,187,000 146,568,000 141,717,000 138,407,000 135,690,000 132,168,000 129,825,000 126,591,000 123,979,000 120,884,000 119,298,000 117,449,000 116,812,000 115,174,000 113,938,000 113,112,000 112,663,000  
        total liabilities and stockholders’ equity
      2,354,517,000 2,321,597,000               3,194,709,000    3,085,038,000    3,120,503,000    3,269,994,000    3,368,608,000   3,409,830,000 3,601,513,000 3,512,897,000 3,459,785,000 3,494,458,000 3,592,843,000 3,635,114,000 3,604,071,000 641,752,000 669,049,000 638,928,000 591,541,000 588,137,000 607,763,000 577,877,000 541,401,000 539,657,000 552,176,000 532,120,000 561,771,000 556,626,000 567,757,000 530,892,000 500,151,000 506,470,000 527,570,000 504,408,000 479,170,000 472,446,000 482,601,000 461,476,000 429,518,000 427,415,000 436,734,000 432,998,000 404,591,000 415,533,000 420,937,000 410,790,000 191,228,000 183,785,000 180,419,000 173,030,000 168,557,000 167,830,000 165,755,000 158,731,000 152,788,000 151,377,000 148,287,000 144,900,000 140,602,000 140,638,000 139,181,000 135,126,000  
        marketable securities and investments
       32,361,000 33,483,000 42,937,000 34,058,000 28,536,000 37,512,000 43,954,000 33,459,000 31,457,000 48,652,000 51,887,000                                                                                
        accounts receivable and unbilled costs, net of allowance for credit losses of 129 and 214 at december 31, 2025 and march 31, 2025, respectively
       234,554,000                                                                                          
        preferred stock, 0.001 par value...
                                                                                                 
        common stock, 0.001 par value...
       136,000 136,000                                                                                         
        accounts receivable and unbilled costs, net of allowance for credit losses of 98 and 214 at september 30, 2025 and march 31, 2025, respectively
        130,158,000                                                                                         
        liabilities and stockholders' equity
                                                                                                 
        stockholders' equity:
                                                                                                 
        accumulated deficit
        -22,294,000 -48,122,000                                                                                        
        total stockholders' equity
        1,573,552,000 1,547,551,000 1,560,395,000 1,520,583,000 1,459,388,000 1,431,996,000 1,892,065,000 1,903,903,000 2,039,670,000 2,031,210,000 2,029,649,000 2,005,153,000 1,937,646,000 1,906,889,000  2,047,587,000 1,999,004,000 2,002,955,000  1,978,235,000 1,939,320,000 1,929,817,000  1,962,807,000 1,940,264,000 2,011,435,000  2,043,477,000 2,036,598,000 2,045,201,000  2,331,348,000 2,232,357,000                                                         
        total liabilities and stockholders' equity
        2,176,184,000 2,157,426,000 2,186,578,000 2,174,745,000 2,070,672,000 2,085,416,000 2,595,302,000 2,589,799,000 2,697,711,000 2,730,597,000 2,820,560,000 2,904,112,000 2,822,053,000 2,816,635,000  3,133,549,000 3,016,398,000 3,033,054,000  3,146,323,000 3,077,551,000 3,067,527,000  3,127,339,000 3,069,374,000 3,194,001,000  3,297,384,000 3,243,005,000 3,277,608,000  3,359,019,000 3,317,925,000                                                         
        accounts receivable and unbilled costs, net of allowance for credit losses of 92 and 214 at june 30, 2025 and march 31, 2025, respectively
         92,200,000                                                                                        
        preferred stock, 0.001 par value:5,000,000 shares authorized; no shares issued or outstanding at june 30, 2025 and march 31, 2025
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 214 and 479 at march 31, 2025 and 2024, respectively
          163,654,000                                                                                       
        long-term debt
           75,000,000 75,000,000 75,000,000 100,000,000 100,000,000 100,000,000 100,000,000 100,000,000 200,000,000 200,000,000 200,000,000 350,000,000 350,000,000 350,000,000 350,000,000 350,000,000 450,000,000 450,000,000 450,000,000 450,000,000 450,000,000 450,000,000 500,000,000 550,000,000 600,000,000 600,000,000 600,000,000 600,000,000 300,000,000 300,000,000 300,000,000 300,000,000 300,000,000 300,000,000 300,000,000 300,000,000 250,000,000 250,000,000            62,000,000 62,000,000 62,000,000 62,000,000 45,606,000 49,356,000 53,106,000 56,856,000 60,606,000 64,356,000 68,106,000 71,856,000 74,356,000 76,856,000 82,500,000 85,000,000 87,500,000 90,000,000 92,500,000 95,000,000                  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2025 and 2024
                                                                                                 
        (accumulated deficit) retained earnings
          -44,443,000 -63,060,000 -111,870,000 -120,897,000                                                                                    
        accounts receivable and unbilled costs, net of allowance for credit allowances of 85 and 479 at december 31, 2024 and march 31, 2024, respectively
           214,585,000                                                                                      
        preferred stock, 0.001 par value:
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2024 and march 31, 2024
                                                                                                 
        300,000,000 shares authorized; 133,718,142 and 131,316,309 shares issued and 71,745,945 and 71,404,216 shares outstanding at december 31, 2024 and march 31, 2024, respectively
           133,000                                                                                      
        accounts receivable and unbilled costs, net of allowance for credit allowances of 64 and 479 at september 30, 2024 and march 31, 2024, respectively
            118,632,000                                                                                     
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2024 and march 31, 2024
                                                                                                 
        300,000,000 shares authorized; 133,671,490 and 131,316,309 shares issued and 71,715,229 and 71,404,216 shares outstanding at september 30, 2024 and march 31, 2024, respectively
            133,000                                                                                     
        accounts receivable and unbilled costs, net of allowance for credit allowances of 116 and 479 at june 30, 2024 and march 31, 2024, respectively
             129,270,000                                                                                    
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2024 and march 31, 2024
                                                                                                 
        300,000,000 shares authorized; 133,189,228 and 131,316,309 shares issued and 71,311,409 and 71,404,216 shares outstanding at june 30, 2024 and march 31, 2024, respectively
             133,000                                                                                    
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 479 and 675 at march 31, 2024 and 2023, respectively
              192,096,000                                                                                   
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2024 and 2023
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,076 and 675 at december 31, 2023 and march 31, 2023, respectively
               221,574,000                                                                                  
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2023 and march 31, 2023
                                                                                                 
        300,000,000 shares authorized; 130,922,477 and 128,683,824 shares issued and 71,019,904 and 71,249,045 shares outstanding at december 31, 2023 and march 31, 2023, respectively
               131,000                                                                                  
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 666 and 675 at september 30, 2023 and march 31, 2023, respectively
                152,603,000                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2023 and march 31, 2023
                                                                                                 
        300,000,000 shares authorized; 130,875,398 and 128,683,824 shares issued and 71,697,901 and 71,249,045 shares outstanding at september 30, 2023 and march 31, 2023, respectively
                130,000                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 666 and 675 at june 30, 2023 and march 31, 2023, respectively
                 108,292,000                                                                                
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2023 and march 31, 2023
                                                                                                 
        300,000,000 shares authorized; 130,016,041 and 128,683,824 shares issued and 72,146,090 and 71,249,045 shares outstanding at june 30, 2023 and march 31, 2023, respectively
                 130,000                                                                                
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 675 and 1,649 at march 31, 2023 and 2022, respectively
                  143,855,000                                                                               
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2023 and 2022
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,002 and 1,649 at december 31, 2022 and march 31, 2022, respectively
                   215,838,000                                                                              
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2022 and march 31, 2022
                                                                                                 
        300,000,000 shares authorized; 128,389,414 and 126,425,383 shares issued and 70,961,344 and 74,102,293 shares outstanding at december 31, 2022 and march 31, 2022, respectively
                   128,000                                                                              
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,903 and 1,649 at september 30, 2022 and march 31, 2022, respectively
                    139,126,000                                                                             
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2022 and march 31, 2022
                                                                                                 
        300,000,000 shares authorized; 128,373,156 and 126,425,383 shares issued and 72,243,650 and 74,102,293 shares outstanding at september 30, 2022 and march 31, 2022, respectively
                    128,000                                                                             
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,614 and 1,649 at june 30, 2022 and march 31, 2022, respectively
                     112,889,000                                                                            
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2022 and march 31, 2022
                                                                                                 
        300,000,000 shares authorized; 127,371,813 and 126,425,383 shares issued and 71,483,821 and 74,102,293 shares outstanding at june 30, 2022 and march 31, 2022, respectively
                     127,000                                                                            
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,649 and 416 at march 31, 2022 and 2021, respectively
                      148,245,000                                                                           
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2022 and 2021
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 220 and 416 at december 31, 2021 and march 31, 2021, respectively
                       233,854,000                                                                          
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2021 and march 31, 2021
                                                                                                 
        300,000,000 shares authorized; 126,137,308 and 124,197,974 shares issued and 73,828,546 and 73,751,615 shares outstanding at december 31, 2021 and march 31, 2021, respectively
                       126,000                                                                          
        accumulated other comprehensive loss
                       -1,795,000 -1,931,000 -1,877,000 -1,940,000  -1,258,000 -2,241,000  -3,345,000 -3,699,000 -3,184,000       505,000 -2,029,000 -3,472,000 -3,955,000 -1,705,000 -1,735,000 -1,501,000 -3,688,000 -2,914,000 -2,858,000              -1,851,000 -864,000 -582,000 -676,000 -1,112,000 -859,000 -1,532,000 -1,817,000 -1,817,000 -1,565,000 -1,598,000       -3,000 -63,000  -54,000 -60,000 -134,000 -122,000 -104,000 -114,000 -92,000        
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 398 and 416 at september 30, 2021 and march 31, 2021, respectively
                        162,888,000                                                                         
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2021 and march 31, 2021
                                                                                                 
