7Baggers

AECOM
(NYSE:ACM) 

ACM stock logo

AECOM, together with its subsidiaries, delivers professional services to program and construction management in the Americas, Europe, the Middle East, Africa, and the Asia Pacific. It operates through three segments: Americas, International, and AECOM Capital. The company engages in planning, consul...

Founded: 1990
Full Time Employees: 54,000
Sector: Industrials
Industry: Engineering & Construction

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Quarterly
Annual
    Unit: USD2026-04-03 2026-01-02 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 2019-06-28 2019-03-31 2019-03-29 2018-12-31 2018-12-28 2018-06-30 2018-06-29 2018-03-31 2018-03-30 2017-12-29 2017-06-30 2017-03-31 2016-12-31 2016-12-30 2016-07-01 2016-04-01 2016-01-01 2015-06-30 2015-04-03 2015-01-02 2014-06-30 2014-03-31 2013-12-31 2013-06-30 2013-03-31 2012-12-31 2012-06-30 2012-03-31 2011-12-31 2011-06-30 2011-03-31 2010-12-31 2010-06-30 2010-03-31 2009-12-31 2009-06-30 2009-03-31 2008-12-31 2008-06-30 2008-03-31 2007-12-31 2007-09-30 2007-06-30 2007-03-31 
                                                                            
      revenue
    3,801,143,000 3,830,834,000 4,175,417,000 4,178,440,000 3,771,613,000 4,014,152,000 4,110,494,000 4,151,251,000 3,943,833,000 3,899,920,000 3,842,385,000 3,663,549,000 3,490,172,000 3,382,355,000 3,426,113,000 3,241,695,000 3,213,658,000 3,266,716,000 3,353,767,000 3,408,357,000 3,265,573,000 3,313,155,000 3,568,950,000 3,189,679,000 3,245,737,000 3,235,610,000 5,115,608,000 4,980,204,000 4,980,204,000 5,040,022,000 5,040,022,000 5,037,495,000 5,037,495,000 5,147,920,000 5,147,920,000 4,790,910,000 4,790,910,000 4,910,832,000 4,561,467,000 4,427,198,000 4,358,349,000 4,358,349,000 4,408,782,000 4,381,296,000 4,297,651,000 4,549,578,000 4,506,197,000 4,186,035,000 1,968,155,000 1,872,224,000 1,953,875,000 2,067,490,000 1,989,646,000 2,017,272,000 2,095,138,000 2,010,951,000 2,029,180,000 2,046,725,000 1,936,421,000 1,936,183,000 1,635,183,000 1,601,166,000 1,480,784,000 1,531,989,000 1,498,758,000 1,454,128,000 1,321,203,000 1,164,121,000 1,080,250,000 780,728,500 1,100,656,000 1,083,709,000 
      yoy
    0.78% -4.57% 1.58% 0.65% -4.37% 2.93% 6.98% 13.31% 13.00% 15.30% 12.15% 13.01% 8.60% 3.54% 2.16% -4.89% -1.59% -1.40% -6.03% 6.86% 0.61% 2.40% -30.23% -35.95% -34.83% -35.80% 1.50% -1.14% -1.14% -2.10% -2.10% 5.15% 5.15% 4.83% 12.86% 8.22% 9.92% 12.68% 3.46% 1.05% 1.41% -4.20% -2.16% 4.66% 118.36% 143.00% 130.63% 102.47% -1.08% -7.19% -6.74% 2.81% -1.95% -1.44% 8.20% 3.86% 24.09% 27.83% 30.77% 26.38% 9.10% 10.11% 12.08% 31.60% 38.74% 86.25% 20.04% 7.42%     
      qoq
    -0.78% -8.25% -0.07% 10.79% -6.04% -2.34% -0.98% 5.26% 1.13% 1.50% 4.88% 4.97% 3.19% -1.28% 5.69% 0.87% -1.62% -2.60% -1.60% 4.37% -1.44% -7.17% 11.89% -1.73% 0.31% -36.75% 2.72% 0.00% -1.19% 0.00% 0.05% 0.00% -2.15% 0.00% 7.45% 0.00% -2.44% 7.66% 3.03% 1.58% 0.00% -1.14% 0.63% 1.95% -5.54% 0.96% 7.65% 112.69% 5.12% -4.18% -5.50% 3.91% -1.37% -3.72% 4.19% -0.90% -0.86% 5.70% 0.01% 18.41% 2.12% 8.13% -3.34% 2.22% 3.07% 10.06% 13.49% 7.76% 38.36% -29.07% 1.56%  
      cost of revenue
    3,504,643,000 3,549,844,000 3,844,819,000 3,851,490,000 3,480,852,000 3,745,748,000 3,816,341,000 3,866,207,000 3,682,659,000 3,655,950,000 3,590,080,000 3,413,471,000 3,262,078,000 3,167,367,000 3,208,845,000 3,021,145,000 3,003,706,000 3,066,512,000 3,136,509,000 3,206,823,000 3,070,314,000 3,128,785,000 3,379,082,000 3,004,600,000 3,076,924,000 3,069,810,000 4,877,382,000 4,770,960,000 4,770,960,000 4,844,660,000 4,844,660,000 4,866,882,000 4,866,882,000 4,962,741,000 4,962,741,000 4,649,638,000 4,649,638,000 4,774,680,000 4,386,291,000 4,258,754,000 4,188,376,000 4,188,376,000 4,237,439,000 4,197,852,000 4,156,793,000 4,423,060,000 4,402,885,000 4,021,812,000 1,859,615,000 1,784,817,000 1,875,677,000 1,935,676,000 1,889,803,000 1,939,154,000 1,983,900,000 1,934,834,000 1,938,834,000 1,925,486,000 1,836,686,000 1,830,848,000 1,520,118,000 1,493,271,000 1,397,807,000 1,444,872,000 1,409,124,000 1,372,921,000 905,182,000 794,726,000 753,658,000 569,632,750 788,565,000 799,838,000 
      gross profit
    296,500,000 280,990,000 330,598,000 326,950,000 290,761,000 268,404,000 294,153,000 285,044,000 261,174,000 243,970,000 252,305,000 250,078,000 228,094,000 214,988,000 217,268,000 220,550,000 209,952,000 200,204,000 217,258,000 201,534,000 195,259,000 184,370,000 189,868,000 185,079,000 168,813,000 165,800,000 238,226,000 209,244,000 209,244,000 195,362,000 195,362,000 170,613,000 170,613,000 185,179,000 185,179,000 141,272,000 141,272,000 136,152,000 175,176,000 168,444,000 169,973,000 169,973,000 171,343,000 183,444,000 140,858,000 126,518,000 103,312,000 164,223,000 108,540,000 87,407,000 78,198,000 131,814,000 99,843,000 78,118,000 111,238,000 76,117,000 90,346,000 121,239,000 99,735,000 105,335,000 115,065,000 107,895,000 82,977,000 87,117,000 89,634,000 81,207,000 416,021,000 369,395,000 326,592,000 211,095,750 312,091,000 283,871,000 
      yoy
    1.97% 4.69% 12.39% 14.70% 11.33% 10.02% 16.59% 13.98% 14.50% 13.48% 16.13% 13.39% 8.64% 7.38% 0.00% 9.44% 7.52% 8.59% 14.43% 8.89% 15.67% 11.20% -20.30% -11.55% -19.32% -15.13% 21.94% 22.64% 22.64% 5.50% 5.50% 20.77% 20.77% 36.01% 5.71% -16.13% -16.89% -19.90% 2.24% -8.18% 20.67% 34.35% 65.85% 11.70% 29.78% 44.75% 32.12% 24.59% 8.71% 11.89% -29.70% 73.17% 10.51% -35.57% 11.53% -27.74% -21.48% 12.37% 20.20% 20.91% 28.37% 32.86% -80.05% -76.42% -72.55% -61.53% 33.30% 30.13%     
      qoq
    5.52% -15.01% 1.12% 12.45% 8.33% -8.75% 3.20% 9.14% 7.05% -3.30% 0.89% 9.64% 6.10% -1.05% -1.49% 5.05% 4.87% -7.85% 7.80% 3.21% 5.91% -2.90% 2.59% 9.64% 1.82% -30.40% 13.85% 0.00% 7.11% 0.00% 14.51% 0.00% -7.87% 0.00% 31.08% 0.00% 3.76% -22.28% 4.00% -0.90% 0.00% -0.80% -6.60% 30.23% 11.33% 22.46% -37.09% 51.30% 24.18% 11.78% -40.68% 32.02% 27.81% -29.77% 46.14% -15.75% -25.48% 21.56% -5.32% -8.46% 6.65% 30.03% -4.75% -2.81% 10.38% -80.48% 12.62% 13.11% 54.71% -32.36% 9.94%  
      gross margin %
    7.80% 7.33% 7.92% 7.82% 7.71% 6.69% 7.16% 6.87% 6.62% 6.26% 6.57% 6.83% 6.54% 6.36% 6.34% 6.80% 6.53% 6.13% 6.48% 5.91% 5.98% 5.56% 5.32% 5.80% 5.20% 5.12% 4.66% 4.20% 4.20% 3.88% 3.88% 3.39% 3.39% 3.60% 3.60% 2.95% 2.95% 2.77% 3.84% 3.80% 3.90% 3.90% 3.89% 4.19% 3.28% 2.78% 2.29% 3.92% 5.51% 4.67% 4.00% 6.38% 5.02% 3.87% 5.31% 3.79% 4.45% 5.92% 5.15% 5.44% 7.04% 6.74% 5.60% 5.69% 5.98% 5.58% 31.49% 31.73% 30.23% 27.04% 28.35% 26.19% 
      equity in earnings of joint ventures
    9,122,000 9,827,000 5,306,000 5,290,000 6,864,000 9,553,000 3,959,000 7,647,000 19,459,000 -28,941,000 6,866,000 -303,503,000 7,456,000 9,829,000 26,282,000 7,489,000 11,919,000 7,950,000 11,416,000 8,270,000 7,157,000 8,201,000 16,775,000 8,573,000 13,505,000 9,928,000 13,960,000 28,563,000 28,563,000 25,963,000 25,963,000 12,504,000 12,504,000 12,863,000 12,863,000 13,038,000 13,038,000 29,720,000 66,458,000 21,738,000 21,471,000 21,471,000 18,513,000 39,016,000 25,263,000 27,776,000 24,628,000 23,924,000 5,896,000 7,436,000 36,083,000 4,094,000 7,846,000 5,915,000 12,281,000 16,898,000 8,962,000 12,248,000 11,330,000 8,097,000 5,941,000 3,451,000 4,378,000 6,153,000 4,903,000 5,736,000 5,313,000 4,008,000 2,842,000 1,907,000 3,992,000 2,219,000 
      general and administrative expenses
    -44,301,000 -40,839,000 -39,173,000 -38,163,000 -40,054,000 -40,459,000 -43,486,000 -36,209,000 -44,686,000 -35,724,000 -40,933,000 -42,883,000 -34,147,000 -35,612,000 -40,944,000 -32,766,000 -37,098,000 -36,501,000 -44,365,000 -36,340,000 -36,007,000 -38,360,000 -49,402,000 -54,482,000 -41,037,000 -43,614,000 -37,256,000 -37,534,000 -37,534,000                           19,857,000 22,611,000 23,560,000 23,608,000 23,262,000 28,327,000 27,898,000 21,865,000 20,071,000 23,930,000 17,246,000 357,152,000 314,444,000 284,902,000 184,594,000 270,401,000 248,146,000 
      restructuring and acquisition costs
    -13,565,000 -27,933,000                                                                       
      income from operations
    247,756,000 222,045,000 237,376,000 294,077,000 257,571,000 237,498,000 236,378,000 227,457,000 200,482,000 163,125,000 80,381,000 -105,423,000 197,430,000 151,746,000 184,032,000 183,009,000 111,481,000 168,282,000 170,224,000 160,493,000 157,663,000 141,173,000 65,334,000 118,870,000 110,068,000 87,189,000 -419,723,000 192,869,000 192,869,000 168,024,000 168,024,000 83,915,000 83,915,000 160,734,000 160,734,000   131,202,000 207,690,000 140,913,000 143,393,000 143,393,000 110,315,000 140,758,000 96,444,000 41,381,000 6,544,000 15,346,000 91,532,000 68,394,000 90,436,000 111,898,000 80,436,000 61,931,000 102,837,000 73,158,000 76,697,000 109,927,000 87,457,000 90,170,000 92,679,000 83,448,000 65,490,000 73,199,000 70,607,000 69,697,000 64,182,000 58,959,000 44,532,000 28,408,750 45,682,000 37,944,000 
      yoy
    -3.81% -6.51% 0.42% 29.29% 28.48% 45.59% 194.07% -315.76% 1.55% 7.50% -56.32% -157.61% 77.10% -9.83% 8.11% 14.03% -29.29% 19.20% 160.54% 35.02% 43.24% 61.92% -115.57% -38.37% -42.93% -48.11% -349.80% 129.84% 129.84% 4.54% 4.54%   22.51% -22.61%   -8.50% 88.27% 0.11% 48.68% 246.52% 1585.74% 817.23% 5.37% -39.50% -92.76% -86.29% 13.79% 10.44% -12.06% 52.95% 4.88% -43.66% 17.59% -18.87% -17.24% 31.73% 33.54% 23.18% 31.26% 19.73% 2.04% 24.15% 58.55% 145.34% 40.50% 55.38%     
      qoq
    11.58% -6.46% -19.28% 14.17% 8.45% 0.47% 3.92% 13.46% 22.90% 102.94% -176.25% -153.40% 30.11% -17.54% 0.56% 64.16% -33.75% -1.14% 6.06% 1.79% 11.68% 116.08% -45.04% 8.00% 26.24% -120.77% -317.62% 0.00% 14.79% 0.00% 100.23% 0.00% -47.79% 0.00%    -36.83% 47.39% -1.73% 0.00% 29.99% -21.63% 45.95% 133.06% 532.35% -57.36% -83.23% 33.83% -24.37% -19.18% 39.11% 29.88% -39.78% 40.57% -4.61% -30.23% 25.69% -3.01% -2.71% 11.06% 27.42% -10.53% 3.67% 1.31% 8.59% 8.86% 32.40% 56.75% -37.81% 20.39%  
      operating margin %
    6.52% 5.80% 5.69% 7.04% 6.83% 5.92% 5.75% 5.48% 5.08% 4.18% 2.09% -2.88% 5.66% 4.49% 5.37% 5.65% 3.47% 5.15% 5.08% 4.71% 4.83% 4.26% 1.83% 3.73% 3.39% 2.69% -8.20% 3.87% 3.87% 3.33% 3.33% 1.67% 1.67% 3.12% 3.12% 0% 0% 2.67% 4.55% 3.18% 3.29% 3.29% 2.50% 3.21% 2.24% 0.91% 0.15% 0.37% 4.65% 3.65% 4.63% 5.41% 4.04% 3.07% 4.91% 3.64% 3.78% 5.37% 4.52% 4.66% 5.67% 5.21% 4.42% 4.78% 4.71% 4.79% 4.86% 5.06% 4.12% 3.64% 4.15% 3.50% 
      other income
    10,637,000 7,819,000 11,458,000 823,000 -8,748,000 6,924,000 11,416,000 963,000 2,622,000 2,569,000 2,075,000 1,797,000 12,305,000 7,870,000 3,635,000 4,314,000 3,329,000 2,874,000 5,791,000 4,482,000 3,477,000 3,853,000 1,499,000 3,119,000 2,430,000 4,008,000 4,040,000 4,886,000 4,886,000 4,266,000 4,266,000 3,597,000 3,597,000 2,752,000 2,752,000 12,507,000 12,507,000 2,283,000 2,136,000 1,241,000 860,000 860,000 1,498,000 746,000 3,042,000 10,128,000  2,579,000 1,034,000  17,000 1,215,000 156,000 301,000 1,043,000 4,471,000 1,919,000  1,456,000 2,288,000  1,829,000 1,704,000 3,248,000   756,000      
      interest income
    13,712,000 13,741,000 17,737,000 14,063,000 14,530,000 16,564,000 15,219,000 15,817,000 15,422,000 12,102,000 15,759,000 8,802,000                                                        2,061,000     
      interest expense
    -50,570,000 -45,266,000 -58,867,000 -40,198,000 -42,205,000 -43,034,000 -45,070,000 -51,370,000 -47,723,000 -41,257,000 -41,402,000 -38,868,000 -42,372,000 -36,700,000 -33,302,000 -27,416,000 -24,173,000 -25,383,000 -25,863,000 -149,038,000 -32,800,000 -30,651,000 -47,501,000 -34,925,000 -37,111,000 -40,377,000 -56,376,000 -55,764,000 -55,764,000                                            
      income from continuing operations before taxes
    221,535,000 198,339,000 207,704,000 268,765,000 221,148,000 217,952,000 217,943,000 192,867,000 170,803,000 136,539,000 56,813,000 -133,692,000 167,363,000 122,916,000 154,365,000 159,907,000 90,637,000 145,773,000 150,152,000 15,937,000 128,340,000 114,375,000 19,332,000 87,064,000 75,387,000 50,820,000                                               
      income tax expense for continuing operations
    26,841,000 39,083,000 58,400,000 65,148,000 51,238,000 29,232,000 34,822,000 46,035,000 45,385,000 26,658,000 9,182,000 -20,000,000 41,105,000 25,765,000 32,967,000 44,517,000 36,011,000 22,556,000 46,200,000 -17,938,000 35,148,000 25,601,000 15,427,000 -7,184,000 21,604,000 15,906,000                                               
      net income from continuing operations
    194,694,000 159,256,000 149,304,000 203,617,000 169,910,000 188,720,000 183,121,000 146,832,000 125,418,000 109,881,000 47,631,000 -113,692,000 126,258,000 97,151,000 121,398,000 115,390,000 54,626,000 123,217,000 103,952,000 33,875,000 93,192,000 88,774,000 3,905,000 94,248,000 53,783,000 34,914,000                                               
      net loss from discontinued operations
    -4,246,000 -65,904,000   -10,370,000 -9,516,000   -109,388,000 -1,287,000 -7,437,000 -7,607,000 -41,775,000 -388,000 -8,395,000 -3,481,000 -6,113,000 -61,940,000 2,355,000 -15,502,000 -47,914,000                                                    
      net income
    190,448,000 93,352,000 137,706,000 159,737,000 159,540,000 179,204,000 183,122,000 152,509,000 16,030,000 108,594,000 40,194,000 -121,299,000 84,483,000 96,763,000 113,003,000 111,909,000 48,513,000 61,277,000 106,307,000 18,373,000 45,278,000 33,022,000 -223,991,000 94,122,000 -76,966,000 53,094,000 -447,983,000 105,388,000 105,388,000 93,519,000 93,519,000 65,086,000 65,086,000 75,142,000 75,142,000   124,413,000 136,074,000 115,840,000 65,778,000 65,778,000 84,394,000 66,594,000   20,604,000  69,092,000 42,496,000 56,541,000 71,215,000 54,776,000 38,978,000 69,855,000 49,656,000 48,424,000 73,931,000 59,660,000 62,083,000 68,635,000 61,654,000 49,867,000 51,121,000 43,398,000 40,905,000 38,454,000 35,829,000 29,493,000 17,726,250 24,186,000 21,198,000 
      yoy
    19.37% -47.91% -24.80% 4.74% 895.26% 65.02% 355.60% -225.73% -81.03% 12.23% -64.43% -208.39% 74.15% 57.91% 6.30% 509.09% 7.14% 85.56% -147.46% -80.48% -158.83% -37.80% -50.00% -10.69% -173.03% -43.23% -579.03% 61.92% 61.92% 24.46% 24.46%   -39.60% -44.78%   89.14% 61.24% 73.95%   309.60%    -63.56%  26.14% 9.03% -19.06% 43.42% 13.12% -47.28% 17.09% -20.02% -29.45% 19.91% 19.64% 21.44% 58.15% 50.72% 29.68% 42.68% 47.15% 130.76% 58.99% 69.02%     
      qoq
    104.01% -32.21% -13.79% 0.12% -10.97% -2.14% 20.07% 851.40% -85.24% 170.17% -133.14% -243.58% -12.69% -14.37% 0.98% 130.68% -20.83% -42.36% 478.60% -59.42% 37.11% -114.74% -337.98% -222.29% -244.96% -111.85% -525.08% 0.00% 12.69% 0.00% 43.69% 0.00% -13.38% 0.00%    -8.57% 17.47% 76.11% 0.00% -22.06% 26.73%      62.58% -24.84% -20.61% 30.01% 40.53% -44.20% 40.68% 2.54% -34.50% 23.92% -3.90% -9.55% 11.32% 23.64% -2.45% 17.80% 6.09% 6.37% 7.33% 21.48% 66.38% -26.71% 14.10%  
      net income margin %
    5.01% 2.44% 3.30% 3.82% 4.23% 4.46% 4.45% 3.67% 0.41% 2.78% 1.05% -3.31% 2.42% 2.86% 3.30% 3.45% 1.51% 1.88% 3.17% 0.54% 1.39% 1.00% -6.28% 2.95% -2.37% 1.64% -8.76% 2.12% 2.12% 1.86% 1.86% 1.29% 1.29% 1.46% 1.46% 0% 0% 2.53% 2.98% 2.62% 1.51% 1.51% 1.91% 1.52% 0% 0% 0.46% 0% 3.51% 2.27% 2.89% 3.44% 2.75% 1.93% 3.33% 2.47% 2.39% 3.61% 3.08% 3.21% 4.20% 3.85% 3.37% 3.34% 2.90% 2.81% 2.91% 3.08% 2.73% 2.27% 2.20% 1.96% 
      net income attributable to noncontrolling interests from continuing operations
    -10,588,000 -18,832,000 -17,334,000 -28,771,000 -15,812,000 -11,370,000 -14,737,000 -17,355,000 -14,113,000 -13,117,000 -13,700,000 -11,829,000 -8,089,000 -9,644,000 -5,986,000 -8,487,000 -5,592,000 -5,456,000 -8,949,000 -5,901,000 -4,845,000 -5,414,000 -3,970,000 -3,138,000 -5,243,000 -4,047,000                                               
      net income attributable to noncontrolling interests from discontinued operations
        -334,000 -792,000 4,163,000 -881,000  -1,039,000         -1,191,000 -941,000 -1,074,000 -1,480,000 -2,226,000 -1,645,000 -3,917,000 -8,443,000                                               
      net income attributable to noncontrolling interests
    -10,588,000 -18,832,000 -17,334,000 -28,771,000 -16,146,000 -12,162,000 -10,574,000 -18,236,000 -15,023,000 -14,156,000 -14,721,000 -13,402,000 -7,868,000  -7,385,000 -10,021,000 -6,956,000  -10,140,000 -6,842,000 -5,919,000 -6,894,000 -6,196,000 -4,783,000 -9,160,000 -12,490,000                                               
      net income attributable to aecom from continuing operations
    184,106,000 140,424,000 131,970,000 174,846,000 154,098,000 177,350,000 168,384,000 129,477,000 111,305,000 96,764,000 33,931,000 -125,521,000 118,169,000 87,507,000 115,412,000 106,903,000 49,034,000 117,761,000 95,003,000 27,974,000 88,347,000 83,360,000 -65,000 91,110,000 48,540,000 30,867,000                                               
      net loss attributable to aecom from discontinued operations
    -4,246,000 -65,904,000   -10,704,000 -10,308,000   -110,298,000  -8,458,000 -9,180,000 -41,554,000  -9,794,000 -5,015,000 -7,477,000 -56,213,000 1,164,000 -16,443,000 -48,988,000                                                    
      net income attributable to aecom
    179,860,000 74,520,000 120,372,000 130,966,000 143,394,000 167,042,000 172,548,000 134,273,000 1,007,000 94,438,000 25,473,000 -134,701,000 76,615,000 87,945,000 105,618,000 101,888,000 41,557,000 61,548,000 96,167,000 11,531,000 39,359,000 26,128,000 -230,187,000 89,339,000 -86,126,000 40,604,000 -474,152,000 83,738,000 83,738,000 77,845,000 77,845,000 51,519,000 51,519,000 60,910,000 60,910,000 -119,733,000 -119,733,000 111,314,000 101,327,000 102,396,000 47,179,000 47,179,000 67,444,000 41,828,000   266,000 -103,503,000 69,240,000 40,192,000 56,396,000 70,755,000 53,811,000 38,109,000 69,413,000 48,994,000 47,931,000 73,834,000 57,715,000 56,868,000 64,842,000 58,489,000 45,782,000          
      net income attributable to aecom per share:
                                                                            