        300,000,000 shares authorized; 126,108,858 and 124,197,974 shares issued and 74,217,661 and 73,751,615 shares outstanding at september 30, 2021 and march 31, 2021, respectively
                        126,000                                                                         
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 407 and 416 at june 30, 2021 and march 31, 2021, respectively
                         146,199,000                                                                        
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2021 and march 31, 2021
                                                                                                 
        300,000,000 shares authorized; 124,694,737 and 124,197,974 shares issued and 74,084,245 and 73,751,615 shares outstanding at june 30, 2021 and march 31, 2021, respectively
                         124,000                                                                        
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 416 and 1,350 at march 31, 2021 and 2020, respectively
                          197,717,000                                                                       
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2021 and 2020
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 719 and 1,350 at december 31, 2020 and march 31, 2020, respectively
                           208,016,000                                                                      
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2020 and march 31, 2020
                                                                                                 
        300,000,000 shares authorized; 123,867,373 and 122,006,077 shares issued and 73,438,024 and 72,220,906 shares outstanding at december 31, 2020 and march 31, 2020, respectively
                           124,000                                                                      
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 782 and 1,350 at september 30, 2020 and march 31, 2020, respectively
                            169,687,000                                                                     
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2020 and march 31, 2020
                                                                                                 
        300,000,000 shares authorized; 123,840,945 and 122,006,077 shares issued and 73,574,035 and 72,220,906 shares outstanding at september 30, 2020 and march 31, 2020, respectively
                            123,000                                                                     
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 853 and 1,350 at june 30, 2020 and march 31, 2020, respectively
                             138,793,000                                                                    
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2020 and march 31, 2020
                                                                                                 
        300,000,000 shares authorized; 122,353,504 and 122,006,077 shares issued and 72,455,170 and 72,220,906 shares outstanding at june 30, 2020 and march 31, 2020, respectively
                             122,000                                                                    
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,350 and 1,583 at march 31, 2020 and 2019, respectively
                              213,514,000                                                                   
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2020 and 2019
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,728 and 1,583 at december 31, 2019 and march 31, 2019, respectively
                               244,877,000                                                                  
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2019 and march 31, 2019
                                                                                                 
        300,000,000 shares authorized; 121,679,117 and 119,760,132 shares issued and 73,855,221 and 77,610,361 shares outstanding at december 31, 2019 and march 31, 2019, respectively
                               122,000                                                                  
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 2,280 and 1,583 at september 30, 2019 and march 31, 2019, respectively
                                202,288,000                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2019 and march 31, 2019
                                                                                                 
        300,000,000 shares authorized; 121,648,747 and 119,760,132 shares issued and 74,838,047 and 77,610,361 shares outstanding at september 30, 2019 and march 31, 2019, respectively
                                122,000                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,690 and 1,583 at june 30, 2019 and march 31, 2019, respectively
                                 160,039,000                                                                
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2019 and march 31, 2019
                                                                                                 
        300,000,000 shares authorized; 120,123,018 and 119,760,132 shares issued and 76,554,298 and 77,610,361 shares outstanding at june 30, 2019 and march 31, 2019, respectively
                                 120,000                                                                
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,583 and 1,991 at march 31, 2019 and 2018, respectively
                                  235,318,000                                                               
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2019 and 2018
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,705 and 1,991 at december 31, 2018 and march 31, 2018, respectively
                                   247,690,000                                                              
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2018 and march 31, 2018
                                                                                                 
        300,000,000 shares authorized; 119,417,029 and 117,744,913 shares issued and 77,831,786 and 80,270,023 shares outstanding at december 31, 2018 and march 31, 2018, respectively
                                   119,000                                                              
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,209 and 1,991 at september 30, 2018 and march 31, 2018, respectively
                                    184,156,000                                                             
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2018 and march 31, 2018
                                                                                                 
        300,000,000 shares authorized; 119,231,287 and 117,744,913 shares issued and 77,704,724 and 80,270,023 shares outstanding at september 30, 2018 and march 31, 2018, respectively
                                    119,000                                                             
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,473 and 1,991 at june 30, 2018 and march 31, 2018, respectively
                                     165,331,000                                                            
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2018 and march 31, 2018
                                                                                                 
        300,000,000 shares authorized; 118,139,282 and 117,744,913 shares issued and 80,535,277 and 80,270,023 shares outstanding at june 30, 2018 and march 31, 2018, respectively
                                     117,000                                                            
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,991 and 2,066 at march 31, 2018 and 2017, respectively
                                      213,438,000                                                           
        contingent liabilities, net of current portion
                                          4,789,000    4,636,000 4,598,000 4,560,000 4,521,000 4,484,000 4,445,000 4,407,000 4,369,000 4,291,000 4,219,000 4,139,000 4,068,000 4,248,000 2,370,000 3,102,000 3,657,000 4,828,000 4,986,000                                  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2018 and 2017
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,675 and 2,066 at december 31, 2017 and march 31, 2017, respectively
                                       249,939,000                                                          
        contingent liabilities
                                        4,865,000 4,827,000  4,750,000 4,712,000 4,674,000                                                    
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2017 and march 31, 2017
                                                                                                 
        300,000,000 shares authorized; 117,331,491 and 115,917,431 shares issued and 87,267,106 and 92,041,288 shares outstanding at december 31, 2017 and march 31, 2017, respectively
                                       117,000                                                          
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,689 and 2,066 at september 30, 2017 and march 31, 2017, respectively
                                        215,227,000                                                         
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2017 and march 31, 2017
                                                                                                 
        300,000,000 shares authorized; 117,137,727 and 115,917,431 shares issued and 87,140,939 and 92,041,288 shares outstanding at september 30, 2017 and march 31, 2017, respectively
                                        116,000                                                         
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 1,186 and 2,066 at june 30, 2017 and march 31, 2017, respectively
                                         185,881,000                                                        
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2017 and march 31, 2017
                                                                                                 
        300,000,000 shares authorized; 116,342,146 and 115,917,431 shares issued and 89,538,391 and 92,041,288 shares outstanding at june 30, 2017 and march 31, 2017, respectively
                                         116,000                                                        
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 2,066 and 5,069 at march 31, 2017 and 2016, respectively
                                          294,374,000                                                       
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2017 and 2016
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 8,753 and 5,069 at december 31, 2016 and march 31, 2016, respectively
                                           284,055,000                                                      
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2016 and march 31, 2016
                                                                                                 
        300,000,000 and 150,000,000 shares authorized; 115,620,378 and 114,495,614 shares issued and 91,786,929 and 94,088,469 shares outstanding at december 31, 2016 and march 31, 2016, respectively
                                           116,000                                                      
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 6,838 and 5,069 at september 30, 2016 and march 31, 2016, respectively
                                            240,599,000                                                     
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2016 and march 31, 2016
                                                                                                 
        300,000,000 and 150,000,000 shares authorized; 115,416,135 and 114,495,614 shares issued and 91,752,414 and 94,088,469 shares outstanding at september 30, 2016 and march 31, 2016, respectively
                                            115,000                                                     
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 6,212 and 5,069 at june 30, 2016 and march 31, 2016, respectively
                                             196,227,000                                                    
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2016 and march 31, 2016
                                                                                                 
        150,000,000 shares authorized; 114,503,040 and 114,495,614 shares issued and 91,992,604 and 94,088,469 shares outstanding at june 30, 2016 and march 31, 2016, respectively
                                             114,000                                                    
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 5,069 and 173 at march 31, 2016 and 2015, respectively
                                              247,199,000                                                   
        inventories
                                              58,029,000 63,427,000 71,066,000 12,710,000 12,130,000 10,274,000 14,505,000 11,026,000 12,580,000 11,128,000 10,728,000 10,940,000 7,563,000 7,427,000 8,343,000 7,494,000 8,021,000 9,414,000 8,963,000 9,591,000 8,925,000 8,948,000 11,412,000 9,964,000 9,181,000 8,728,000 7,414,000 7,260,000 6,850,000 7,955,000 7,285,000 12,590,000 12,083,000 10,197,000 4,846,000 4,932,000 4,562,000 4,426,000 4,323,000 4,386,000 2,816,000 4,121,000 4,514,000 3,123,000 3,114,000 3,113,000 2,949,000 2,985,000 3,366,000 2,973,000  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2016 and 2015
                                                                                                 
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 4,720 and 173 at december 31, 2015 and march 31, 2015, respectively
                                               244,957,000                                                  
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2015 and march 31, 2015
                                                                                                 
        150,000,000 shares authorized; 114,075,319 and 50,812,548 shares issued and 98,570,412 and 40,807,805 shares outstanding at december 31, 2015 and march 31, 2015, respectively
                                               114,000                                                  
        accounts receivable and unbilled costs, net of allowance for doubtful accounts of 8,984 and 173 at september 30, 2015 and march 31, 2015, respectively
                                                165,092,000                                                 
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2015 and march 31, 2015
                                                                                                 
        150,000,000 shares authorized; 113,858,772 and 50,812,548 shares issued and 99,131,910 and 40,807,805 shares outstanding at september 30, 2015 and march 31, 2015, respectively
                                                114,000                                                 
        accounts receivable
                                                 58,496,000 82,226,000 83,415,000 49,786,000 32,955,000 60,518,000 74,263,000 55,672,000 50,922,000 73,900,000 61,908,000 28,895,000 38,809,000 69,795,000 49,593,000 49,677,000 41,361,000 62,801,000 56,792,000 41,448,000 40,318,000 65,556,000 57,650,000 33,159,000 29,016,000 39,827,000 45,979,000 25,906,000 26,433,000 32,048,000 48,517,000 18,709,000 15,894,000 18,317,000 16,468,000 17,913,000 15,021,000 16,765,000 18,998,000 12,204,000 11,107,000 11,886,000 13,172,000 9,653,000 11,521,000 10,851,000 9,486,000  
        deferred revenue
                                                 108,179,000 123,422,000 107,595,000 95,022,000 101,871,000 109,301,000 102,010,000 88,319,000 93,749,000 95,055,000 90,567,000 79,750,000 88,759,000 93,493,000 82,802,000 77,376,000 78,618,000 85,241,000 80,384,000 71,810,000 75,670,000 84,196,000 72,584,000 61,937,000 66,279,000 70,815,000 69,330,000 58,731,000 73,651,000 74,257,000 51,929,000 22,365,000 24,234,000  21,369,000 20,250,000 21,747,000 21,382,000 18,265,000 16,272,000 17,425,000 17,680,000 15,751,000 14,832,000 15,536,000 15,968,000 14,619,000  
        long-term deferred revenue
                                                 27,919,000 26,961,000 27,036,000 22,540,000 22,848,000 24,639,000 22,285,000 21,294,000 24,087,000 25,907,000 22,717,000 18,393,000 18,005,000 18,722,000 12,311,000 12,833,000 12,197,000 14,735,000 13,980,000 15,219,000 15,054,000 17,846,000 12,914,000 8,572,000 8,958,000 8,937,000 7,476,000 6,407,000 7,008,000 6,764,000 6,530,000 3,223,000 1,332,000                
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2015 and march 31, 2015
                                                                                                 