      basic continuing operations per share
    1.43 1.07 1.32 1.16 1.34 1.25 0.95 0.82 0.71 0.24 -0.9 0.85 0.63 0.82 0.76 0.35 0.83 0.65 0.19 0.6 0.55  0.57 0.31 0.2                                               
      basic discontinued operations per share
    -0.03 -0.5 -0.09 -0.33 -0.08 -0.08 0.03 0.04 -0.81 -0.02 -0.06 -0.07 -0.3  -0.06 -0.04 -0.06 -0.4 0.01 -0.11 -0.33 -0.38 -1.45 -0.01 -0.85 0.06                                               
      basic earnings per share
    1.4 0.57 0.91 0.99 1.08 1.26 1.28 0.99 0.01 0.69 0.18 -0.97 0.55 0.63 0.76 0.72 0.29 0.43 0.66 0.08 0.27 0.17 -1.45 0.56 -0.54 0.26                                               
      diluted continuing operations per share
    1.42 1.06 0.99 1.31 1.16 1.33 1.24 0.95 0.81 0.71 0.24 -0.9 0.84 0.62 0.82 0.75 0.34 0.81 0.65 0.19 0.59 0.54  0.56 0.3 0.19                                               
      diluted discontinued operations per share
    -0.03 -0.5 -0.09 -0.33 -0.08 -0.08 0.03 0.03 -0.8 -0.02 -0.06 -0.07 -0.29 0.01 -0.07 -0.03 -0.05 -0.38  -0.11 -0.33 -0.37 -1.43 -0.01 -0.84 0.06                                               
      diluted earnings per share
    1.39 0.56 0.9 0.98 1.08 1.25 1.27 0.98 0.01 0.69 0.18 -0.97 0.55 0.63 0.75 0.72 0.29 0.43 0.65 0.08 0.26 0.17 -1.43 0.55 -0.54 0.25                                               
      weighted-average shares outstanding:
                                                                            
      basic
    128,728 130,888 132,373 132,301 132,432 132,500 135,544 136,025 136,006 135,897 138,614 138,741 138,927 138,687 140,768 140,608 141,060 141,778 147,279 146,109 147,770 151,424 159,005 160,119 158,550 157,332 157,044 157,429 157,429 156,621 156,621 156,416 156,416 160,395 160,395 159,495 159,495 157,909 155,763 155,366 154,255 154,255 154,852 154,295 153,619 151,697 151,053 141,892 97,483 97,012 96,302 99,257 100,430 104,759 110,221 113,352 113,965 117,932 117,283 118,001 114,539 113,801 113,153 109,872 106,465 104,529 102,020 100,571 99,644  80,915 56,331 
      diluted
    129,235 131,982 133,311 133,078 133,139 133,625 136,453 136,790 136,712 137,101 140,109 138,741 140,335 140,642 142,696 142,178 142,626 144,637 149,676 148,859 149,519 153,744 161,292 161,835 160,718 160,657 157,044 159,787 159,787 158,416 158,416 159,603 159,603 163,213 163,213 159,495 159,495 161,847 158,820 158,650 157,993 157,993 156,175 155,448 153,619 151,697 152,818 141,892 98,956 98,337 97,590 100,761 101,818 105,538 110,819 114,288 114,591 118,907 118,278 119,115 115,620 115,044 114,498 111,515 108,148 106,620 104,563 103,454 103,025  92,037 77,964 
      restructuring costs
          -18,248,000 -29,025,000 -35,465,000 -16,180,000 -137,857,000 -9,115,000 -3,973,000 -37,459,000 -18,574,000 -12,264,000 -73,292,000 -3,371,000 -14,085,000 -12,971,000 -8,746,000 -13,038,000 -91,907,000 -20,300,000 -31,213,000 -44,925,000                                               
      net income from discontinued operations
      -15,941,500 -43,880,000   -26,249,500 5,677,000              -55,752,000 -28,173,750 -126,000 -130,749,000 18,180,000                                               
      net income attributable to aecom from discontinued operations
      -16,223,000 -43,880,000   -26,957,000 4,796,000  -2,326,000    438,000        -57,232,000 -31,675,000 -1,771,000 -134,666,000 9,737,000                                               
      net loss attributable to noncontrolling interests from discontinued operations
            -910,000  -131,500 -1,573,000 221,000 826,000 707,250 -1,534,000 -1,364,000 5,727,000                                                       
      net loss attributable to noncontrolling interests
                 -8,818,000    271,000                                                       
      ​
                                                                            
      loss on disposal activities
                                -7,404,000                                            
      impairment of assets held for sale, including goodwill
                                                                            
      income before income tax benefit
                              71,984,750 141,991,000  114,462,000  31,486,000 31,486,000          49,297,000                              
      income tax benefit
                              5,986,500 36,603,000  20,943,000    33,131,000       24,838,000                                
      noncontrolling interests in income of consolidated subsidiaries, net of tax
                              -26,169,000 -21,650,000 -21,650,000                    148,000                        
      net income attributable to aecom per share:
                                                                            
      basic
                              -3.02 0.53 0.53 0.5 0.5 0.33 0.33 0.38 0.38 -0.75 -0.75 0.7 0.65 0.66 0.31 0.31 0.44 0.27    -0.73 0.71 0.41 0.59 0.71 0.54  0.63                  
      diluted
                              -3 0.52 0.52 0.49 0.49 0.32 0.32 0.37 0.37 -0.75 -0.75 0.69 0.64 0.65 0.3 0.3 0.43 0.27    -0.73 0.7 0.41 0.58 0.7 0.53  0.63                  
      income before income tax expense
                                141,991,000  114,462,000   108,273,000 108,273,000   77,320,000 148,279,000 80,353,000 90,616,000 90,616,000  78,781,000     82,769,000 57,701,000 80,026,000 101,394,000 68,737,000 51,681,000 91,178,000 66,425,000 68,002,000          59,878,000 55,409,000 44,686,000 26,562,000 35,546,000 32,068,000 
      income tax expense
                                36,603,000  20,943,000    33,131,000    12,205,000   24,838,000  12,187,000     13,677,000 15,205,000 23,485,000 30,179,000 13,961,000 12,703,000 21,323,000 16,769,000 19,578,000 23,959,000 19,239,000 20,503,000 22,665,000 21,048,000 16,465,000 20,987,000 18,431,000 17,360,000 21,424,000 19,580,000 15,193,000 8,835,750 11,360,000 10,870,000 
      acquisition and integration expense
                                                                            
      gain on disposal activities
                                           572,000                                 
      acquisition and integration expenses
                                                                            
      loss before income tax expense
                                                                            
      net loss attributable to aecom
                                                -20,367,000                            
      net loss attributable to aecom per share:
                                                                            
      basic
                                                -0.13                            
      diluted
                                                -0.13                            
      net (loss) income
                                                                            
      net (loss) income attributable to aecom
                                                 -17,192,000                           
      net (loss) income attributable to aecom per share:
                                                                            
      basic
                                                 -0.11                           
      diluted
                                                 -0.11                           
      net income attributable to aecom per share:
                                                                            
      basic and diluted
                                                         0.36  0.43 0.42                
      net income allocation:
                                                                            
      preferred stock dividend
                                                               2,000 34,000 35,000 35,000 63,000 35,000 36,000 36,000 39,000 56,000 46,000 68,000 87,000 
      net income available for common stockholders
                                                          69,413,000 48,994,000 47,931,000 73,834,000 57,715,000 56,866,000 64,808,000 58,454,000 45,747,000 51,058,000 43,363,000 40,869,000 38,418,000 35,790,000 29,437,000 17,680,250 24,118,000 21,111,000 
      income from continuing operations before income tax expense
                                                             97,890,000 78,899,000 82,586,000 91,300,000 82,892,000 66,219,000 70,890,000 61,437,000 57,865,000       
      income from continuing operations
                                                             73,931,000 59,660,000 62,083,000 68,635,000 61,844,000 49,754,000 49,903,000 43,006,000 40,505,000       
      discontinued operations, net of tax
                                                                  113,000 1,218,000 392,000 400,000       
      net income attributable to aecom per share:
                                                                            
      basic
                              -3.02 0.53 0.53 0.5 0.5 0.33 0.33 0.38 0.38 -0.75 -0.75 0.7 0.65 0.66 0.31 0.31 0.44 0.27    -0.73 0.71 0.41 0.59 0.71 0.54  0.63                  
      continuing operations
                                                             0.63 0.49 0.48 0.57 0.51 0.4 0.45 0.4 0.39       
      discontinued operations
                                                                   0.01 0.01        
      diluted
                                                                            
      discontinued operations
                                                                   0.01 0.01        
      minority interest in share of earnings
                                                                   3,040,000 5,732,000 3,446,000 4,862,000 4,798,000 1,279,000 2,264,500 3,824,000 3,648,000 
      net income per share
                                                                            
      basic
                                                                      0.38 0.36 0.3    
      other expense
                                                                    1,419,000 4,788,000  813,000     
      gain on sale of equity investment
                                                                            
      net income per share
                                                                            
      basic
                                                                      0.38 0.36 0.3    
      diluted
                                                                      0.37 0.35 0.29    
      interest income (expense)
                                                                        1,433,000    
      gain on the sale of equity investment
                                                                         2,821,500   
      interest expense — net
                                                                         2,403,750 6,312,000 2,228,000 
      earnings per share:
                                                                            
      basic
                                                                         0.273 0.3 0.37 
      diluted
                                                                         0.213 0.26 0.27 
      weighted-average common shares outstanding:
                                                                            
      basic
    128,728 130,888 132,373 132,301 132,432 132,500 135,544 136,025 136,006 135,897 138,614 138,741 138,927 138,687 140,768 140,608 141,060 141,778 147,279 146,109 147,770 151,424 159,005 160,119 158,550 157,332 157,044 157,429 157,429 156,621 156,621 156,416 156,416 160,395 160,395 159,495 159,495 157,909 155,763 155,366 154,255 154,255 154,852 154,295 153,619 151,697 151,053 141,892 97,483 97,012 96,302 99,257 100,430 104,759 110,221 113,352 113,965 117,932 117,283 118,001 114,539 113,801 113,153 109,872 106,465 104,529 102,020 100,571 99,644  80,915 56,331 
      diluted
    129,235 131,982 133,311 133,078 133,139 133,625 136,453 136,790 136,712 137,101 140,109 138,741 140,335 140,642 142,696 142,178 142,626 144,637 149,676 148,859 149,519 153,744 161,292 161,835 160,718 160,657 157,044 159,787 159,787 158,416 158,416 159,603 159,603 163,213 163,213 159,495 159,495 161,847 158,820 158,650 157,993 157,993 156,175 155,448 153,619 151,697 152,818 141,892 98,956 98,337 97,590 100,761 101,818 105,538 110,819 114,288 114,591 118,907 118,278 119,115 115,620 115,044 114,498 111,515 108,148 106,620 104,563 103,454 103,025  92,037 77,964 
                                                                            
    Balance Sheets:
    Quarterly
    Annual
      Unit: USD2026-04-03 2026-01-02 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 2019-06-28 2019-03-31 2019-03-29 2018-12-31 2018-12-28 2018-06-30 2018-06-29 2018-03-31 2018-03-30 2017-12-31 2017-12-29 2017-06-30 2017-03-31 2016-12-31 2016-12-30 2016-07-01 2016-06-30 2016-04-01 2016-03-31 2016-01-01 2015-12-31 2015-06-30 2015-04-03 2015-03-31 2015-01-02 2014-12-31 2014-06-30 2014-03-31 2013-12-31 2013-06-30 2013-03-31 2012-12-31 2012-06-30 2012-03-31 2011-12-31 2011-06-30 2011-03-31 2010-12-31 2010-06-30 2010-03-31 2009-12-31 2009-06-30 2009-03-31 2008-12-31 2008-06-30 2008-03-31 2007-12-31 2007-06-30 2007-03-31 2006-09-30 
                                                                                    
        assets
                                                                                    
        current assets:
                                                                                    