        150,000,000 shares authorized; 50,834,158 and 50,812,548 shares issued and 40,752,954 and 40,807,805 shares outstanding at june 30, 2015 and march 31, 2015, respectively
                                                 51,000                                                
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2015 and 2014
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2014 and march 31, 2014
                                                                                                 
        150,000,000 shares authorized; 50,717,718 and 49,922,959 shares issued and 41,217,480 and 41,165,784 shares outstanding at december 31, 2014 and march 31, 2014, respectively
                                                   51,000                                              
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2014 and march 31, 2014
                                                                                                 
        150,000,000 shares authorized; 50,665,227 and 49,922,959 shares issued and 41,181,526 and 41,165,784 shares outstanding at september 30, 2014 and march 31, 2014, respectively
                                                    51,000                                             
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2014 and march 31, 2014
                                                                                                 
        150,000,000 shares authorized; 50,111,676 and 49,922,959 shares issued and 41,042,273 and 41,165,784 shares outstanding at june 30, 2014 and march 31, 2014, respectively
                                                     50,000                                            
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2014 and 2013
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2013 and march 31, 2013
                                                                                                 
        150,000,000 shares authorized; 49,826,807 and 49,007,491 shares issued and 41,326,074 and 41,466,921 shares outstanding at december 31, 2013 and march 31, 2013, respectively
                                                       50,000                                          
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2013 and march 31, 2013
                                                                                                 
        150,000,000 shares authorized; 49,706,643 and 49,007,491 shares issued and 41,504,713 and 41,466,921 shares outstanding at september 30, 2013 and march 31, 2013, respectively
                                                        50,000                                         
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2013 and march 31, 2013
                                                                                                 
        current portion of contingent liabilities
                                                          1,229,000 4,224,000 3,775,000 3,775,000 3,774,000 3,014,000                                  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2013 and 2012
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2012 and march 31, 2012
                                                                                                 
        150,000,000 shares authorized; 48,887,013 and 48,185,731 shares issued and 41,604,647 and 41,814,191 shares outstanding at december 31, 2012 and march 31, 2012, respectively
                                                           49,000                                      
        march 31, 2012, respectively
                                                           -76,759,000                                      
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2012 and march 31, 2012
                                                                                                 
        150,000,000 shares authorized; 48,802,859 and 48,185,731 shares issued and 41,788,722 and 41,814,191 shares outstanding at september 30, 2012 and march 31, 2012, respectively
                                                            49,000                                     
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2012 and march 31, 2012
                                                                                                 
        150,000,000 shares authorized; 48,401,084 and 48,185,731 shares issued and 41,709,141 and 41,814,191 shares outstanding at june 30, 2012 and march 31, 2012, respectively
                                                             48,000                                    
        current portion of long-term debt
                                                                15,000,000 15,000,000 15,000,000 15,000,000 13,750,000 12,500,000 11,250,000 10,000,000 10,000,000 13,144,000                        
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2012 and 2011
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2011 and march 31, 2011
                                                                                                 
        150,000,000 shares authorized; 47,778,373 and 47,441,879 shares issued and 41,534,672 and 42,557,221 shares outstanding at december 31, 2011 and march 31, 2011, respectively
                                                               48,000                                  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2011 and march 31, 2011
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2011 and march 31, 2011
                                                                                                 
        acquired intangible assets
                                                                  47,686,000 49,158,000 50,630,000 52,101,000 53,573,000 55,154,000 56,639,000 58,125,000 59,610,000 61,095,000 62,581,000 64,066,000 65,569,000 67,159,000 226,000 331,000  586,000              
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2011 and 2010
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2010 and march 31, 2010
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2010 and march 31, 2010
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2010 and march 31, 2010
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2010 and 2009
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2009 and march 31, 2009
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2009 and march 31, 2009
                                                                                                 
        total stockholder’s equity
                                                                        242,063,000                         
        refundable income taxes
                                                                         6,650,000 8,389,000 5,751,000 5,723,000 5,629,000 5,036,000 1,278,000 309,000 284,000 657,000 300,000 198,000 202,000 985,000 1,319,000 1,419,000 1,477,000 1,399,000 1,231,000 1,411,000 2,172,000 2,102,000 1,935,000  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2009 and march 31, 2009
                                                                                                 
        long-term debt, current portion
                                                                          10,000,000 10,000,000 8,750,000 7,500,000 6,250,000 5,000,000                  
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2009 and 2008
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2008 and march 31, 2008
                                                                                                 
        150,000,000 shares authorized; 43,890,018 and 43,370,802 shares issued and 39,358,001 and 38,838,785 shares outstanding at december 31, 2008 and march 31, 2008, respectively
                                                                           44,000                      
        deferred financing costs
                                                                            829,000 892,000 956,000 952,000                  
        restricted cash
                                                                            122,000 121,000 121,000 156,000      1,342,000 1,339,000 1,337,000 1,334,000 1,332,000        
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2008 and march 31, 2008
                                                                                                 
        accumulated other comprehensive gain
                                                                            -1,540,000 -896,000                    
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2008 and march 31, 2008
                                                                                                 
        capitalized software development costs
                                                                              7,000 48,000 89,000 129,000 170,000 211,000 252,000 293,000 312,000 84,000  55,000 221,000 387,000 552,000 718,000 884,000 1,049,000  
        5,000,000 shares authorized; no shares issued or outstanding at march 31, 2008 and 2007
                                                                                                 
        150,000,000 shares authorized; 43,370,802 and 36,581,852 shares issued and 38,838,785 and 32,049,835 shares outstanding at march 31, 2008 and 2007, respectively
                                                                              43,000                   
        accrued other liabilities
                                                                               9,429,000 3,690,000 2,467,000                
        5,000,000 shares authorized; no shares issued or outstanding at december 31, 2007 and march 31, 2007
                                                                                                 
        150,000,000 shares authorized; 43,127,118 and 36,581,852 shares issued and 38,595,101 and 32,049,835 shares outstanding at december 31, 2007 and march 31, 2007, respectively
                                                                               43,000                  
        commitments and contingencies (note 7) stockholders’ equity:
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at september 30, 2007 and march 31, 2007
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at june 30, 2007 and march 31, 2007
                                                                                                 
        cash and cash equivalents.
                                                                                  18,925,000               
        marketable securities.
                                                                                  69,204,000               
        deferred income taxes.
                                                                                  2,535,000               
        prepaid expenses and other current assets.
                                                                                  3,380,000               
        total current assets.
                                                                                  117,580,000               
        fixed assets, net.
                                                                                  8,262,000               
        acquired intangible assets, net.
                                                                                  442,000               
        long-term marketable securities.
                                                                                  11,975,000               
        other assets.
                                                                                  47,000               
        accounts payable.
                                                                                  3,023,000               
        accrued compensation.
                                                                                  8,271,000               
        accrued other.
                                                                                  2,609,000               
        deferred acquisition payment.
                                                                                                 
        deferred revenue.
                                                                                  23,992,000               
        total current liabilities.
                                                                                  38,087,000               
        accrued long-term retirement benefits (note 16).
                                                                                  1,155,000               
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at march 31, 2007 and 2006
                                                                                                 
        accumulated other comprehensive loss.
                                                                                  -46,000               
        deferred compensation
                                                                                      -4,434,000 -638,000 -739,000 -713,000      -26,000  
        deferred acquisition payment
                                                                                     1,342,000 1,339,000 1,337,000 1,334,000 1,332,000        
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2006 and march 31, 2006
                                                                                                 
        2006, respectively
                                                                                   -27,890,000              
        other intangible assets
                                                                                    729,000 872,000 1,015,000 1,159,000 1,302,000 1,446,000        
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2006 and march 31, 2006
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2006 and march 31, 2006
                                                                                                 
        prepaids and other current assets
                                                                                      3,119,000  2,098,000 2,954,000 3,003,000 2,486,000 2,706,000 2,283,000 2,175,000 2,037,000  
        5,000,000 shares authorized; no shares issued or outstanding at march 31, 2006 and 2005
                                                                                                 
        150,000,000 shares authorized; 35,488,019 and 34,892,273 shares issued and 31,284,796 and 30,689,050 shares outstanding at march 31, 2006 and 2005, respectively
                                                                                      35,000           
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2005 and march 31, 2005
                                                                                                 
        total long term liabilities
                                                                                        2,493,000 2,608,000        
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2005 and march 31, 2005
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2005 and march 31, 2005
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at march 31, 2005 and 2004
                                                                                                 
        150,000,000 shares authorized; 34,892,273 and 34,584,577 shares issued and 30,689,050 and 30,381,354 shares outstanding at march 31, 2005 and 2004, respectively
                                                                                          35,000       
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2004 and march 31, 2004
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at september 30, 2004 and march 31, 2004
                                                                                                 
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at june 30, 2004 and march 31, 2004
                                                                                                 
        5,000,000 shares authorized; no shares issued or outstanding at march 31, 2004 and 2003
                                                                                                 