        cash and cash equivalents
      802,442,000 1,022,141,000 1,378,582,000 1,539,369,000 1,372,790,000 1,337,584,000 1,316,945,000 1,349,172,000 910,934,000 987,377,000 1,030,447,000 1,038,278,000 907,510,000 980,203,000 972,661,000 865,813,000 829,719,000 967,789,000 1,120,790,000 935,434,000 815,569,000 940,857,000 1,599,688,000 1,229,479,000 1,033,266,000 619,683,000 834,835,000 592,784,000 592,784,000 592,731,000 592,731,000 640,572,000 640,572,000 628,321,000 628,321,000 662,168,000 662,168,000 616,127,000 616,127,000 644,890,000 619,909,000 560,513,000 560,513,000 508,766,000 508,766,000 528,490,000 528,490,000 525,403,000 525,403,000 467,704,000 461,155,000 461,155,000 583,884,000 583,884,000 419,248,000 402,959,000 510,696,000 351,651,000 491,146,000 459,276,000 286,263,000 378,494,000 420,837,000 354,724,000 347,701,000 349,120,000 241,843,000 196,284,000 219,464,000 242,367,000 215,238,000 199,175,000 141,490,000 194,127,000 298,142,000 303,601,000 84,472,000  
        cash in consolidated joint ventures
      231,815,000 224,546,000 207,157,000 254,708,000 227,275,000 243,072,000 263,932,000 295,640,000 274,872,000 204,883,000 229,759,000 219,453,000 166,005,000 180,147,000 199,548,000 144,909,000 135,351,000 114,604,000 108,406,000 113,596,000 119,337,000 103,891,000 108,644,000 101,789,000 101,795,000 105,753,000 245,519,000 200,783,000 200,783,000 234,147,000 234,147,000 197,730,000 197,730,000 173,098,000 173,098,000 205,057,000 205,057,000 197,039,000 197,039,000 167,569,000 106,063,000 137,204,000 137,204,000 119,231,000 119,231,000 141,288,000 141,288,000 132,641,000 132,641,000 138,196,000 151,442,000 151,442,000 150,764,000 150,764,000 90,899,000 99,584,000 171,047,000 155,940,000 136,586,000 132,020,000 112,131,000 87,168,000 86,649,000 26,743,000 55,683,000 72,118,000 52,039,000 10,265,000 33,485,000 32,639,000 25,963,000 43,917,000 31,618,000 23,548,000 28,935,000 39,472,000 31,742,000  
        total cash and cash equivalents
      1,034,257,000 1,246,687,000 1,585,739,000 1,794,077,000 1,600,065,000 1,580,656,000 1,580,877,000 1,644,812,000 1,185,806,000 1,192,260,000 1,260,206,000 1,257,731,000 1,073,515,000 1,160,350,000 1,172,209,000 1,010,722,000 965,070,000 1,082,393,000 1,229,196,000 1,049,030,000 934,906,000 1,044,748,000 1,708,332,000 1,331,268,000 1,135,061,000 725,436,000 1,080,354,000 793,567,000 793,567,000 826,878,000 826,878,000 838,302,000 838,302,000 801,419,000 801,419,000 867,225,000 867,225,000 813,166,000 813,166,000 812,459,000 725,972,000 697,717,000 697,717,000 627,997,000 627,997,000 669,778,000 669,778,000 658,044,000 658,044,000 605,900,000 612,597,000 612,597,000 734,648,000 734,648,000 510,147,000 502,543,000 681,743,000 507,591,000 627,732,000 591,296,000 398,394,000 465,662,000 507,486,000 381,467,000 403,384,000 421,238,000 293,882,000 206,549,000 252,949,000 275,006,000 241,201,000 243,092,000 173,108,000 217,675,000 327,077,000 343,073,000 116,264,000  
        accounts receivable—net
      2,464,696,000 2,348,427,000 2,497,147,000 2,597,746,000 2,517,937,000 2,648,977,000 2,793,307,000 2,660,421,000 2,646,722,000 2,524,502,000 2,544,453,000 2,518,519,000 2,427,913,000 2,433,302,000 2,317,812,000 2,439,538,000 2,450,085,000 2,581,708,000 2,619,491,000 2,669,113,000 2,793,212,000 2,930,891,000 2,865,888,000 2,811,876,000 2,888,939,000 2,839,696,000 3,517,072,000 3,373,361,000 3,373,361,000 3,285,939,000 3,285,939,000 3,282,128,000 3,282,128,000 5,447,985,000 5,447,985,000 5,208,918,000 5,208,918,000 5,313,672,000 5,313,672,000 4,759,306,000 4,708,941,000 4,538,396,000 4,538,396,000 4,620,393,000 4,620,393,000 4,801,196,000 4,801,196,000 4,807,853,000 4,807,853,000 4,985,309,000 4,785,335,000 4,785,335,000 4,873,911,000 4,873,911,000 2,431,517,000 2,341,025,000 2,410,041,000 2,341,146,000 2,331,265,000 2,481,834,000 2,483,269,000 2,554,224,000 2,513,914,000 2,474,039,000 2,316,074,000 2,315,592,000 1,902,633,000 1,950,645,000 1,794,257,000 1,673,394,000 1,655,497,000 1,647,164,000    1,051,414,000 1,040,079,000  
        contract assets
      2,164,244,000 2,035,472,000 1,785,179,000 1,922,253,000 1,883,302,000 1,800,685,000 1,806,458,000 1,884,755,000 1,805,622,000 1,744,521,000 1,525,051,000 1,608,335,000 1,604,593,000 1,488,926,000 1,405,299,000 1,435,145,000 1,391,380,000 1,349,285,000 1,369,031,000 1,498,550,000 1,517,663,000 1,488,615,000 1,536,389,000 1,679,983,000 1,766,376,000 1,671,583,000 2,260,580,000 2,454,757,000 2,454,757,000 2,426,892,000 2,426,892,000 2,263,494,000 2,263,494,000                                              
        prepaid expenses and other current assets
      707,594,000 724,746,000 716,070,000 854,896,000 792,830,000 758,412,000 758,693,000 732,455,000 725,847,000 723,139,000 730,145,000 719,866,000 755,049,000 784,814,000 759,402,000 768,225,000 753,727,000 741,739,000 739,044,000 867,154,000 870,962,000 738,945,000 667,393,000 668,739,000 726,643,000 532,364,000 627,550,000 607,511,000 607,511,000 592,189,000 592,189,000 681,449,000 681,449,000 651,816,000 651,816,000 648,602,000 648,602,000 676,951,000 676,951,000 718,620,000 688,474,000 707,738,000 707,738,000 852,582,000 852,582,000 771,423,000 771,423,000 386,142,000 386,142,000 375,248,000 383,870,000 383,870,000 371,358,000 371,358,000 150,842,000 154,262,000 126,907,000 169,231,000 157,675,000 156,613,000 145,157,000 109,196,000 104,819,000 129,850,000 128,093,000 126,608,000 145,241,000 142,056,000 146,127,000 80,472,000 73,629,000 82,052,000 80,666,000 56,348,000 70,971,000 80,016,000 56,665,000  
        income taxes receivable
      120,604,000 136,571,000 146,092,000 98,061,000 136,660,000 143,500,000 159,500,000 60,251,000 28,698,000 11,714,000 14,435,000 58,699,000 67,499,000 87,487,000 89,088,000 47,615,000 59,252,000 67,294,000 77,355,000 37,629,000 38,824,000 30,969,000 35,637,000 54,677,000 61,420,000 55,958,000 49,089,000 42,629,000 42,629,000 53,742,000 53,742,000 125,661,000 125,661,000 79,319,000 79,319,000 82,460,000 82,460,000 38,251,000 38,251,000 42,906,000 42,921,000 41,250,000 41,250,000 70,923,000 70,923,000 43,539,000 43,539,000 44,535,000 44,535,000 98,990,000 94,218,000 94,218,000 22,571,000 22,571,000 9,355,000 6,122,000 10,207,000  13,116,000 11,916,000 12,975,000 30,491,000 54,565,000 107,029,000 117,105,000 120,826,000    11,207,000         
        total current assets
      6,491,395,000 6,491,903,000 6,730,227,000 7,267,033,000 6,930,794,000 6,999,358,000 7,176,059,000 7,118,664,000 6,497,786,000 6,282,032,000 6,169,511,000 6,271,742,000 6,039,143,000 6,027,467,000 5,822,810,000 5,795,787,000 5,697,176,000 5,930,268,000 6,173,543,000 6,248,493,000 6,258,426,000 6,900,892,000 7,530,366,000 7,290,362,000 7,378,257,000 7,466,933,000 7,534,645,000 7,271,825,000 7,271,825,000 7,240,640,000 7,240,640,000 7,249,734,000 7,249,734,000 7,043,842,000 7,043,842,000 6,923,960,000 6,923,960,000 6,842,040,000 6,842,040,000 6,333,291,000 6,166,308,000 5,985,101,000 5,985,101,000 6,171,895,000 6,171,895,000 6,285,936,000 6,285,936,000 5,896,574,000 5,896,574,000 6,227,370,000 5,985,183,000 5,985,183,000 6,100,785,000 6,100,785,000 3,121,810,000 3,023,901,000 3,248,847,000 3,049,684,000 3,161,809,000 3,258,532,000 3,046,926,000 3,167,476,000 3,187,915,000 3,092,385,000 2,964,656,000 2,984,264,000 2,377,945,000 2,348,566,000 2,231,800,000 2,245,115,000 2,085,847,000 2,089,611,000 1,659,162,000 1,609,214,000 1,569,274,000 1,474,503,000 1,213,008,000  
        property and equipment—net
      387,887,000 387,128,000 416,164,000 403,936,000 359,097,000 362,860,000 354,377,000 356,878,000 372,384,000 389,728,000 382,638,000 417,080,000 429,815,000 438,808,000 428,239,000 454,403,000 391,564,000 400,902,000 398,876,000 410,864,000 408,168,000 412,636,000 381,672,000 388,864,000 383,871,000 403,882,000 559,399,000 603,480,000 603,480,000 596,374,000 596,374,000 601,005,000 601,005,000 607,151,000 607,151,000 583,417,000 583,417,000 631,601,000 631,601,000 603,327,000 619,032,000 634,916,000 634,916,000 624,545,000 624,545,000 596,891,000 596,891,000 601,781,000 601,781,000 751,118,000 792,558,000 792,558,000 862,640,000 862,640,000 278,780,000 277,934,000 275,897,000 270,344,000 312,702,000 322,714,000 326,045,000 331,375,000 333,585,000 303,331,000 280,297,000 282,436,000 226,143,000 235,639,000 234,774,000 215,916,000 220,088,000 218,311,000 184,347,000 136,341,000 124,880,000 114,099,000 109,085,000  
        deferred tax assets—net
      352,747,000 294,894,000 295,249,000 339,855,000 318,307,000 326,035,000 326,685,000 398,871,000 444,957,000 459,568,000 439,604,000 354,945,000 292,844,000 293,987,000 284,154,000 326,687,000 361,319,000 373,301,000 360,260,000 444,647,000 380,686,000 380,997,000 357,318,000 382,834,000 409,566,000 229,211,000 245,331,000 160,289,000 160,289,000 163,707,000 163,707,000 167,886,000 167,886,000 181,564,000 181,564,000 219,907,000 219,907,000 216,742,000 216,742,000 194,035,000 174,671,000 136,442,000 136,442,000       161,923,000 109,163,000 109,163,000 98,297,000 98,297,000 19,949,000 19,949,000 19,949,000 31,716,000 32,021,000 16,873,000 7,131,000 7,903,000 7,131,000    36,189,000 49,316,000 34,676,000 41,089,000 34,161,000 39,153,000 56,639,000 61,563,000 60,568,000    
        investments in unconsolidated joint ventures
      147,066,000 146,485,000 138,056,000 149,195,000 143,579,000 144,947,000 138,067,000 140,629,000 137,422,000 132,460,000 139,236,000 138,191,000 387,103,000 376,951,000 354,983,000 347,240,000 341,452,000 327,500,000 328,906,000 331,994,000 326,958,000 254,616,000 229,312,000 240,525,000 256,932,000 279,286,000 405,225,000 391,520,000 391,520,000 338,431,000 338,431,000 341,009,000 341,009,000 398,134,000 398,134,000 384,897,000 384,897,000 370,294,000 370,294,000 339,269,000 354,571,000 343,874,000 343,874,000 341,967,000 341,967,000 347,085,000 347,085,000 314,425,000 314,425,000 326,601,000 336,221,000 336,221,000 348,671,000 348,671,000 133,766,000 124,359,000 53,469,000 83,843,000 87,321,000 86,323,000 84,237,000 83,489,000 66,888,000 83,655,000 79,972,000 69,674,000 33,194,000 30,441,000 28,566,000 36,953,000 42,766,000 41,444,000 34,089,000 26,280,000 24,145,000    
        goodwill
      3,762,252,000 3,773,803,000 3,700,619,000 3,486,713,000 3,444,057,000 3,428,231,000 3,480,155,000 3,448,160,000 3,446,984,000 3,458,675,000 3,418,930,000 3,444,586,000 3,431,302,000 3,424,704,000 3,380,761,000 3,435,625,000 3,490,544,000 3,497,763,000 3,502,499,000 3,516,781,000 3,512,839,000 3,514,482,000 3,484,221,000 3,466,584,000 3,446,939,000 3,492,101,000 5,275,281,000 5,906,484,000 5,906,484,000 5,908,248,000 5,908,248,000 5,893,534,000 5,893,534,000 5,928,029,000 5,928,029,000 5,942,572,000 5,942,572,000 5,997,000,000 5,997,000,000 5,840,508,000 5,805,248,000 5,784,423,000 5,784,423,000 5,831,409,000 5,831,409,000 5,785,619,000 5,785,619,000 5,753,212,000 5,753,212,000 5,803,966,000 5,665,369,000 5,665,369,000 5,671,767,000 5,671,767,000 1,896,371,000 1,887,447,000 1,884,760,000 1,797,314,000 1,807,943,000 1,816,965,000 2,109,741,000 2,125,304,000 2,097,855,000 2,120,527,000 2,047,963,000 2,007,684,000 1,148,629,000 1,132,771,000 1,133,659,000 1,044,755,000 973,865,000 947,616,000    548,243,000 534,575,000  
        intangible assets—net
      177,837,000 179,980,000 183,284,000 5,183,000 5,554,000 5,926,000 6,932,000 11,515,000 16,111,000 20,745,000 17,769,000 22,354,000 26,813,000 31,290,000 35,552,000 40,442,000 45,486,000 50,174,000 54,867,000 61,666,000 66,791,000 72,003,000 76,917,000 81,995,000 87,591,000 94,274,000 233,018,000 255,213,000 255,213,000 277,208,000 277,208,000 296,711,000 296,711,000 343,185,000 343,185,000 368,215,000 368,215,000 411,759,000 411,759,000 410,294,000 426,790,000 449,785,000 449,785,000 493,249,000 493,249,000 532,700,000 532,700,000 591,631,000 591,631,000 753,202,000 854,493,000 854,493,000 858,860,000 858,860,000 86,717,000 92,121,000 98,353,000 87,394,000 94,112,000 100,659,000 101,933,000 108,796,000 113,514,000 128,386,000 131,043,000 137,863,000 62,514,000 61,796,000 67,025,000 65,395,000 67,343,000 73,145,000 58,420,000 44,497,000 33,876,000    
        other non-current assets
      215,622,000 203,520,000 254,218,000 120,475,000 127,049,000 140,949,000 147,228,000 151,590,000 118,899,000 208,891,000 218,666,000 232,282,000 221,356,000 256,025,000 293,043,000 288,555,000 291,142,000 278,117,000 307,927,000 311,333,000 313,158,000 158,326,000 160,036,000 153,173,000 164,875,000 169,922,000 208,692,000 206,401,000 206,401,000 212,415,000 212,415,000 217,771,000 217,771,000 225,512,000 225,512,000 194,364,000 194,364,000 153,515,000 153,515,000 115,518,000 94,421,000 174,455,000 174,455,000 305,129,000 305,129,000 314,138,000 314,138,000 246,301,000 246,301,000 293,772,000 302,084,000 302,084,000 338,511,000 338,511,000 119,208,000 123,021,000 165,011,000 132,654,000 104,074,000 105,569,000 120,251,000 123,178,000 121,192,000 102,989,000 104,720,000 97,800,000 58,610,000 44,353,000 46,614,000 83,959,000 128,511,000 126,045,000 162,266,000 160,928,000 90,468,000 140,411,000 43,289,000  
        operating lease right-of-use assets
      453,649,000 448,370,000 463,479,000 462,863,000 431,485,000 410,521,000 432,166,000 420,291,000 422,850,000 437,822,000 447,044,000 545,263,000 558,150,000 556,438,000 539,773,000 551,669,000 570,603,000 584,993,000 607,076,000 637,313,000 657,978,000 669,390,000 652,115,000 645,391,000 648,642,000 647,369,000                                                     
        non - current assets held for sale
      18,892,000 13,953,000  16,892,000 21,945,000                                                                          
        total assets
      12,007,347,000 11,940,036,000 12,200,249,000 12,252,145,000 11,781,867,000 11,818,827,000 12,061,669,000 12,046,598,000 11,457,393,000 11,389,921,000 11,233,398,000 11,426,443,000 11,386,526,000 11,405,670,000 11,139,315,000 11,248,347,000 11,196,063,000 11,443,018,000 11,733,954,000 11,963,091,000 11,983,833,000 12,504,555,000 12,998,951,000 13,045,053,000 13,115,346,000 15,229,359,000 14,461,591,000 14,795,212,000 14,795,212,000 14,737,023,000 14,737,023,000 14,767,650,000 14,767,650,000 14,727,417,000 14,727,417,000 14,617,332,000 14,617,332,000 14,622,951,000 14,622,951,000 13,836,242,000 13,641,041,000 13,508,996,000 13,508,996,000 13,878,327,000 13,878,327,000 13,989,215,000 13,989,215,000 13,529,403,000 13,529,403,000 14,236,126,000 14,016,005,000 14,016,005,000 14,253,269,000 14,253,269,000 5,753,742,000 5,645,278,000 5,837,421,000 5,539,368,000 5,685,144,000 5,808,025,000 5,863,640,000 6,013,232,000 5,994,615,000 5,886,631,000 5,665,358,000 5,620,040,000 3,999,840,000 3,939,343,000 3,833,525,000 3,735,197,000 3,559,499,000 3,535,325,000 2,920,991,000 2,701,933,000 2,531,155,000 2,437,189,000 2,076,196,000  
        liabilities and stockholders’ equity
                                                                                    