        150,000,000 shares authorized; 34,584,577 and 34,151,894 shares issued and 30,381,354 and 29,982,671 shares outstanding at march 31, 2004 and 2003, respectively
                                                                                              34,000   
        preferred stock, 0.001 par value: 5,000,000 shares authorized; no shares issued or outstanding at december 31, 2003 and march 31,2003
                                                                                                 
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-03-31 2025-12-31 2025-09-30 2025-06-30 2025-03-31 2024-12-31 2024-09-30 2024-06-30 2024-03-31 2023-12-31 2023-09-30 2023-06-30 2023-03-31 2022-12-31 2022-09-30 2022-06-30 2022-03-31 2021-12-31 2021-09-30 2021-06-30 2021-03-31 2020-12-31 2020-09-30 2020-06-30 2020-03-31 2019-12-31 2019-09-30 2019-06-30 2019-03-31 2018-12-31 2018-09-30 2018-06-30 2018-03-31 2017-12-31 2017-09-30 2017-06-30 2017-03-31 2016-12-31 2016-09-30 2016-06-30 2016-03-31 2015-12-31 2015-09-30 2015-06-30 2015-03-31 2014-12-31 2014-09-30 2014-06-30 2014-03-31 2013-12-31 2013-09-30 2013-06-30 2013-03-31 2012-12-31 2012-09-30 2012-06-30 2012-03-31 2011-12-31 2011-09-30 2011-06-30 2011-03-31 2010-12-31 2010-09-30 2010-06-30 2010-03-31 2009-12-31 2009-09-30 2009-06-30 2009-03-31 2008-12-31 2008-09-30 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 2006-12-31 2006-09-30 2006-06-30 2006-03-31 2005-12-31 2005-09-30 2005-06-30 2005-03-31 2004-12-31 2004-09-30 2004-06-30 2004-03-31 
                                                                                                 
          cash flows from operating activities:
                                                                                                 
          net income
        18,240,000 55,142,000       -32,419,000 -132,577,000   -3,221,000 52,618,000   -8,406,000    11,437,000        19,211,000    16,817,000    22,310,000   -8,998,000 -3,616,000 -24,507,000 -7,915,000 7,669,000 20,854,000 17,629,000 11,233,000 11,476,000 16,676,000 17,294,000 9,883,000 5,253,000 14,553,000 11,138,000 9,910,000 5,008,000 12,947,000 10,031,000 7,051,000 2,399,000 10,771,000 11,101,000 8,248,000 7,145,000 7,053,000 8,541,000 7,086,000 5,237,000 5,674,000 7,935,000 4,942,000 1,497,000 -4,913,000 -3,106,000 3,251,000 2,680,000 2,078,000 1,983,000 2,302,000 1,374,000 1,804,000 1,887,000 1,454,000 652,000 610,000 906,000 1,057,000 297,000  
          adjustments to reconcile net income to cash from operating activities, net of the effects of acquisitions:
                                                                                                 
          depreciation and amortization
        14,223,000 13,499,000 14,354,000 14,457,000 15,596,000 15,685,000 16,100,000 16,405,000 18,058,000 18,518,000 18,974,000 19,436,000 21,616,000 21,455,000 21,262,000 21,585,000 23,737,000 23,801,000 24,009,000 24,237,000 26,190,000 26,486,000 27,143,000 26,009,000 28,707,000 28,731,000 29,331,000 29,335,000 31,369,000 31,951,000 34,211,000 40,347,000 40,644,000 37,650,000 37,496,000 37,713,000 39,974,000 40,308,000 40,407,000 40,174,000 42,403,000 45,871,000 46,811,000 4,986,000 5,260,000 4,696,000 4,877,000 4,876,000 4,486,000 4,262,000 4,653,000 4,859,000 3,638,000 4,757,000 4,694,000 4,375,000 4,451,000 4,214,000 4,196,000 3,781,000 3,508,000 3,494,000 3,403,000 3,472,000 3,490,000 3,688,000 3,580,000 3,599,000 3,191,000 3,406,000 3,752,000 3,456,000 3,649,000 2,851,000 1,342,000 884,000 961,000             
          loss on extinguishment of debt
                                                                                             
          operating lease right-of-use assets
                2,676,000 2,639,000 2,626,000 2,592,000 2,614,000 2,657,000 2,664,000 2,663,000 2,703,000 2,685,000 2,225,000 2,679,000 2,184,000 2,630,000 2,614,000 2,576,000 2,632,000 2,766,000 2,554,000 2,552,000                                                              
          gain on divestiture of a business
                                                                                               
          loss on disposal of fixed assets
        1,000 17,000 5,000   4,000 254,000 7,000 38,000 2,000 34,000   3,000 1,000 1,000 199,000 4,000 33,000    79,000 7,000 111,000 63,000 23,000 37,000 10,000 411,000 172,000 41,000 20,000 38,000 3,000 -91,000 212,000 10,000 -236,000    1,000 1,000 13,000 24,000 33,000 47,000 24,000 19,000 22,000 57,000 70,000 36,000 15,000 58,000 18,000 11,000 158,000 70,000 19,000 -325,000 333,000 5,000 8,000  9,000 5,000 17,000 34,000 78,000 31,000 30,000 27,000 15,000 43,000 19,000 23,000 
          share-based compensation expense associated with equity awards
                                       12,965,000 12,063,000 12,425,000 12,598,000 10,231,000 8,918,000 10,469,000 11,670,000 8,132,000 7,951,000 8,302,000 7,503,000 4,595,000 4,633,000 4,150,000 4,495,000 3,302,000 2,971,000 3,217,000 3,930,000 2,812,000 2,337,000 2,464,000 2,543,000 2,247,000 2,534,000 2,170,000 1,788,000 2,159,000 2,300,000 1,460,000 1,501,000 1,178,000 1,682,000 1,207,000 1,284,000 1,283,000 1,521,000 1,222,000 1,188,000 1,191,000 1,013,000 345,000 326,000 385,000 396,000 357,000 333,000 387,000          
          change in fair value of derivative instrument
                                                                                                 
          goodwill impairment
            426,967,000 50,154,000                                                                                 
          deferred income taxes
        -9,390,000 -6,225,000 -6,082,000 -6,432,000 -5,319,000 -7,429,000 -7,742,000 -17,077,000 -10,419,000 -14,119,000 -9,955,000 -11,456,000 -15,597,000 -32,472,000 -2,673,000 -3,290,000 -1,588,000 -4,823,000 -3,374,000 -2,896,000 -13,366,000 -3,814,000 -2,902,000 -3,722,000 -1,341,000 -5,535,000 -3,775,000 830,000 -5,775,000 -5,378,000 -7,983,000 -14,306,000 -27,742,000 -82,707,000 -8,771,000 -8,564,000 27,249,000 -12,929,000 -14,000,000 -11,328,000 -49,102,000 2,815,000 3,927,000 239,000 585,000 391,000 351,000 1,409,000 955,000 2,436,000 1,205,000 618,000 -2,328,000 2,327,000 1,476,000 2,434,000 2,179,000 2,095,000 933,000 230,000 3,532,000 -2,411,000 1,164,000 1,174,000 2,861,000 320,000 1,175,000 833,000 6,429,000 935,000 794,000 67,000 -1,674,000 154,000 -139,000 -153,000  -492,000 173,000 145,000 468,000 902,000 704,000 303,000 165,000 381,000 -480,000 153,000 -675,000 
          loss in equity investment
        -20,000                                                                                        
          other gains
            2,545,000 4,686,000           10,000 -11,000         -4,000 -81,000    -206,000  -664,000 116,000 616,000             -17,000 -62,000 -7,000 13,000 5,000 -28,000 7,000                                  
          changes in assets and liabilities
                                                                                                 