        current liabilities:
                                                                                    
        short-term debt
      2,248,000 3,318,000 4,069,000 4,676,000 3,223,000 3,539,000 3,080,000 2,522,000 2,914,000 3,173,000 3,085,000 3,877,000 4,748,000 4,584,000 5,032,000 2,309,000 3,351,000 6,718,000 4,369,000 2,876,000 4,667,000 2,282,000 223,000 10,437,000 27,220,000 55,003,000 47,835,000 44,886,000 44,886,000 48,377,000 48,377,000 46,134,000 46,134,000 47,402,000 47,402,000 9,830,000 9,830,000 2,361,000 2,361,000 1,669,000 21,405,000 14,785,000 14,785,000 20,764,000 20,764,000 10,515,000 10,515,000 3,163,000 3,163,000 8,228,000 11,688,000 11,688,000 49,625,000 49,625,000 27,922,000 26,057,000 33,518,000 12,024,000 14,832,000 18,403,000 2,913,000 2,199,000 12,957,000 19,054,000 28,006,000 6,143,000 5,589,000 13,070,000 30,830,000 5,238,000 1,109,000 12,315,000 12,942,000 2,065,000 3,448,000 2,316,000 9,725,000  
        accounts payable
      2,257,135,000 2,282,480,000 2,260,609,000 2,451,248,000 2,308,284,000 2,348,316,000 2,560,122,000 2,436,736,000 2,304,539,000 2,109,617,000 2,190,755,000 2,106,313,000 2,043,230,000 1,987,306,000 2,027,314,000 1,998,922,000 1,915,617,000 2,044,125,000 2,090,479,000 2,068,440,000 2,115,110,000 2,264,703,000 2,352,144,000 2,098,617,000 2,184,346,000 2,376,867,000 2,954,719,000 2,609,905,000 2,609,905,000 2,581,347,000 2,581,347,000 2,624,561,000 2,624,561,000 2,517,234,000 2,517,234,000 2,286,166,000 2,286,166,000 2,426,469,000 2,426,469,000 2,165,463,000 1,937,110,000 1,967,051,000 1,967,051,000 1,889,254,000 1,889,254,000 1,892,457,000 1,892,457,000 1,904,968,000 1,904,968,000 1,771,051,000 1,682,113,000 1,682,113,000 1,741,934,000 1,741,934,000 704,981,000 753,682,000 803,843,000 711,220,000 682,605,000 698,765,000 738,803,000 712,939,000 739,394,000 596,420,000 551,302,000 553,619,000 397,920,000 413,503,000 364,112,000 353,412,000 382,630,000 415,144,000    235,867,000 264,930,000  
        accrued expenses and other current liabilities
      2,391,931,000 2,404,554,000 2,490,480,000 2,498,168,000 2,352,901,000 2,360,461,000 2,385,731,000 2,414,250,000 2,385,201,000 2,419,998,000 2,287,546,000 2,222,038,000 2,153,844,000 2,196,731,000 2,181,408,000 2,258,984,000 2,218,969,000 2,263,126,000 2,174,201,000 2,335,077,000 2,342,285,000 2,265,731,000 2,211,734,000 2,171,389,000 2,204,433,000 1,937,339,000 2,390,418,000 2,157,870,000 2,157,870,000 2,135,122,000 2,135,122,000 2,180,806,000 2,180,806,000 2,184,672,000 2,184,672,000 2,167,692,000 2,167,692,000 2,072,155,000 2,072,155,000 2,106,615,000 2,119,435,000 2,168,508,000 2,168,508,000 2,401,555,000 2,401,555,000 2,379,803,000 2,379,803,000 2,021,749,000 2,021,749,000 2,112,951,000 1,901,819,000 1,901,819,000 1,854,293,000 1,854,293,000 930,693,000 823,763,000 904,463,000 890,123,000 840,330,000 927,061,000 783,130,000 747,161,000 738,309,000 827,855,000 795,221,000 819,144,000 806,881,000 755,792,000 768,768,000 663,696,000 571,233,000 566,299,000    430,723,000 413,323,000  
        income taxes payable
      37,370,000 37,260,000 23,536,000 40,341,000 25,904,000 30,399,000 27,418,000 44,893,000 36,723,000 59,219,000 48,161,000 48,789,000 43,676,000 55,334,000 46,336,000 50,303,000 61,877,000 57,671,000 50,511,000 50,118,000 38,457,000 47,968,000 47,103,000 35,966,000 31,478,000 60,417,000 59,541,000 43,351,000 43,351,000 36,305,000 36,305,000 48,129,000 48,129,000 28,493,000 28,493,000 28,419,000 28,419,000 18,244,000 18,244,000 21,342,000 10,147,000 10,774,000 10,774,000               5,776,000         2,703,000 2,111,000 20,247,000  2,848,000 11,889,000 12,558,000 2,794,000  36,593,000 40,977,000  
        contract liabilities
      1,123,733,000 1,091,648,000 1,087,905,000 1,165,044,000 1,257,734,000 1,305,640,000 1,298,327,000 1,261,853,000 1,267,045,000 1,282,681,000 1,188,742,000 1,223,150,000 1,177,293,000 1,222,358,000 1,051,258,000 1,051,317,000 996,275,000 1,011,811,000 1,058,643,000 1,080,271,000 985,043,000 1,051,439,000 988,881,000 945,885,000 962,999,000 953,012,000 939,891,000 969,944,000 969,944,000 962,101,000 962,101,000 1,008,202,000 1,008,202,000                                              
        current portion of long-term debt
      60,714,000 62,550,000 62,217,000 68,499,000 67,123,000 65,888,000 63,844,000 63,628,000 88,552,000 88,374,000 86,369,000 52,951,000 52,281,000 48,370,000 43,574,000 42,318,000 39,449,000 41,406,000 49,469,000 52,358,000 42,232,000 21,996,000 20,651,000 14,261,000 25,152,000 56,637,000 69,350,000 114,749,000 114,749,000 109,935,000 109,935,000 114,665,000 114,665,000 125,577,000 125,577,000 123,909,000 123,909,000 160,914,000 160,914,000 155,476,000 331,233,000 343,944,000 343,944,000 333,303,000 333,303,000 331,998,000 331,998,000 153,269,000 153,269,000 162,347,000 164,638,000 164,638,000 152,803,000 152,803,000 38,540,000 56,229,000 57,115,000 1,469,000 152,785,000 193,063,000 116,732,000 86,490,000 10,849,000 11,574,000 11,010,000 12,750,000 9,562,000 9,592,000 15,904,000 14,728,000 13,937,000  17,004,000 16,577,000  4,543,000   
        total current liabilities
      5,873,131,000 5,881,810,000 5,928,816,000 6,227,976,000 6,015,169,000 6,139,555,000 6,374,081,000 6,289,644,000 6,136,115,000 6,002,486,000 5,850,283,000 5,714,775,000 5,537,265,000 5,557,718,000 5,404,171,000 5,464,939,000 5,283,478,000 5,513,463,000 5,521,715,000 5,680,031,000 5,601,897,000 6,001,596,000 6,090,454,000 5,751,671,000 5,987,541,000 6,461,458,000 6,461,754,000 5,940,705,000 5,940,705,000 5,890,187,000 5,890,187,000 6,040,897,000 6,040,897,000 5,890,070,000 5,890,070,000 5,641,841,000 5,641,841,000 5,676,057,000 5,676,057,000 5,189,602,000 5,064,092,000 5,165,328,000 5,165,328,000 5,286,219,000 5,286,219,000 5,260,488,000 5,260,488,000 4,755,094,000 4,755,094,000 4,767,207,000 4,461,104,000 4,461,104,000 4,413,077,000 4,413,077,000 2,053,860,000 2,001,685,000 2,159,670,000 1,941,556,000 2,030,958,000 2,233,124,000 2,005,151,000 1,936,254,000 1,882,957,000 1,818,233,000 1,747,667,000 1,755,065,000 1,566,483,000 1,562,260,000 1,572,668,000 1,518,213,000 1,396,645,000 1,429,881,000 1,197,422,000 1,062,660,000 946,901,000 892,940,000 1,021,564,000  
        other long-term liabilities
      315,878,000 278,057,000 210,870,000 158,597,000 153,268,000 153,122,000 156,406,000 123,402,000 119,797,000 117,108,000 123,846,000 121,211,000 118,057,000 142,995,000 135,795,000 106,315,000 104,355,000 106,872,000 145,444,000 143,286,000 146,225,000 146,642,000 162,784,000 132,047,000 102,980,000 117,738,000 304,606,000 326,588,000 326,588,000 321,348,000 321,348,000 318,941,000 318,941,000 340,116,000 340,116,000 340,938,000 340,938,000 296,578,000 296,578,000 304,268,000 337,368,000 358,755,000 358,755,000 377,095,000 377,095,000 374,858,000 374,858,000 312,271,000 312,271,000 306,110,000 311,595,000 311,595,000 332,473,000 332,473,000 439,446,000 444,265,000 441,340,000 420,721,000 438,139,000 443,003,000 396,057,000 414,397,000 419,954,000 366,809,000 351,464,000 387,988,000 244,118,000 245,607,000 248,227,000 302,161,000 285,003,000 267,547,000 194,446,000 192,945,000 205,652,000 185,903,000 115,160,000  
        operating lease liabilities, non-current
      499,883,000 498,398,000 515,998,000 521,492,000 496,322,000 485,132,000 510,573,000 496,681,000 507,518,000 523,275,000 548,851,000 586,293,000 603,127,000 606,865,000 595,308,000 610,169,000 636,236,000 653,785,000 679,059,000 711,494,000 734,218,000 752,769,000                                                         
        deferred tax liability-net
      74,982,000 68,966,000 67,968,000 44,576,000 43,860,000 29,152,000 27,509,000 17,784,000 16,990,000 16,953,000 16,960,000 9,822,000 9,209,000 14,065,000 9,224,000 6,103,000 5,310,000 5,693,000 5,420,000 6,157,000 5,966,000  3,491,000    4,292,000                                                    
        pension benefit obligations
      113,763,000 123,217,000 133,193,000 145,044,000 150,777,000 156,311,000 172,360,000 168,085,000 179,464,000 190,850,000 195,586,000 224,673,000 229,527,000 236,129,000 232,552,000 320,361,000 350,376,000 371,520,000 383,904,000 439,073,000 451,836,000 444,380,000 443,462,000 355,215,000 368,963,000 392,827,000 505,834,000 372,448,000 372,448,000 388,629,000 388,629,000 393,459,000 393,459,000 515,450,000 515,450,000 548,485,000 548,485,000 548,307,000 548,307,000 656,269,000 653,670,000 660,797,000 660,797,000 499,546,000 499,546,000 526,823,000 526,823,000 544,112,000 544,112,000 584,147,000                             
        long-term debt
      2,654,282,000 2,643,833,000 2,647,220,000 2,455,855,000 2,456,184,000 2,456,012,000 2,450,330,000 2,451,544,000 2,102,358,000 2,110,203,000 2,113,369,000 2,147,039,000 2,152,191,000 2,154,734,000 2,156,686,000 2,162,271,000 2,166,310,000 2,157,881,000 2,157,740,000 2,153,812,000 2,056,728,000 2,044,358,000 2,041,136,000 2,047,988,000 2,079,128,000 3,358,176,000 3,285,755,000 3,653,291,000 3,653,291,000 3,733,642,000 3,733,642,000 3,759,491,000 3,759,491,000 3,707,293,000 3,707,293,000 3,814,976,000 3,814,976,000 3,738,901,000 3,738,901,000 3,753,799,000 3,851,082,000 3,751,342,000 3,751,342,000 3,941,150,000 3,941,150,000 4,130,087,000 4,130,087,000 4,366,424,000 4,366,424,000 4,602,483,000 4,691,571,000 4,691,571,000 4,775,396,000 4,775,396,000 976,963,000 1,008,891,000 1,113,452,000 1,135,226,000 1,123,456,000 1,021,772,000 950,622,000 1,172,279,000 1,217,729,000 1,165,363,000 1,130,125,000 1,187,591,000 173,640,000 178,061,000 140,025,000 221,047,000 275,377,000 362,353,000 58,894,000 32,906,000 30,169,000 56,623,000   
        total liabilities
      9,531,919,000 9,494,281,000 9,504,065,000 9,553,540,000 9,315,580,000 9,419,284,000 9,691,259,000 9,547,922,000 9,063,038,000 8,961,703,000 8,849,687,000 8,804,118,000 8,649,651,000 8,712,777,000 8,533,936,000 8,670,503,000 8,546,410,000 8,816,779,000 8,904,377,000 9,146,113,000 9,057,133,000 9,484,378,000 9,585,407,000 9,159,184,000 9,449,823,000 11,369,955,000 10,562,241,000 10,298,200,000 10,298,200,000 10,342,149,000 10,342,149,000 10,517,221,000 10,517,221,000 10,467,283,000 10,467,283,000 10,352,707,000 10,352,707,000 10,292,170,000 10,292,170,000 9,919,893,000 9,912,851,000 9,949,109,000 9,949,109,000 10,119,120,000 10,119,120,000 10,324,864,000 10,324,864,000 10,010,508,000 10,010,508,000 10,496,059,000 10,295,160,000 10,295,160,000 10,413,957,000 10,413,957,000 3,470,269,000 3,454,841,000 3,714,462,000 3,497,503,000 3,592,553,000 3,697,899,000 3,351,830,000 3,522,930,000 3,520,640,000 3,350,405,000 3,229,256,000 3,330,644,000 1,984,241,000 1,985,928,000 1,960,920,000 2,041,421,000 1,957,025,000 2,059,781,000       
        commitments and contingencies
                                                                                    