          accounts receivable and unbilled costs
        83,006,000 -104,399,000 -37,966,000 71,804,000 51,038,000 -96,071,000 10,982,000 62,715,000 29,411,000 -68,835,000 -44,517,000 35,565,000 71,998,000 -75,951,000 -26,416,000 35,266,000 85,533,000 -71,146,000 -16,838,000 51,773,000 10,156,000 -37,918,000 -30,512,000 75,152,000 31,026,000 -42,491,000 -42,155,000 75,092,000 11,748,000 -63,253,000 -18,614,000 47,939,000 37,513,000 -34,841,000 -27,292,000 109,572,000 -9,478,000 -45,238,000 -44,121,000 50,757,000 3,275,000                                                 
          inventories
                1,243,000 577,000 393,000 -1,604,000 684,000 5,578,000 -1,411,000 4,156,000 -6,731,000 4,216,000 -6,613,000 1,132,000 3,040,000 389,000 72,000 -5,544,000 2,734,000 1,251,000 -1,276,000 -1,208,000 2,638,000 1,791,000 1,030,000 -138,000 2,228,000 -174,000 3,689,000 -4,737,000 14,999,000 -2,782,000 3,953,000 -3,714,000 356,000 -2,001,000 8,974,000 -1,806,000 -1,858,000 4,230,000 -3,483,000 612,000 -1,452,000 -400,000 212,000 -5,158,000 -135,000 2,473,000 -849,000 -56,000 1,393,000 -337,000 -1,282,000 -666,000 23,000 2,464,000 -1,448,000 -783,000 -430,000 -1,301,000 -328,000 -112,000 1,145,000 -859,000 5,154,000 -507,000 -1,997,000 -798,000 86,000 -370,000  -103,000 63,000 -1,570,000 1,170,000 269,000 -1,391,000 -9,000 -1,000 -164,000 36,000 381,000 -393,000 
          prepaid expenses and other assets
        1,468,000 12,944,000 -2,322,000 -1,183,000 -8,972,000 11,385,000 -8,849,000 4,152,000 748,000 1,083,000 -6,509,000 -1,157,000 760,000 19,862,000 -4,790,000 -10,793,000 -11,970,000 6,051,000 334,000 -7,416,000 9,162,000 6,651,000 -4,163,000 -167,000 2,882,000 -332,000 7,051,000 4,238,000 -2,548,000 831,000 8,177,000 -3,426,000 -9,177,000 30,992,000 -516,000 -1,152,000 -32,338,000 15,360,000 -2,344,000 -5,429,000 6,862,000 408,000 -43,405,000 6,654,000 -2,026,000 3,224,000 -5,420,000 2,053,000 -4,186,000 1,685,000 -1,084,000 744,000 9,749,000 -927,000 -3,573,000 142,000 -75,000 -1,263,000                                
          accounts payable
        5,160,000 3,016,000 297,000 -3,752,000 3,725,000 31,000 -2,202,000 1,686,000 -877,000 125,000 922,000 -2,031,000 1,580,000 -6,392,000 1,746,000 -2,483,000 3,367,000 1,157,000 771,000 -1,084,000 -1,145,000 750,000 1,084,000 -2,423,000 359,000 -14,746,000 10,733,000 -634,000 -4,458,000 10,100,000 -4,312,000 -5,206,000 -3,551,000 2,714,000 -966,000 -7,126,000 -2,040,000 -1,969,000 -444,000 4,858,000 -11,336,000 18,682,000 -3,383,000 -1,629,000 2,055,000 526,000 332,000 -1,558,000 2,753,000 256,000 -3,481,000 1,970,000 792,000 -4,436,000 385,000 914,000 557,000 -1,423,000 1,818,000 -3,147,000 4,369,000 -894,000 -2,106,000 1,214,000 -2,337,000 366,000 1,172,000 561,000 -303,000 -638,000 7,000 -1,888,000 -4,820,000 1,296,000 1,534,000 -50,000 224,000 -1,271,000 1,601,000 -258,000 -91,000 -663,000 957,000 4,000 -154,000 811,000 -572,000 451,000 69,000 
          accrued compensation and other expenses
        16,142,000 16,892,000 12,200,000 -10,116,000 11,371,000 15,422,000 -15,004,000 8,740,000 12,466,000 3,681,000 -12,174,000 -37,677,000 19,875,000 11,758,000 4,210,000 -23,772,000 15,829,000 4,315,000 11,679,000 -29,432,000 9,261,000 13,210,000 22,705,000 -13,221,000 16,803,000 20,379,000 11,962,000 -16,332,000 -8,421,000 12,972,000 9,847,000 5,566,000 1,166,000 -10,804,000 12,707,000 -20,787,000 3,859,000 16,967,000 4,067,000 -18,108,000 -1,986,000 23,381,000 32,810,000 -20,955,000 3,101,000 9,460,000 12,266,000 -11,594,000 4,475,000 8,140,000 6,118,000 -11,999,000 4,339,000 6,624,000 4,494,000 -4,718,000 3,040,000 3,802,000 4,063,000 -9,268,000 2,947,000 2,992,000 4,213,000 -6,714,000 1,845,000 5,161,000 201,000 -11,173,000 -1,235,000 5,461,000 -1,931,000 -5,192,000 -4,346,000 659,000 1,465,000 -323,000 2,413,000 1,206,000 -1,308,000 -1,385,000 1,250,000 1,174,000 155,000 177,000 945,000 941,000 123,000 731,000 692,000 
          operating lease liabilities
        -2,559,000 -3,399,000 -2,652,000 -2,974,000 -2,940,000 -3,359,000 -2,893,000 -3,022,000 -2,982,000 -3,062,000 -3,001,000 -2,907,000 -2,866,000 -2,933,000 -3,043,000 -3,085,000 -3,205,000 -3,264,000 -2,607,000 -2,984,000 -2,384,000 -2,755,000 -2,534,000 -2,634,000 -3,387,000 -3,125,000 -3,140,000 -3,425,000                                                              
          income taxes payable
        522,000 139,000 66,000 492,000 379,000 -490,000 259,000 -65,000 -989,000 317,000 -231,000 -2,717,000 2,840,000 1,708,000 -2,776,000 -1,607,000 -1,226,000 364,000 -764,000 -1,461,000 6,494,000 361,000 207,000 -378,000 -943,000 72,000 -133,000 85,000 1,115,000 5,000 123,000 -1,882,000 -1,448,000 -3,055,000 1,584,000 185,000 5,079,000 25,000 -2,091,000 -5,000 2,091,000 -147,000 40,000 107,000 -791,000 86,000 705,000 -114,000             -6,196,000 1,416,000 1,658,000 1,420,000 -3,374,000 2,903,000 883,000 225,000 226,000 459,000 -429,000 617,000 -744,000 -199,000 668,000 467,000        
          deferred revenue
        11,955,000 58,897,000 -17,716,000 -3,983,000 37,141,000 32,766,000 -20,489,000 -32,095,000 14,051,000 23,569,000 -8,554,000 -36,251,000 -3,689,000 33,238,000 -12,538,000 -39,610,000 44,877,000 70,134,000 -10,540,000 -13,334,000 19,442,000 17,730,000 -14,008,000 -25,471,000 9,467,000 34,142,000 -10,529,000 -24,917,000 21,294,000 38,965,000 -13,740,000 -31,387,000 5,115,000 35,811,000 -9,543,000 -39,521,000 18,790,000 32,942,000 -1,272,000 -17,385,000 57,155,000 44,780,000 -61,969,000 -14,321,000 15,842,000 17,110,000 -7,089,000 -9,193,000 9,655,000 14,675,000 -8,267,000 -3,149,000 7,702,000 14,180,000 -8,912,000 -5,375,000 17,088,000 3,453,000 -606,000 -9,627,000 5,612,000 7,335,000 -3,695,000 -11,318,000 16,544,000 14,989,000 -4,728,000 -4,515,000 2,946,000 11,668,000 -15,521,000 -362,000 22,562,000 12,105,000 22,000 -188,000  1,215,000 -1,235,000 14,000 3,251,000 2,334,000 -1,289,000 -272,000 1,959,000 908,000 -333,000 -551,000 2,355,000 
          net cash from operating activities
        152,259,000 62,073,000 6,654,000 73,552,000 141,521,000 41,450,000 -3,729,000 38,428,000 93,578,000 13,964,000 -26,363,000 -22,368,000 112,727,000 46,312,000 10,132,000 -12,521,000 155,626,000 93,048,000 23,283,000 24,056,000 92,018,000 65,257,000 11,715,000 44,931,000 107,233,000 69,334,000 -1,002,000 49,458,000 80,324,000 36,808,000 7,186,000 25,520,000 73,536,000 76,857,000 19,426,000 52,635,000 95,883,000 78,325,000 15,868,000 37,733,000 38,687,000 49,655,000 -2,347,000 9,290,000 49,611,000 28,332,000 790,000 28,200,000 50,179,000 33,666,000 8,488,000 18,613,000 28,434,000 10,488,000 20,366,000 36,124,000 24,424,000 25,955,000 11,609,000 6,319,000 22,481,000 14,124,000 8,078,000 23,854,000 20,075,000 10,065,000 7,276,000 9,808,000 19,921,000 11,763,000 1,700,000 11,012,000 21,916,000 4,614,000 3,601,000 6,205,000 6,525,000 3,875,000 1,392,000 2,627,000 11,036,000 346,000 1,467,000 2,774,000 5,125,000 1,574,000 2,411,000 1,347,000 1,700,000 
          capital expenditures
        1,090,000 186,000 -389,000 457,000 143,000 232,000 -167,000 253,000 -256,000 14,000 354,000 46,000 -566,000 333,000 -93,000 382,000 -164,000 118,000 167,000 76,000 102,000 -374,000 296,000 309,000 136,000 -119,000 -556,000 794,000 -737,000 -739,000 1,875,000  1,064,000 705,000 -1,004,000 477,000 109,000 580,000 -953,000 84,000 -1,858,000 285,000 -214,000 245,000 -567,000 260,000 25,000 95,000 -109,000 297,000 -67,000 3,000 -216,000 -120,000 258,000 232,000 385,000 88,000 -552,000 648,000 -186,000   -276,000 -549,000 -417,000 -588,000 
          free cash flows
        153,349,000 62,259,000 6,265,000 74,009,000 141,664,000 41,682,000 -3,896,000 38,681,000 93,322,000 13,978,000 -26,009,000 -22,322,000 112,161,000 46,645,000 10,039,000 -12,139,000 155,462,000 93,166,000 23,450,000 24,132,000 92,120,000 64,883,000 12,011,000 45,240,000 107,369,000 69,215,000 -1,558,000 50,252,000 79,587,000 36,069,000 9,061,000  74,600,000 77,562,000 18,422,000 53,112,000 95,992,000 78,905,000 14,915,000 37,817,000 36,829,000 49,940,000 -2,561,000 9,535,000 49,044,000 28,592,000 815,000 28,295,000 50,070,000 33,963,000 8,421,000 18,616,000 28,218,000 10,368,000 20,624,000 36,356,000 24,809,000 26,043,000 11,057,000 6,967,000 22,481,000 14,124,000 8,078,000 23,854,000 20,075,000 9,879,000 7,276,000 9,808,000 19,921,000 11,763,000 1,700,000  21,916,000 4,614,000 3,601,000  6,525,000 3,599,000 843,000 2,210,000 10,448,000 346,000 1,467,000 2,774,000 5,125,000 1,574,000 2,411,000 1,347,000 1,700,000 
          cash flows from investing activities:
                                                                                                 