        aecom stockholders’ equity:
                                                                                    
        common stock-authorized, 300,000,000 shares of 0.01 par value as of march 31, 2026 and september 30, 2025; issued and outstanding 128,201,913 and 131,782,371 shares as of march 31, 2026 and september 30, 2025, respectively
      1,282,000                                                                              
        additional paid-in capital
      4,641,183,000 4,617,931,000 4,609,126,000 4,426,087,000 4,378,663,000 4,351,963,000 4,347,197,000 4,318,755,000 4,267,719,000 4,245,340,000 4,241,523,000 4,227,027,000 4,176,931,000 4,161,716,000 4,156,594,000 4,139,019,000 4,100,905,000 4,085,333,000 4,115,541,000 4,100,482,000 4,054,089,000 4,038,149,000 4,035,414,000 4,008,202,000 3,960,123,000 3,956,596,000 3,953,650,000 3,930,999,000 3,930,999,000 3,904,298,000 3,904,298,000 3,845,145,000 3,845,145,000 3,820,281,000 3,820,281,000 3,792,929,000 3,792,929,000 3,734,008,000 3,734,008,000 3,665,565,000 3,642,590,000 3,620,291,000 3,620,291,000 3,584,964,000 3,584,964,000 3,564,485,000 3,564,485,000 3,536,242,000 3,536,242,000 3,490,695,000 3,472,488,000 3,472,488,000 3,450,736,000 3,450,736,000 1,848,344,000 1,839,577,000 1,818,821,000 1,798,335,000 1,783,395,000 1,759,881,000 1,731,503,000 1,724,924,000 1,712,456,000 1,693,148,000 1,678,516,000 1,662,764,000 1,540,359,000 1,517,012,000 1,508,796,000 1,438,086,000 1,407,158,000 1,331,948,000 1,285,186,000 1,269,252,000 1,244,075,000 1,253,321,000   
        accumulated other comprehensive loss
      -896,242,000 -888,034,000 -893,027,000 -874,861,000 -943,127,000 -964,794,000 -882,671,000 -914,989,000 -909,970,000 -889,788,000 -926,577,000 -900,815,000 -921,087,000 -918,361,000 -979,675,000 -958,140,000 -864,087,000 -899,172,000 -900,377,000 -910,532,000 -895,736,000 -876,792,000 -918,674,000 -805,613,000 -881,574,000 -822,666,000 -864,197,000 -718,396,000 -718,396,000                                                  
        accumulated deficits
      -1,475,631,000 -1,499,248,000 -1,224,833,000 -1,060,209,000 -1,151,420,000 -1,184,485,000 -1,281,647,000 -1,106,797,000 -1,160,441,000 -1,109,616,000 -1,103,976,000 -872,832,000 -662,891,000 -689,111,000 -701,654,000 -731,265,000 -706,783,000 -676,902,000                                                             
        total aecom stockholders’ equity
      2,270,592,000 2,231,942,000 2,492,584,000 2,492,340,000 2,285,436,000 2,204,010,000 2,184,205,000 2,298,326,000 2,198,667,000 2,247,296,000 2,212,332,000 2,454,765,000 2,594,340,000 2,555,634,000 2,476,654,000 2,451,010,000 2,531,442,000 2,510,672,000 2,712,470,000 2,708,037,000 2,822,969,000 2,908,204,000 3,292,558,000 3,744,894,000 3,531,502,000 3,673,002,000 3,690,576,000 4,303,004,000 4,303,004,000 4,199,936,000 4,199,936,000 4,077,800,000 4,077,800,000 4,077,732,000 4,077,732,000 4,040,752,000 4,040,752,000 4,104,369,000 4,104,369,000 3,708,618,000 3,544,392,000 3,378,413,000 3,378,413,000 3,551,842,000 3,551,842,000 3,458,440,000 3,458,440,000 3,314,581,000 3,314,581,000 3,474,924,000 3,429,567,000 3,429,567,000 3,550,220,000 3,550,220,000 2,197,512,000 2,100,189,000 2,036,266,000 1,985,730,000 2,035,979,000 2,049,468,000 2,455,750,000 2,433,830,000 2,412,306,000 2,481,310,000 2,383,630,000 2,236,617,000 1,970,694,000 1,911,240,000 1,839,893,000          
        noncontrolling interests
      204,836,000 213,813,000 203,600,000 206,265,000 180,851,000 195,533,000 186,205,000 200,350,000 195,688,000 180,922,000 171,379,000 167,560,000 142,535,000 137,259,000 128,725,000 126,834,000 118,211,000 115,567,000 117,107,000 108,941,000 103,731,000 111,973,000 120,986,000 140,975,000 134,021,000 186,402,000 208,774,000 194,008,000 194,008,000 194,938,000 194,938,000 172,629,000 172,629,000 182,402,000 182,402,000 223,873,000 223,873,000 226,412,000 226,412,000 207,731,000 183,798,000 181,474,000 181,474,000 207,365,000 207,365,000 205,911,000 205,911,000 204,314,000 204,314,000 265,143,000 291,278,000 291,278,000 289,092,000 289,092,000 85,961,000 90,248,000 86,693,000 56,135,000 56,612,000 60,658,000 56,060,000 56,472,000 61,669,000 54,916,000 52,472,000 52,779,000 44,905,000 42,175,000 32,712,000          
        total stockholders’ equity
      2,475,428,000 2,445,755,000 2,696,184,000 2,698,605,000 2,466,287,000 2,399,543,000 2,370,410,000 2,498,676,000 2,394,355,000 2,428,218,000 2,383,711,000 2,622,325,000 2,736,875,000 2,692,893,000 2,605,379,000 2,577,844,000 2,649,653,000 2,626,239,000 2,829,577,000 2,816,978,000 2,926,700,000 3,020,177,000 3,413,544,000 3,885,869,000 3,665,523,000 3,859,404,000 3,899,350,000 4,497,012,000 4,497,012,000 4,394,874,000 4,394,874,000 4,250,429,000 4,250,429,000 4,260,134,000 4,260,134,000 4,264,625,000 4,264,625,000 4,330,781,000 4,330,781,000 3,916,349,000 3,728,190,000 3,559,887,000 3,559,887,000 3,759,207,000 3,759,207,000 3,664,351,000 3,664,351,000 3,518,895,000 3,518,895,000 3,740,067,000 3,720,845,000 3,720,845,000 3,839,312,000 3,839,312,000 2,283,473,000 2,190,437,000 2,122,959,000 2,041,865,000 2,092,591,000 2,110,126,000 2,511,810,000 2,490,302,000 2,473,975,000 2,536,226,000 2,436,102,000 2,289,396,000 2,015,599,000 1,953,415,000 1,872,605,000 1,666,301,000 1,551,465,000 1,428,039,000 1,448,751,000 1,387,138,000 1,326,189,000    
        total liabilities and stockholders’ equity
      12,007,347,000 11,940,036,000 12,200,249,000 12,252,145,000 11,781,867,000 11,818,827,000 12,061,669,000 12,046,598,000 11,457,393,000 11,389,921,000 11,233,398,000 11,426,443,000 11,386,526,000 11,405,670,000 11,139,315,000 11,248,347,000 11,196,063,000 11,443,018,000 11,733,954,000 11,963,091,000 11,983,833,000 12,504,555,000 12,998,951,000 13,045,053,000 13,115,346,000 15,229,359,000 14,461,591,000 14,795,212,000 14,795,212,000 14,737,023,000 14,737,023,000 14,767,650,000 14,767,650,000 14,727,417,000 14,727,417,000 14,617,332,000 14,617,332,000 14,622,951,000 14,622,951,000 13,836,242,000 13,641,041,000 13,508,996,000 13,508,996,000 13,878,327,000 13,878,327,000 13,989,215,000 13,989,215,000 13,529,403,000 13,529,403,000 14,236,126,000 14,016,005,000 14,016,005,000 14,253,269,000 14,253,269,000 5,753,742,000 5,645,278,000 5,837,421,000 5,539,368,000 5,685,144,000 5,808,025,000 5,863,640,000 6,013,232,000 5,994,615,000 5,886,631,000 5,665,358,000 5,620,040,000 3,999,840,000 3,939,343,000 3,833,525,000 3,735,197,000 3,559,499,000 3,535,325,000 2,920,991,000 2,701,933,000 2,531,155,000    
        common stock-authorized, 300,000,000 shares of 0.01 par value as of december 31, 2025 and september 30, 2025; issued and outstanding 129,286,286 and 131,782,371 shares as of december 31, 2025 and september 30, 2025, respectively
       1,293,000                                                                             
        current assets held for sale
           67,128,000 77,224,000 135,970,000 105,091,000 85,896,000 95,221,000 108,592,000 110,574,000 72,588,000 79,000,000 94,542,000 77,662,000 107,849,000 139,426,000 127,017,000 102,859,000 666,724,000 716,727,000 743,819,000 799,818,000 1,641,896,000    55,000,000 55,000,000 58,700,000 58,700,000 63,303,000 63,303,000 116,755,000 116,755,000                                3,791,000  81,359,000        
        non-current assets held for sale
        18,953,000             7,939,000 6,777,000    58,829,000 141,213,000 126,994,000 395,325,000 338,673,000 2,446,381,000                                                     
        current liabilities held for sale
           25,312,000 35,559,000 65,762,000 51,141,000 39,424,000 45,625,000 57,657,000 62,193,000 43,035,000 49,249,000 60,786,000 47,940,000 88,606,000 94,043,000 90,891,000 74,103,000 347,477,000 469,718,000 475,116,000 551,913,000 1,022,183,000    17,000,000 17,000,000 18,400,000 18,400,000 17,914,000 17,914,000 46,459,000 46,459,000                                1,161,000  81,647,000 76,883,000       
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2025 and 2024; issued and outstanding 131,782,371 and 132,552,407 shares as of september 30, 2025 and 2024, respectively
        1,318,000                                                                            
        common stock-authorized, 300,000,000 shares of 0.01 par value as of june 30, 2025 and september 30, 2024; issued and outstanding 132,318,294 and 132,552,407 shares as of june 30, 2025 and september 30, 2024, respectively
         1,323,000                                                                           
        common stock-authorized, 300,000,000 shares of 0.01 par value as of march 31, 2025 and september 30, 2024; issued and outstanding 132,019,854 and 132,552,407 shares as of march 31, 2025 and september 30, 2024, respectively
          1,320,000                                                                          
        common stock-authorized, 300,000,000 shares of 0.01 par value as of december 31, 2024 and september 30, 2024; issued and outstanding 132,638,253 and 132,552,407 shares as of december 31, 2024 and september 30, 2024, respectively
           1,326,000                                                                         
        long-term liabilities held for sale
             782,000 796,000 828,000 792,000 305,000 275,000 271,000 200,000 345,000 345,000 7,565,000 11,095,000 12,260,000 60,263,000 88,990,000 98,793,000 96,915,000 97,062,000 269,604,000                                                     
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2024 and 2023; issued and outstanding 132,552,407 and 136,210,883 shares as of september 30, 2024 and 2023, respectively
            1,326,000                                                                        
        common stock-authorized, 300,000,000 shares of 0.01 par value as of june 30, 2024 and september 30, 2023; issued and outstanding 135,702,623 and 136,210,883 shares as of june 30, 2024 and september 30, 2023, respectively
             1,357,000                                                                       
        common stock-authorized, 300,000,000 shares of 0.01 par value as of march 31, 2024 and september 30, 2023; issued and outstanding 135,872,491 and 136,210,883 shares as of march 31, 2024 and september 30, 2023, respectively
              1,359,000                                                                      
        common stock-authorized, 300,000,000 shares of 0.01 par value as of december 31, 2023 and september 30, 2023; issued and outstanding 136,018,182 and 136,210,883 shares as of december 31, 2023 and september 30, 2023, respectively
               1,360,000                                                                     
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2023 and 2022; issued and outstanding 136,210,883 and 138,933,907 shares as of september 30, 2023 and 2022, respectively
                1,362,000                                                                    
        common stock-authorized, 300,000,000 shares of 0.01 par value as of june 30, 2023 and september 30, 2022; issued and outstanding 138,499,043 and 138,933,907 shares as of june 30, 2023 and september 30, 2022, respectively
                 1,385,000                                                                   
        common stock-authorized, 300,000,000 shares of 0.01 par value as of march 31, 2023 and september 30, 2022; issued and outstanding 138,724,105 and 138,933,907 shares as of march 31, 2023 and september 30, 2022, respectively
                  1,387,000                                                                  
        common stock-authorized, 300,000,000 shares of 0.01 par value as of december 31, 2022 and september 30, 2022; issued and outstanding 138,953,354 and 138,933,907 shares as of december 31, 2022 and september 30, 2022, respectively
                   1,390,000                                                                 
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2022 and 2021; issued and outstanding 138,933,907 and 143,168,815 shares as of september 30, 2022 and 2021, respectively
                    1,389,000                                                                
        common stock-authorized, 300,000,000 shares of 0.01 par value as of june 30, 2022 and september 30, 2021; issued and outstanding 139,578,447 and 143,168,815 shares as of june 30, 2022 and september 30, 2021, respectively
                     1,396,000                                                               
        common stock-authorized, 300,000,000 shares of 0.01 par value as of march 31, 2022 and september 30, 2021; issued and outstanding 140,742,683 and 143,168,815 shares as of march 31, 2022 and september 30, 2021, respectively
                      1,407,000                                                              
        common stock-authorized, 300,000,000 shares of 0.01 par value as of december 31, 2021 and september 30, 2021; issued and outstanding 141,335,424 and 143,168,815 shares as of december 31, 2021 and september 30, 2021, respectively
                       1,413,000                                                             
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2021 and 2020; issued and outstanding 143,168,815 and 157,044,687 shares as of september 30, 2021 and 2020, respectively
                        1,432,000                                                            
        (accumulated deficits) / retained earnings
                        -504,126,000 -483,362,000                                                           
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2021 and september 30, 2020; issued and outstanding 144,877,676 and 157,044,687 shares as of june 30, 2021 and september 30, 2020, respectively
                         1,449,000                                                           
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2021 and september 30, 2020; issued and outstanding 146,751,065 and 157,044,687 shares as of march 31, 2021 and september 30, 2020, respectively
                          1,468,000                                                          
        (accumulated deficits) retained earnings
                          -336,852,000 -254,639,000                                                         
        deferred tax liability—net
                           5,643,000  37,910,000 76,117,000 25,122,000  5,168,000 5,168,000 8,343,000 8,343,000 4,433,000 4,433,000 14,354,000 14,354,000 6,467,000 6,467,000 32,327,000 32,327,000 15,955,000 6,639,000 12,887,000 12,887,000 15,110,000 15,110,000 32,608,000 32,608,000 32,607,000 32,607,000 27,695,000 27,695,000 27,695,000 27,293,000 27,293,000          1,534,000 3,288,000 5,147,000          11,784,000 11,551,000  
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31, 2020 and september 30, 2020; issued and outstanding 148,576,375 and 157,044,687 shares as of december 31, 2020 and september 30, 2020, respectively
                           1,486,000                                                         
        operating lease liabilities
                            745,287,000 737,438,000 738,032,000 745,030,000                                                     
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2020 and 2019; issued and outstanding 157,044,687 and 157,482,983 shares as of september 30, 2020 and 2019, respectively
                            1,570,000                                                        
        retained earnings
                            174,248,000 540,703,000 451,364,000 537,490,000 599,548,000 1,088,824,000 1,088,824,000 1,005,086,000 1,005,086,000 957,230,000 957,230,000 1,014,131,000 1,014,131,000 953,221,000 953,221,000 1,072,954,000 1,072,954,000 873,152,000 771,825,000 669,429,000 669,429,000 611,241,000 611,241,000 543,797,000 543,797,000 501,969,000 501,969,000 521,280,000 538,472,000 538,472,000 573,678,000 573,678,000 613,155,000 543,916,000 503,724,000 457,249,000 460,197,000 471,199,000 893,311,000 849,169,000 867,605,000 839,520,000 765,686,000 707,971,000 583,355,000 518,547,000 460,092,000 354,135,000 303,162,000 259,893,000 178,015,000 139,631,000 104,000,000 45,301,000 21,111,000  
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2020 and september 30, 2019; issued and outstanding 160,213,426 and 157,482,983 shares as of june 30, 2020 and september 30, 2019, respectively
                             1,602,000                                                       
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2020 and september 30, 2019; issued and outstanding 158,908,063 and 157,482,983 shares as of march 31, 2020 and september 30, 2019, respectively
                              1,589,000                                                      
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31, 2019 and september 30, 2019; issued and outstanding 158,192,180 and 157,482,983 shares as of december 31, 2019 and september 30, 2019, respectively
                               1,582,000                                                     
        common stock—authorized, 300,000,000 shares of 0.01 par value as of september 30, 2019 and 2018; issued and outstanding 157,482,983 and 156,983,356 shares as of september 30, 2019 and 2018, respectively
                                1,575,000                                                    
        ​
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2019 and september 30, 2018; issued and outstanding 157,659,181 and 156,983,356 shares as of june 30, 2019 and september 30, 2018, respectively
                                 1,577,000 1,577,000                                                  
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2019 and september 30, 2018; issued and outstanding 157,338,763 and 156,983,356 shares as of march 31, 2019 and september 30, 2018, respectively
                                   1,573,000 1,573,000                                                
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2018; issued and outstanding 156,967,362 and 156,983,356 shares as of december 31 and september 30, 2018, respectively
                                     1,570,000 1,570,000                                              
        billings in excess of costs on uncompleted contracts
                                       968,778,000 968,778,000 979,366,000 979,366,000 995,914,000 995,914,000 739,037,000 644,762,000 660,266,000 660,266,000 641,343,000 641,343,000 645,715,000 645,715,000 671,945,000 671,945,000 684,935,000 673,151,000 673,151,000 587,129,000 587,129,000 351,724,000 341,954,000 360,731,000 320,944,000 340,406,000 395,832,000 363,573,000 387,465,000 381,448,000 361,796,000 358,840,000 358,262,000 343,828,000 368,192,000 371,646,000 342,587,000 343,241,000 330,365,000 267,360,000 232,562,000 215,826,000 171,114,000 200,891,000  
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2018 and september 30, 2017; issued and outstanding 160,693,918 and 157,529,419 shares as of june 30, 2018 and september 30, 2017, respectively
                                       1,607,000 1,607,000                                            
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2018 and september 30, 2017; issued and outstanding 160,237,598 and 157,529,419 shares as of march 31, 2018 and september 30, 2017, respectively
                                         1,602,000 1,602,000                                          
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2017; issued and outstanding 159,132,336 and 157,529,419 shares as of december 31 and september 30, 2017, respectively
                                           1,591,000 1,591,000                                        
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2017 and september 30, 2016; issued and outstanding 155,979,660 and 153,901,500 shares as of june 30, 2017 and september 30, 2016, respectively
                                             1,560,000                                       
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2017 and september 30, 2016; issued and outstanding 155,529,396 and 153,901,500 shares as of march 31, 2017 and september 30, 2016, respectively
                                              1,555,000                                      
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2016; issued and outstanding 155,143,497 and 153,901,500 shares as of december 31 and september 30, 2016, respectively
                                               1,551,000 1,551,000                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2016 and september 30, 2015; issued and outstanding 153,533,311 and 151,263,650 shares as of june 30, 2016 and september 30, 2015, respectively
                                                 1,535,000 1,535,000                                  
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2016 and september 30, 2015; issued and outstanding 152,913,313 and 151,263,650 shares as of march 31, 2016 and september 30, 2015, respectively
                                                   1,529,000 1,529,000                                
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2015; issued and outstanding 152,452,910 and 151,263,650 shares as of december 31 and september 30, 2015, respectively
                                                     1,525,000 1,525,000                              
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2015 and september 30, 2014; issued and outstanding 150,732,952 and 96,715,797 shares as of june 30, 2015 and september 30, 2014, respectively
                                                       1,507,000                             
        pension and post-retirement benefit obligations
                                                        578,874,000 578,874,000 599,783,000 599,783,000                         
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2015 and september 30, 2014; issued and outstanding 150,029,227 and 96,715,797 shares as of march 31, 2015 and september 30, 2014, respectively
                                                        1,500,000 1,500,000                           
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2014; issued and outstanding 149,727,935 and 96,715,797 shares as of december 31 and september 30, 2014, respectively
                                                          1,497,000 1,497,000                         
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 1 and 2 shares as of june 30, 2014 and september 30, 2013, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2014 and september 30, 2013; issued and outstanding 96,405,640 and 96,016,358 shares as of june 30, 2014 and september 30, 2013, respectively
                                                            964,000                        
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 1 and 2 shares as of march 31, 2014 and september 30, 2013, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2014 and september 30, 2013; issued and outstanding 96,201,286 and 96,016,358 shares as of march 31, 2014 and september 30, 2013, respectively
                                                             962,000                       
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 2 shares as of december 31 and september 30, 2013; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2013; issued and outstanding 95,781,448 and 96,016,358 shares as of december 31 and september 30, 2013, respectively
                                                              958,000                      
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 2 and 3 shares as of june 30, 2013 and september 30, 2012, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2013 and september 30, 2012; issued and outstanding, 97,617,749 and 107,041,003 as of june 30, 2013 and september 30, 2012, respectively
                                                               976,000                     
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 2 and 3 shares as of march 31, 2013 and september 30, 2012, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2013 and september 30, 2012; issued and outstanding, 99,364,985 and 107,041,003 as of march 31, 2013 and september 30, 2012, respectively
                                                                994,000                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 3 shares as of december 31 and september 30, 2012; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2012; issued and outstanding, 100,935,219 and 107,041,003 as of december 31 and september 30, 2012, respectively
                                                                 1,009,000                   
        common stock—authorized, 300,000,000 shares of 0.01 par value as of june 30, 2012 and september 30, 2011; issued and outstanding, 109,928,128 and 113,248,337 as of june 30, 2012 and september 30, 2011, respectively
                                                                  1,099,000                  
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 3 shares as of june 30, 2012 and september 30, 2011; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of march 31, 2012 and september 30, 2011; issued and outstanding, 110,825,835 and 113,248,337 as of march 31, 2012 and september 30, 2011, respectively
                                                                   1,108,000                 
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 3 shares as of march 31, 2012 and september 30, 2011; no par value, 1.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 shares of 0.01 par value as of december 31 and september 30, 2011; issued and outstanding, 113,857,161 and 113,248,337 as of december 31 and september 30, 2011, respectively
                                                                    1,139,000                
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 3 shares as of december 31 and september 30, 2011; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 2,500,000; issued and outstanding, 0 and 2,305 shares as of june 30, 2011 and september 30, 2010, respectively; 100.00 liquidation preference value
                                                                                    