          purchase of marketable securities
                    -14,248,000 -39,351,000 -33,223,000 -27,691,000 -67,024,000 -5,647,000 -5,696,000 -1,699,000 -7,194,000 -1,037,000 -5,743,000 -27,543,000 -6,338,000 -42,463,000 -41,039,000 -45,665,000 -48,085,000 -66,808,000 -69,211,000 -42,855,000 -13,547,000 -22,363,000 -35,413,000 -64,104,000 -82,237,000 -17,694,000 -35,806,000 -25,611,000 -33,123,000 -9,255,000 -32,289,000 -54,665,000 -20,757,000 -15,284,000 -42,506,000 -39,320,000 -45,052,000 -25,669,000 -18,081,000 -18,655,000 -21,423,000 -22,384,000 -58,671,000 -28,313,000 -21,989,000 -26,785,000 -40,595,000 -104,310,000 -20,447,000 -26,881,000 -2,265,000 -28,580,000 -31,409,000 -19,472,000 -13,458,000 -3,072,000 -21,264,000 -4,663,000 -1,327,000 -16,123,000 -406,000 -2,955,000 -13,011,000 -60,614,000 -11,173,000 -14,774,000 -17,622,000  -30,762,000 -25,757,000  -27,792,000 -16,899,000 -14,958,000  
          proceeds from maturity of marketable securities
                                   28,995,000 75,087,000 61,289,000 52,484,000 41,573,000 16,023,000 24,277,000 108,423,000 47,318,000 36,384,000 58,084,000 33,694,000 53,159,000 30,029,000 23,132,000 46,686,000 19,034,000 28,765,000 24,985,000 22,406,000 13,798,000 16,165,000 16,022,000 21,271,000 12,112,000 10,370,000 50,754,000 51,410,000 50,882,000 23,534,000 27,526,000 101,586,000 32,253,000 32,269,000 13,501,000 38,256,000 17,404,000  4,626,000 27,214,000 1,128,000 4,097,000 9,734,000 556,000 3,062,000 898,000 48,147,000 18,617,000 1,615,000  20,798,000 19,061,000 4,613,000 12,045,000 23,751,000 29,729,000 8,794,000 27,918,000 22,333,000 22,970,000 24,884,000 39,011,000 
          purchase of fixed assets
        -2,186,000 -2,815,000 -2,233,000 -1,878,000 -1,398,000 -1,859,000 -882,000 -1,268,000 -1,597,000 -1,249,000 -1,535,000 -1,956,000 -2,106,000 -3,166,000 -3,014,000 -2,201,000 -3,346,000 -2,703,000 -1,723,000 -2,578,000 -2,876,000 -3,341,000 -3,164,000 -2,605,000 -4,715,000 -6,151,000 -5,769,000 -3,287,000 -3,930,000 -7,255,000 -5,739,000 -6,468,000 -3,561,000 -4,798,000 -4,257,000 -3,297,000 -7,997,000 -5,951,000 -6,530,000 -9,218,000 -10,776,000 -4,894,000 -5,698,000 -3,415,000 -4,178,000 -4,614,000 -2,151,000 -1,865,000 -4,357,000 -2,201,000 -4,128,000 -2,380,000 -3,636,000 -3,640,000 -1,951,000 -2,721,000 -3,436,000 -2,060,000 -2,085,000 -3,707,000 -3,309,000 -1,572,000 -1,865,000 -2,093,000 -2,081,000 -1,531,000 -1,228,000 -1,972,000 -1,264,000 -781,000 -1,624,000 -1,297,000 -1,425,000 -884,000 -1,568,000 -981,000 -697,000 -355,000 -657,000 -474,000 -353,000 -591,000 -1,222,000 -1,013,000 -580,000 -1,174,000 -816,000 -848,000 -436,000 
          purchase of intangible assets
                  -161,000     -300,000 -4,237,000         -39,000   -9,000 -2,000 -1,000,000 -20,000 -3,808,000 -2,000 -64,000 -88,000 -43,000 -39,000 -21,000 -71,000 -373,000                                         
          proceeds from sale of equity investment
                                                                                               
          proceeds from divestiture of a business
                -517,000                                                                                
          net cash from investing activities
        -75,466,000 -4,798,000 4,725,000 -17,291,000  1,190,000 3,945,000 -3,094,000 -71,000 20,402,000 12,156,000 -19,129,000 20,951,000 -20,497,000 -7,672,000 22,522,000 -65,298,000 -703,000 -2,320,000 -32,000 508,000 -3,924,000 7,571,000 20,543,000 -3,492,000 -2,248,000 20,916,000 -19,485,000 25,108,000 5,817,000 -23,075,000 -34,102,000 -30,737,000 5,850,000 73,461,000 8,554,000 -35,694,000 -22,415,000 2,932,000 12,896,000 -10,213,000 -7,356,000 59,416,000 -16,758,000 -30,169,000 -423,000 5,034,000 -30,627,000 -27,799,000 -31,945,000 -8,442,000 -8,395,000 -11,921,000 -11,039,000 11,728,000 -10,510,000 -8,215,000 -26,299,000 72,716,000 -28,994,000 -75,350,000 -8,518,000 9,510,000 13,046,000 -24,565,000 -28,500,000 6,292,000 -14,302,000 -239,000 -12,311,000 -5,731,000 438,000 -17,179,000 15,928,000 14,459,000 -12,742,000 -57,172,000 8,994,000 3,081,000 -13,900,000 -5,906,000 22,268,000 -2,283,000 -27,418,000 18,414,000 -6,633,000 5,255,000 9,078,000 -6,308,000 
          cash flows from financing activities:
                                                                                                 
          issuance of common stock under stock plans
        1,000 1,000 1,000 2,000 1,000 2,000 1,000 1,000   1,000     1,000      1,000     35,000 38,000 59,000 8,000 57,000 440,000 102,000 213,000 59,000 161,000 341,000 14,000                                  
          treasury stock repurchases
        -29,233,000 -1,000 -16,551,000 -15,014,000  -257,000 -25,000,000         -1,000 -11,239,000       -25,000,000 -69,292,000 -30,708,000      -100,000,000 -100,000,000 -1,422,000 -4,918,000 -33,147,000 -50,068,000 -99,424,000 -27,431,000 -181,828,000 -3,167,000 -20,171,000 -649,000 -18,707,000 -12,187,000 -9,289,000 -8,684,000 -8,879,000 -7,470,000 -6,721,000 -6,586,000 -7,728,000 -6,413,000 -2,656,000 -142,000                                
          tax withholding on restricted stock units
          -1,432,000 -13,765,000 -133,000 -330,000 -1,340,000 -12,159,000 -204,000 -433,000 -5,312,000 -13,406,000 -206,000 -180,000 -8,199,000 -10,808,000 -445,000 -249,000 -10,220,000 -4,777,000 -518,000 -168,000 -9,497,000 -3,103,000 -260,000 -235,000 -8,365,000 -3,012,000 -554,000 -1,561,000 -6,368,000 -3,486,000 -641,000 -1,930,000 -5,646,000 -5,381,000                                                      
          payment of debt issuance costs
            -345,000                                                                                   
          repayment of long-term debt
            -75,000,000 -75,000,000 -25,000,000     -100,000,000 -150,000,000       -50,000,000 -50,000,000                            -60,606,000 -3,750,000 -3,750,000 -3,750,000 -2,500,000 -2,500,000 -2,500,000 -2,500,000 -2,500,000 -5,644,000 -2,500,000 -2,500,000 -1,250,000 -1,250,000 -1,250,000 -1,250,000                 
          proceeds from issuance of long-term debt
                                                                                              
          net cash from financing activities
        -29,441,000 -490,000 -17,982,000 -28,778,000 -75,477,000 -2,780,000 -1,597,000 -62,157,000   -36,449,000 -13,404,000 -100,206,000 -180,000 -8,198,000 -310,846,000 -446,000 -10,651,000 -38,291,000 -4,777,000 -101,266,000 -3,442,000 -9,496,000 -4,103,000 -50,260,000 -25,235,000 -127,655,000 -83,720,000 -65,021,000 -3,889,000 -6,889,000 -3,486,000 -7,346,000 -1,929,000 -106,306,000 -105,381,000 -1,376,000 -4,635,000 -34,519,000 -50,068,000 -49,284,000 -27,344,000 64,495,000 -3,167,000 -21,644,000 -322,000 -16,046,000 -10,748,000 -8,883,000 -7,938,000 -7,771,000 -7,371,000 -7,530,000 -68,911,000 -6,702,000 -7,861,000 -1,716,000 -743,000 -19,939,000 -5,020,000 -1,445,000 1,833,000 -1,608,000 -2,159,000 1,288,000 261,000 -4,603,000 -1,995,000 -667,000 -1,049,000 134,000 267,000 -925,000 -92,000 1,213,000 262,000 -579,000 1,174,000 -364,000 1,596,000 268,000 958,000 24,000 1,072,000 31,000 689,000 112,000 656,000 465,000 
          effect of exchange rate changes on cash and cash equivalents
        -1,495,000 477,000 411,000 4,674,000 2,047,000 -4,854,000 2,523,000 -638,000 -1,284,000 2,640,000 -2,116,000 823,000 1,278,000 6,084,000 -6,439,000 -2,814,000 -1,826,000 -2,059,000 -1,370,000 745,000 -2,587,000 4,145,000 2,623,000 2,446,000 -1,904,000 745,000 -1,105,000 -1,163,000 168,000 -1,865,000 822,000 -4,337,000 2,456,000 -370,000 3,251,000 1,048,000 1,234,000 -1,865,000 272,000 -402,000 1,000,000 27,000 -377,000 94,000 391,000 131,000 234,000 73,000 -69,000 -52,000 -85,000 -50,000 111,000 -88,000 -31,000 17,000             3,000 -9,000 -1,000 289,000 393,000                 
          net increase in cash and cash equivalents
        45,857,000 57,262,000 -6,192,000 32,157,000 59,054,000        34,750,000 31,719,000 -12,177,000 -303,659,000             40,579,000    37,909,000   -43,144,000 60,047,000 49,410,000 -15,447,000 159,000 -19,810,000 14,982,000   -1,811,000   -13,102,000   -7,810,000 2,797,000 9,094,000 -69,550,000 25,361,000 17,770,000 14,493,000 -1,097,000 64,386,000 -27,695,000 -54,314,000 7,439,000 15,980,000 34,741,000 -3,202,000 -18,174,000 8,965,000 -6,489,000 19,018,000 -1,606,000   4,205,000 20,574,000       5,398,000 23,572,000 -792,000 -23,572,000 23,570,000 -4,370,000 7,778,000 11,081,000 -4,143,000 
          cash and cash equivalents, beginning of year
                                                                                            19,011,000 
          cash and cash equivalents, end of year
                                                                                                 