        common stock—authorized, 300,000,000 and 150,000,000 shares of 0.01 par value as of june 30, 2011 and september 30, 2010, respectively; issued and outstanding, 117,624,144 and 115,316,783 as of june 30, 2011 and september 30, 2010, respectively
                                                                     1,176,000               
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 0 and 52 shares as of june 30, 2011 and september 30, 2010, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 4 shares as of june 30, 2011 and september 30, 2010; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 2,500,000; issued and outstanding, 0 and 2,305 shares as of march 31, 2011 and september 30, 2010; respectively, 100.00 liquidation preference value
                                                                                    
        common stock—authorized, 150,000,000 shares of 0.01 par value...
                                                                      1,175,000 1,167,000 1,138,000 1,132,000 1,126,000 1,096,000 1,083,000 1,041,000 1,023,000 1,011,000 998,000 982,000   
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 0 and 52 shares as of march 31, 2011 and september 30, 2010; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 4 and 4 shares as of march 31, 2011 and september 30, 2010; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 2,500,000; issued and outstanding, 0 and 2,305 shares as of december 31 and september 30, 2010; respectively, 100.00 liquidation preference value
                                                                                    
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 0 and 52 shares as of december 31 and september 30, 2010; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 4 and 4 shares as of december 31 and september 30, 2010; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 2,500,000; issued and outstanding, 24,405 and 25,130 shares as of june 30, 2010 and september 30, 2009, respectively; 100.00 liquidation preference value
                                                                        2,441,000            
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 52 and 56 shares as of june 30, 2010 and september 30, 2009, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 4 and 5 shares as of june 30, 2010 and september 30, 2009, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 24,578 and 25,130 shares at march 31, 2010 and september 30, 2009; respectively, 100.00 liquidation preference value
                                                                         2,458,000           
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 53 and 56 shares as of march 31, 2010 and september 30, 2009, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 4 and 5 shares as of march 31, 2010 and september 30, 2009; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 24,800 and 25,130 shares at december 31 and september 30, 2009; respectively, 100.00 liquidation preference value
                                                                          2,480,000          
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 56 shares as of december 31 and september 30, 2009; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 shares as of december 31 and september 30, 2009; no par value, 1.00 liquidation preference value
                                                                                    
        marketable securities
                                                                                3,179,000    
        assets held for sale
                                                                           163,947,000         
        liabilities held for sale
                                                                           138,552,000         
        minority interest
                                                                           27,475,000 51,009,000 47,505,000 21,478,000 26,284,000 22,244,000 17,818,000 16,904,000  
        stockholders’ equity:
                                                                                    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 24,788 and 26,423 shares at june 30, 2009 and september 30, 2008; respectively, 100.00 liquidation preference value
                                                                           2,479,000         
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 57 and 69 shares as of june 30, 2009 and september 30, 2008, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 and 5 shares as of june 30, 2009 and september 30, 2008, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 24,724 and 26,423 shares at march 31, 2009 and september 30, 2008; respectively, 100.00 liquidation preference value
                                                                            2,472,000        
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 56 and 69 shares as of march 31, 2009 and september 30, 2008, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 7 and 5 shares as of march 31, 2009 and september 30, 2008, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        other current assets held for sale
                                                                             81,535,000       
        deferred tax asset—net
                                                                             35,768,000       
        current portion of long-term obligations
                                                                             16,986,000   14,315,000  23,533,000  
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 25,201 and 26,423 shares at december 31 and september 30, 2008; respectively, 100.00 liquidation preference value
                                                                             2,520,000       
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 70 and 69 shares as of december 31 and september 30, 2008, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 shares as of december 31 and september 30, 2008; no par value, 1.00 liquidation preference value
                                                                                    
        accounts receivable – net
                                                                              1,405,388,000 1,335,191,000     
        goodwill—net
                                                                              766,068,000 663,110,000 627,944,000    
        accounts payable and other current liabilities
                                                                              269,157,000 257,250,000 230,427,000    
        accrued expenses
                                                                              591,277,000 528,293,000 464,182,000    
        deferred tax liability – net
                                                                              27,124,000 23,119,000 18,703,000    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 26,842 and 49,779 shares at june 30, 2008 and september 30, 2007, respectively; 100 liquidation preference value
                                                                              2,684,000      
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 69 and 72 shares as of june 30, 2008 and september 30, 2007, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 shares as of june 30, 2008 and september 30, 2007; no par value, 1.00 liquidation preference value
                                                                                    