          supplemental disclosures of cash flow information:
                                                                                                 
          cash paid for interest
            397,000 1,100,000 1,256,000 1,437,000 1,610,000 1,625,000 1,605,000 1,587,000 2,712,000 2,350,000 1,691,000 1,310,000 1,246,000 1,176,000 1,147,000 1,393,000 1,582,000 1,926,000 1,879,000 2,298,000 3,625,000 3,852,000 4,528,000 5,639,000                         80,000 -3,000 248,000 245,000 166,000                     1,000 5,000 3,000 5,000 9,000 2,000 2,000 111,000 11,000 -4,000 
          cash paid for income taxes
        11,734,000 10,942,000 11,517,000 8,530,000 9,599,000 10,021,000 13,033,000 9,143,000 7,837,000 13,231,000 19,419,000 21,831,000 8,630,000 17,160,000 16,955,000 13,179,000 7,025,000 5,714,000 6,233,000 12,730,000 2,940,000 3,155,000 3,903,000 1,474,000 2,567,000 3,262,000 4,021,000 3,211,000                2,967,000 8,403,000 5,243,000 9,445,000 6,142,000 8,828,000 4,706,000 4,127,000 3,795,000 866,000 4,286,000 7,201,000 973,000 3,515,000 5,714,000                     303,000 496,000 267,000 110,000 111,000 177,000 333,000 28,000 122,000 129,000 -51,000 
          non-cash transactions:
                                                                                                 
          transfers of inventory to fixed assets
        517,000 740,000 137,000 476,000 375,000 645,000 700,000 1,114,000 159,000 1,212,000 1,708,000 949,000 1,039,000 491,000 1,428,000 862,000 563,000 1,589,000 1,294,000 4,262,000 2,255,000 2,673,000 -626,000 167,000 459,000 1,229,000 940,000 1,781,000 583,000                                
          additions to property, plant and equipment included in accounts payable
        1,090,000 186,000 -389,000 457,000 143,000 232,000 -167,000 253,000 -256,000 14,000 354,000 46,000 -566,000 333,000 -93,000 382,000 -164,000 118,000 167,000 76,000 102,000 -374,000 296,000 309,000 136,000 -119,000 -556,000 794,000 -735,000 -739,000 1,875,000 54,000 1,065,000 731,000 -939,000 522,000 184,000 695,000 -12,000 374,000 -1,381,000 285,000 -214,000 245,000 -567,000 260,000 25,000 95,000 -109,000 297,000 -67,000 3,000 -216,000 -120,000 258,000 232,000 385,000 88,000 -552,000 648,000                              
          issuance of common stock under employee stock plans
        6,773,000                                       2,321,000                                    
          stock-based compensation included in fixed assets and other assets
                                                                                                 
          adjustments to reconcile net income to cash from operating activities:
                                                                                                 
          operating lease right-of-use asset amortization
         2,467,000 2,507,000 2,497,000  2,625,000 2,621,000 2,606,000                                                                                  
          share-based compensation expense
         13,833,000 13,557,000 19,959,000  14,502,000 14,886,000 21,198,000  16,364,000 18,445,000 19,844,000  15,143,000 16,501,000 15,581,000  12,681,000 16,735,000 13,965,000  12,517,000 15,736,000 12,096,000  11,361,000 15,857,000 12,743,000  13,759,000                                                            
          other loss
                                                                                                 
          inventories and deferred costs
         -759,000 1,085,000 -1,053,000  1,753,000 -1,646,000 -1,567,000                                                                                  
          purchase of marketable securities and investments
         -18,723,000 -21,558,000 -29,031,000 -15,713,000 -8,349,000 -8,848,000 -12,151,000 -9,615,000 -1,239,000 -16,015,000 -25,905,000                                                                              
          proceeds from sales and maturity of marketable securities
         16,740,000 16,744,000 13,618,000  11,398,000 14,965,000 10,325,000  23,407,000 21,429,000 8,733,000  22,021,000 28,561,000 52,570,000  1,998,000 5,036,000 8,230,000  6,612,000 12,068,000 33,026,000  10,266,000                                                                
          tax withholdings on restricted stock units
                                                                                                 
          cash and cash equivalents, beginning of period
         457,415,000  389,674,000  386,794,000  636,161,000                      210,711,000  104,893,000  102,076,000  99,930,000  117,255,000  67,168,000  63,322,000  82,222,000  56,702,000  18,925,000  61,676,000  57,070,000      
          cash and cash equivalents, end of period
         57,262,000 -6,192,000 489,572,000  35,006,000 1,142,000 362,213,000  17,711,000 -52,772,000 332,716,000  31,719,000 -12,177,000 332,502,000                      49,410,000 -15,447,000 210,870,000  14,982,000 121,187,000 94,352,000  27,718,000 -9,988,000 88,974,000  -6,269,000 -7,810,000 102,727,000  -69,550,000 25,361,000 135,025,000  -1,097,000 64,386,000 39,473,000  7,439,000 15,980,000 98,063,000  -18,174,000 8,965,000 75,733,000  -1,606,000 -3,898,000 68,708,000  20,574,000 19,273,000 12,650,000  14,043,000 4,109,000 51,999,000  23,572,000 -792,000 33,498,000  -4,370,000 7,778,000 30,092,000  
          supplemental disclosures:
                                                                                                 
          net loss
           -3,679,000    -443,376,000    -4,200,000    -7,132,000   7,896,000 -11,341,000   -3,686,000 -17,420,000  36,725,000 -17,472,000 -29,343,000   -26,428,000 -62,504,000   -2,468,000 -24,222,000                                                     -177,000 
          adjustments to reconcile net loss to cash from operating activities:
                                                                                                 
          gain in equity investment
           -2,490,000                                                                                      
          adjustments to reconcile net income (loss) to cash from operating activities, net of the effects of acquisitions:
                                                                                                 
          net cash (used in) provided by investing activities
                                                                                                 
          treasury stock repurchases, including accelerated share repurchases
                -18,863,000    -150,039,000                                                                          
          issuance of common stock under employee stock purchase plans
                                                                                                 
          change in fair value of derivative investment
                 -206,000                                                                              
          adjustments to reconcile net income (loss) to cash from operating activities:
                                                                                                 
          net decrease in cash and cash equivalents
              1,142,000 -27,461,000  17,711,000 -52,772,000 -54,078,000                   -21,956,000 -16,405,000            -10,541,000                            12,006,000    -6,275,000   4,109,000 -9,677,000          
          unsettled share repurchases, included in accounts payable
                                   2,469,000                                                              
          other losses
               -8,839,000    363,000        217,000    45,000 -187,000    54,000 2,000         -220,000 -17,000 -287,000 -53,000 19,000 42,000  -1,000 57,000 28,000          32,000                                
          net change in fair value of contingent and contractual liabilities
                                257,000 541,000                 -1,000 -9,000 -14,000 -11,000 -14,000 -264,000 66,000 44,000 221,000 135,000                                  
          decrease in deposits
                -18,000 -6,000 -1,000 -5,000 -1,000 4,000 5,000 -183,000 2,000 14,000 12,000 -17,000 -1,000 4,000 102,000       -101,000 4,000 -304,000 -56,000   107,000    -125,000 -24,000   -48,000 2,000 84,000 17,000 86,000 -1,000                                        
          collection of contingent consideration
                                                                                                 
          net cash used in financing activities
                -204,000                                                                                 
          adjustments to reconcile net loss to cash from operating activities, net of the effects of acquisitions:
                                                                                                 
          payment of contingent consideration
                            -748,000 -1,000,000     -2,328,000                 -841,000 -841,000 -841,000 -840,000 -1,516,000                                  
          cash and cash equivalents and restricted cash, beginning of year
                                                                                                 
          cash and cash equivalents and restricted cash, end of year
                                                                                                 
          change in fair value of contingent consideration
                                                                                                 
          accretion of contingent consideration
                                -12,000 -6,000 -18,000 -55,000 -54,000                                                            
          acquisition of businesses, net of cash acquired
                                            -1,000 -47,000           -36,273,000                                   
          contingent consideration related to acquisition, included in accrued other
                                800,000 1,000,000                                                          
          net increase in cash and cash equivalents and restricted cash
                         79,635,000 -18,698,000 19,992,000  62,036,000 12,413,000 63,817,000                                                                  
          cash and cash equivalents and restricted cash, beginning of period
                         467,176,000  340,237,000  409,820,000  370,731,000  305,726,000                                                      
          cash and cash equivalents and restricted cash, end of period
                         79,635,000 -18,698,000 487,168,000  62,036,000 12,413,000 404,054,000  42,596,000 -108,846,000 354,910,000  36,871,000 -21,956,000 354,326,000  80,408,000 -10,168,000 262,582,000                                                      
          loss on divestiture of business
                                    270,000                                                            
          deal related compensation expense and accretion charges
                                                38,000 38,000 6,615,000 37,000 39,000 38,000 38,000 38,000 37,000 41,000 37,000 36,000 58,000 65,000 64,000 76,000                                  
          impairment charge
                                                                                                 
          due from related party
                                    1,000 -1,548,000 183,000 1,536,000 -111,000   376,000 1,909,000 24,754,000 -1,984,000 -12,706,000 23,101,000                                                
          due to related party
                                    2,000 235,000 -253,000 250,000 7,000 -250,000 190,000 -22,000 -2,286,000 2,073,000 -3,283,000 704,000 -2,414,000 -11,842,000                                                
          payments related to the divestiture of business
                                    -382,000                                                            
          capitalized software development costs
                                    -2,000    -1,000 -26,000 -65,000 -45,000 -75,000 -115,000 -941,000 -290,000 -477,000                        -186,000           -15,000          
          tenant improvement allowance
                                    3,383,000 6,788,000                                                          
          initial fair value of contingent consideration received as partial consideration for divestiture of business
                                                                                                 
          acquisition of businesses
                                 -4,154,000                                                              
          increase in deposits
                                -2,000 -25,000          -9,000   9,000 -62,000            -46,000 -457,000                                    
          contingent purchase consideration
                                                                                             
          proceeds from issuance of long-term debt, net of issuance costs
                                                50,000,000                              -68,000                 
          deal-related compensation expense and accretion charges
                                     26,000 38,000 38,000  38,000 38,000 38,000  38,000 38,000 38,000                                                  
          impairment of intangible assets
                                     35,871,000                                                          
          net decrease in cash and cash equivalents and restricted cash
                                 42,596,000 -108,846,000 -54,910,000                                                              
          fair value of contingent consideration received as partial consideration for divestiture of business
                                                                                                
          collection of contingently returnable consideration
                                            7,731,000 5,133,000 556,000                                                 
          contingent consideration related to acquisition
                                                                                                 
          debt issuance costs settled through the issuance of additional debt
                                                                                              
          purchase consideration
                                                21,000 -3,675,000                                                
          contingently returnable consideration
                                                -21,000 3,675,000                                                
          collection of contingently returnable consideration from related party
                                                                                                 
          change in restricted cash
                                                                                               
          excess tax benefit (shortfall) from share-based compensation awards
                                                                                                 
          excess tax benefit from share-based compensation awards
                                             282,000   140,000 87,000   -1,508,000 289,000 2,602,000 1,431,000 349,000 306,000 1,006,000 727,000 -27,000 355,000 1,525,000 54,000                                  
          gross increase in contingently returnable consideration asset relating to fair value adjustment
                                                                                                 
          gross decrease in contractual liability relating to fair value adjustment
                                                     -49,000  -50,000 -49,000 -49,000 -49,000 -135,000                                  
          gross increase in contingent consideration liability relating to fair value adjustment
                                                    40,000 35,000 39,000 35,000 -215,000 115,000 44,000 221,000 270,000                                  
          accounts receivable
                                                  28,966,000 23,729,000 1,172,000 -33,657,000 -16,867,000 27,551,000 13,753,000 -18,573,000 -4,717,000 22,988,000 -12,048,000 -28,722,000 9,941,000 30,911,000 -20,186,000 2,606,000 -8,316,000 21,899,000 -6,009,000 -15,344,000 -1,130,000 25,238,000 -7,906,000 -24,491,000 -4,143,000 10,811,000 6,152,000 -20,073,000 527,000 5,615,000 16,692,000 -9,139,000 -2,815,000 2,423,000 -1,849,000 1,445,000 -2,892,000 1,744,000 2,233,000 -6,794,000 -1,097,000 779,000 1,286,000 -3,519,000 1,868,000 -670,000  
          gross (decrease) in contractual liability relating to fair value adjustment
                                                                                                 
          contingent liabilities
                                                                                                 
          fair value of contingent consideration related to acquisitions, included in contingent liabilities
                                                                                                 
          interest settled through issuance of additional debt
                                                                                                
          supplemental disclosure of non-cash activities:
                                                                                                 
          contingent consideration related to acquisitions, included in contigent liabilities
                                                                                                 
          acquisition related compensation expense and accretion charges
                                                                                                 
          effect of exchange rate changes on cash and cash equivalants
                                                                                                 
          decrease in contractual non-compliance liability relating to fair value adjustment
                                                                                                 
          increase in contingent liability relating to fair value adjustment
                                                                                                 
          proceeds from the exercise of stock options
                                                                 68,000 50,000 146,000  1,570,000 450,000 143,000  1,719,000 423,000 86,000 2,032,000 125,000 1,196,000 1,220,000                  
          excess tax benefit from stock options exercised
                                                                 -754,000 132,000 10,000 4,835,000 2,763,000 442,000 198,000 2,977,000 1,042,000 618,000 419,000 -199,000 76,000 188,000 297,000                  
          contingent consideration related to acquisitions, included in contingent liabilities
                                                                                                 
          adjustments to reconcile net income to cash from operating activities, net of the effects of the acquisition of psytechnics:
                                                                                                 
          acquisition of psytechnics, net of cash acquired
                                                                  -16,945,000                              
          supplemental disclosure of cash flow information:
                                                                                                 
          prepaid income taxes
                                                                   -2,171,000 -3,205,000 2,386,000 -1,944,000 2,288,000 4,058,000                         
          prepaid expenses and other current assets
                                                                   603,000 108,000 -227,000 -174,000 914,000 -664,000 7,000 466,000 -189,000 729,000 -490,000 1,674,000 6,727,000 -1,546,000 -1,490,000 570,000 -28,000 -95,000 -1,087,000 771,000 161,000          
          other assets
                                                                   57,000 141,000 101,000 -12,000 28,000 -65,000 41,000 -186,000 185,000 49,000 259,000 111,000 379,000 653,000 1,709,000 -1,592,000 -53,000  -42,000 -16,000 3,000 3,000   -3,000 9,000 21,000 -3,000 9,000  
          repurchase of vested rsu’s
                                                                   -1,426,000                              
          inventory write-down
                                                                        129,000 -13,000 83,000 110,000 -40,000 189,000           135,000         
          changes in assets and liabilities, net of the effects of acquisitions
                                                                                                 
          proceeds from maturities and sales of marketable securities
                                                                                                 
          acquisition of network general, net of cash acquired
                                                                                -14,000                 
          capitalized expenditures for internal use software
                                                                                   -365,000  -276,000 -549,000 -402,000 -588,000         
          supplemental disclosure of non-cash investing and financing activities:
                                                                                                 
          common stock issued in connection with the acquisition of network general
                                                                                                
          issuance of debt in connection with the acquisition of network general
                                                                                                
          refundable income taxes
                                                                          -114,000 1,739,000 -2,638,000 -28,000 -94,000 -593,000 -3,758,000 -969,000 -25,000 373,000 -357,000 -102,000 4,000 783,000 334,000 100,000 58,000 -78,000 -168,000 180,000 761,000 -70,000 376,000 
          cumulative effect of accounting change
                                                                                    -111,000          
          tax benefit from stock options exercised
                                                                                  155,000 31,000 -76,000 562,000 216,000 111,000          
          purchase of treasury shares
                                                                                    -1,049,000 -417,000            
          changes in assets and liabilities , net of the effects of acquisitions
                                                                                                 
          supplemental disclosure of non-cash financing activities:
                                                                                                 
          amortization of deferred financing costs
                                                                              63,000 64,000 64,000                 
          proceeds from issuance of common stock
                                                                                  1,058,000 231,000  1,029,000 403,000 1,485,000 268,000 958,000 24,000 1,072,000 31,000 689,000 112,000 656,000 465,000 
          in-process research and development.
                                                                                                 
          acquisition of quantiva’s business
                                                                                         7,000        
          adjustments to reconcile net income to cash from operating activities, net of the effects of the acquisition of network general:
                                                                                                 
          inventory write down
                                                                                                 
          proceeds from exercise of stock options
                                                                                                 
          in-process research and development
                                                                                        143,000      
          loss on disposal of fixed assets.
                                                                                                 
          inventory write-down.
                                                                                                 
          deferred income taxes.
                                                                                                 
          changes in assets and liabilities net of the effects of the acquisition of quantiva’s business:
                                                                                                 
          inventories.
                                                                                                 
          other assets.
                                                                                                 
          deferred revenue.
                                                                                                 
          proceeds from maturity of marketable securities.
                                                                                                 
          capitalized expenditures for internal use software.
                                                                                                 
          proceeds from issuance of common stock.
                                                                                                 
          net increase in cash and cash equivalents.
                                                                                                 
          cash and cash equivalents, beginning of period.
                                                                                                 
          cash and cash equivalents, end of period.
                                                                                                 
          cash paid for income taxes.
                                                                                                 
          depreciation
                                                                                      741,000 679,000 745,000 793,000 718,000 613,000 794,000 717,000 649,000 558,000 842,000 
          amortization of other intangible assets
                                                                                      141,000 143,000  39,000 -48,000 119,000     
          amortization of capitalized software development costs
                                                                                                 
          adjustments to reconcile net income to cash from operating activities, net of the effects of the acquisition of quantiva’s business:
                                                                                                 
          amortization of capitalized software
                                                                                       34,000    166,000 166,000 165,000 166,000 166,000 165,000 
          changes in assets and liabilities:
                                                                                                 
          amortization of goodwill and other intangible assets
                                                                                                 
          prepaids and other current assets
                                                                                          850,000 71,000 -513,000 212,000 -414,000 -127,000 -140,000 
          purchases of marketable securities
                                                                                                 
          purchase of quantiva, inc. assets
                                                                                                 
          repurchase of common stock as treasury stock
                                                                                                 
          non-cash financing activities:
                                                                                                 
          tax benefits of disqualifying dispositions of incentive stock options recorded to additional paid-in capital
                                                                                        103,000 94,000 15,000 8,000 19,000     
          amortization of fas86 capitalized software
                                                                                                 
          stock-based compensation expense
                                                                                         146,000 115,000 79,000      
          capitalization of fas86 software
                                                                                                 
          amortization of capitalized software and expense related to acquired software
                                                                                                 
          adjustments to reconcile net income to cash from investing activities, net of the effects of the acquisition of quantiva’s business:
                                                                                                 
          acquisition of quantiva
                                                                                           -9,442,000      
          loss on write-off of note receivable
                                                                                                 
          compensation expense associated with equity awards
                                                                                                26,000 
          release of common stock held in escrow in connection with nextpoint acquisition
                                                                                                 
          tax benefits of disqualifying dispositions of incentive stock options
                                                                                              21,000 3,000 117,000 
          software development cost expenditures
                                                                                                
          amortization of goodwill
                                                                                                 
          accounts receivable,net
                                                                                                 
          purchase of common stock as treasury stock
                                                                                                
          release of common shares held in escrow in connection with nextpoint acquisition