        property and equipment:
                                                                                    
        equipment, furniture and fixtures
                                                                               138,275,000 128,261,000 122,439,000 109,214,000  
        leasehold improvements
                                                                               65,676,000 55,332,000 40,928,000 38,147,000  
        total
                                                                               203,951,000 183,593,000 163,367,000 147,361,000  
        accumulated depreciation and amortization
                                                                                    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 29,367 and 49,779 shares at march 31, 2008 and september 30, 2007; respectively, 100 liquidation preference value
                                                                               2,937,000     
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 71 and 72 shares as of march 31, 2008 and september 30, 2007, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 shares as of march 31, 2008 and september 30, 2007; no par value, 1.00 liquidation preference value
                                                                                    
        accounts receivable–net
                                                                                1,168,047,000    
        convertible preferred stock—authorized, 7,799,780; issued and outstanding, 42,370 and 49,779 shares at december 31 and september 30, 2007; respectively, 100 liquidation preference value
                                                                                4,237,000    
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 71 and 72 shares as of december 31 and september 30, 2007, respectively; no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5 shares as of december 31 and september 30, 2007; no par value, 1.00 liquidation preference value
                                                                                    
        deferred income taxes—net
                                                                                 103,524,000   
        investments in unconsolidated subsidiaries
                                                                                 22,493,000 20,589,000  
        intangible and other assets—net
                                                                                 33,916,000 44,068,000  
        liabilities and stockholders’ (deficit) / equity
                                                                                    
        share purchase liability
                                                                                  56,634,000  
        redeemable common and preferred stock and stock units
                                                                                  832,624,000  
        notes receivable from stockholders
                                                                                    
        redeemable preferred stock, class f—47,000 and 0 authorized, issued and outstanding as of september 30, 2006 and june 30, 2007, respectively, 2,500 liquidation preference value
                                                                                    
        redeemable preferred stock, class g—47,000 and 0 authorized, issued and outstanding as of september 30, 2006 and june 30, 2007, respectively, 2,500 liquidation preference value
                                                                                    
        stockholders’ (deficit) / equity:
                                                                                    
        convertible preferred stock—authorized, 7,799,780 shares; issued and outstanding 56,203 shares and 46,741 shares as of september 30, 2006 and june 30, 2007, respectively, 100 liquidation preference value
                                                                                 4,674,000   
        preferred stock, class c—authorized, 200 shares; issued and outstanding, 56.297 and 71.368 as of september 30, 2006 and june 30, 2007, respectively, no par value, 1.00 liquidation preference value
                                                                                    
        preferred stock, class e—authorized, 20 shares; issued and outstanding, 5.427 and 5.736 as of september 30, 2006 and june 30, 2007, respectively, no par value, 1.00 liquidation preference value
                                                                                    
        total stockholders’ (deficit) / equity
                                                                                 1,283,905,000   
        total liabilities and stockholders’ (deficit) / equity
                                                                                 2,437,189,000   
        revenue
                                                                                 1,100,656,000   
        cost of revenue
                                                                                 788,565,000   
        gross profit
                                                                                 312,091,000   
        equity in earnings of joint ventures
                                                                                 3,992,000   
        general and administrative expenses
                                                                                 270,401,000   
        income from operations
                                                                                 45,682,000   
        minority interest in share of earnings
                                                                                 3,824,000   
        gain on the sale of equity investment
                                                                                    
        interest expense — net
                                                                                 6,312,000   
        income before income tax expense
                                                                                 35,546,000   
        income tax expense
                                                                                 11,360,000   
        net income
                                                                                 24,186,000   
        net income allocation:
                                                                                    
        preferred stock dividend
                                                                                 68,000   
        net income available for common stockholders
                                                                                 24,118,000   
        earnings per share:
                                                                                    
        basic
                                                                                 300   
        diluted
                                                                                 260   
        weighted-average common shares outstanding:
                                                                                    
        short-term investments
                                                                                  50,000  
        deferred income taxes
                                                                                  110,178,000  
        deferred loan costs
                                                                                  1,404,000  
        liabilities and stockholders’ deficit
                                                                                    
        long-term obligations
                                                                                  153,118,000  
        redeemable preferred stock, class f—47,000 authorized, issued and outstanding as of september 30, 2006 and march 31, 2007, 2,500 liquidation preference value per share
                                                                                  117,500,000  
        redeemable preferred stock, class g—47,000 authorized, issued and outstanding as of september 30, 2006 and march 31, 2007, 2,500 liquidation preference value per share
                                                                                  117,500,000  
        stockholders’ deficit:
                                                                                    
        total stockholders’ deficit
                                                                                    
        total liabilities and stockholders’ deficit
                                                                                  2,076,196,000  
        total stockholders' (deficit)/equity
                                                                                    
        total liabilities and stockholders' (deficit)/equity
                                                                                    
      Cashflow Statements:
      Quarterly
      Annual
        Unit: USD2026-04-03 2026-01-02 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 2019-06-28 2019-03-29 2018-12-31 2018-12-28 2018-06-29 2018-03-30 2017-12-31 2017-12-29 2017-06-30 2017-03-31 2016-12-31 2016-12-30 2016-06-30 2016-03-31 2016-01-01 2015-12-31 2015-06-30 2015-03-31 2015-01-02 2014-12-31 2014-06-30 2014-03-31 2013-12-31 2013-06-30 2013-03-31 2012-12-31 2012-06-30 2012-03-31 2011-12-31 2011-06-30 2011-03-31 2010-12-31 2010-06-30 2010-03-31 2009-12-31 2009-06-30 2009-03-31 2008-12-31 2008-06-30 2008-03-31 2007-12-31 2007-06-30 
                                                                             
          cash flows from operating activities:
                                                                             
          net income
        190,448,000 93,352,000 137,706,000 159,737,000 159,540,000 179,204,000 183,122,000 152,509,000 16,030,000 108,594,000 40,194,000 -121,299,000 84,483,000 96,763,000 113,003,000 111,909,000 48,513,000 61,277,000 106,307,000 18,373,000 45,278,000 33,022,000 -223,991,000 94,122,000 -76,966,000 53,094,000  105,388,000 93,519,000 65,086,000 65,086,000 75,142,000 -107,755,000 124,413,000 124,413,000 136,074,000 115,840,000 65,778,000 65,778,000 84,394,000   -403,000  -17,133,000 -80,330,000 -80,330,000 69,092,000 42,496,000 56,541,000 71,215,000 54,776,000 38,978,000 69,855,000 49,656,000 48,424,000 73,931,000 59,660,000 62,083,000 68,635,000 61,654,000 49,867,000 51,121,000 43,398,000 40,905,000 38,454,000 35,829,000 29,493,000 24,187,000 
          adjustments to reconcile net income to net cash from operating activities:
                                                                             
          depreciation and amortization
        59,484,000 52,036,000 47,542,000 44,548,000 41,530,000 42,297,000 44,939,000 46,365,000 44,186,000 43,322,000 44,678,000 43,261,000 44,189,000 43,597,000 44,281,000 41,429,000 43,803,000 41,373,000 47,112,000 48,460,000 41,305,000 39,523,000 55,936,000 55,749,000 67,816,000 57,875,000  64,768,000 65,556,000 63,160,000 63,160,000 66,658,000 70,648,000 62,835,000 62,835,000 67,112,000 71,950,000 66,916,000 66,916,000 97,261,000 107,181,000 111,018,000 111,018,000 134,700,000 214,322,000 102,122,000 102,122,000 24,328,000 23,944,000 22,198,000 23,532,000 23,937,000 23,902,000 26,085,000 25,260,000 25,548,000 28,091,000 27,311,000 29,843,000 17,241,000 18,164,000 22,340,000 21,653,000 20,039,000 19,095,000 18,738,000 9,773,000 11,567,000 12,008,000 
          equity in earnings of unconsolidated joint ventures
        -7,022,000 -9,377,000           -7,456,000 -8,089,000 -24,382,000 -5,402,000 -11,919,000 -4,600,000 -10,810,000 -4,910,000 -7,507,000 -15,877,000 -19,195,000 2,539,000 8,177,000 -14,800,000                                            
          distribution of earnings from unconsolidated joint ventures
        6,154,000 5,297,000 7,354,000 25,358,000 24,032,000 2,754,000 9,113,000 2,238,000 5,469,000 7,434,000 9,300,000 4,752,000 6,415,000 20,711,000 8,368,000 5,400,000 3,120,000 10,287,000 19,804,000 9,849,000 3,925,000 12,780,000 42,483,000 11,503,000 19,305,000 16,867,000  9,973,000 17,267,000 13,955,000 13,955,000 13,854,000 33,033,000 39,480,000 39,480,000 71,063,000 15,501,000 24,370,000 24,370,000 37,878,000 43,848,000 39,370,000 39,370,000 34,771,000 31,155,000 42,213,000 42,213,000 3,474,000 5,550,000 9,170,000 5,404,000 4,537,000 11,332,000 11,851,000 2,226,000 7,837,000 15,121,000 6,319,000 7,682,000 3,592,000 995,000 3,240,000    4,107,000   2,216,000 
          non-cash stock compensation
        14,788,000 16,011,000 15,376,000 15,306,000 13,934,000 16,823,000 16,706,000 14,203,000 15,559,000 15,052,000 5,002,000 16,285,000 12,702,000 11,893,000 11,060,000 5,692,000 11,905,000 9,814,000 8,529,000 11,591,000 9,259,000 15,363,000 17,192,000 10,500,000 5,282,000 21,255,000  15,656,000 16,162,000 15,631,000 15,631,000 17,145,000 20,656,000 16,540,000 16,540,000 20,621,000 16,716,000 21,337,000 21,337,000 14,167,000 20,533,000 21,500,000 21,500,000 20,226,000 15,547,000 36,017,000 36,017,000 4,799,000 10,246,000 10,941,000 9,240,000 11,330,000 6,834,000 2,047,000 9,009,000 8,634,000 9,157,000 4,024,000 8,030,000 8,672,000 7,652,000 8,813,000 6,929,000 6,828,000 5,457,000     
          non-cash net fair value losses
                                                                             
          non-cash loss on disposal activities
        61,800,000                                                                    
          foreign currency translation
        3,201,000 616,000 -3,288,000 23,866,000 10,409,000 -28,671,000 11,798,000 -4,455,000 -8,462,000 16,587,000 -6,219,000 420,000 -3,820,000 10,588,000 -1,321,000 -44,796,000 14,308,000 280,000 -9,410,000 -25,014,000 -16,258,000 7,954,000 -72,537,000 47,536,000 -22,995,000 16,077,000                            -4,854,000 1,684,000 3,740,000 -1,380,000    2,548,000 2,425,000       3,620,000 
          other
        -333,000 -151,000 -8,536,000 1,880,000 12,399,000 -4,827,000 -9,506,000 4,926,000 -821,000 547,000 1,744,000 2,029,000 1,378,000 1,237,000 4,374,000 2,862,000 5,805,000 2,254,000 4,901,000 5,784,000 1,102,000 4,276,000   1,117,000 4,127,000  444,000 1,966,000 2,425,000 2,425,000 -1,130,000        -482,000        -182,000 1,837,000 1,185,000 794,000 357,000 837,000                 
          changes in operating assets and liabilities, net of effects of acquisitions:
                                                                             
          accounts receivable and contract assets
        -245,042,000 -101,572,000 237,901,000 -114,631,000 49,640,000 161,509,000 13,609,000 -130,873,000 -200,168,000 -183,366,000 50,204,000 -76,697,000 -160,229,000 -215,776,000 164,465,000 -67,511,000 51,520,000 88,131,000 159,758,000 114,189,000 256,990,000 2,069,000 179,028,000 172,702,000 -359,684,000 -129,001,000                                            
          prepaid expenses and other assets
        -46,169,000 35,273,000 -21,345,000 -65,002,000 -32,798,000 36,438,000 -227,972,000 26,238,000 6,129,000 -11,754,000 136,030,000 -28,263,000 46,092,000 -21,956,000 -692,000 64,904,000 37,414,000 30,377,000 189,513,000 -8,294,000 -148,147,000 -133,598,000 19,218,000 -44,897,000 22,483,000 -28,619,000  1,161,000                  31,172,000 31,172,000   19,733,000    17,134,000     4,177,000    -21,813,000 6,252,000 17,442,000 -17,576,000 31,488,000 1,624,000  
          accounts payable
        -26,332,000 28,660,000 -172,923,000 92,371,000 -38,112,000 -214,900,000 100,589,000 142,994,000 207,859,000 -60,266,000 73,481,000 64,491,000 83,734,000 -52,192,000 78,845,000 15,534,000 -142,541,000 -54,711,000 21,805,000 -29,420,000 -123,502,000 -119,025,000 192,499,000 -118,621,000 -175,483,000 -91,375,000      209,044,000 -123,176,000 172,481,000 172,481,000 228,827,000 -19,589,000 55,460,000 55,460,000 -15,687,000 -14,586,000 53,522,000 53,522,000      -55,240,000 72,436,000    25,863,000 -25,268,000 57,569,000         8,181,000 -2,895,000    
          accrued expenses and other current liabilities
        -11,025,000 -93,133,000 -22,364,000 183,621,000 -16,690,000 631,000 -72,943,000 80,757,000 -37,385,000 121,554,000 65,130,000 43,792,000 -45,775,000 34,092,000 -75,317,000 48,605,000 -14,529,000 89,260,000 -142,974,000 33,406,000 57,446,000 -31,951,000 122,868,000 -19,421,000 224,179,000 -209,185,000                           75,084,000             57,385,000   12,548,000 
          contract liabilities
        32,085,000 3,742,000 -77,267,000 -92,689,000 -47,906,000 7,313,000 36,473,000 -5,192,000 -15,636,000 93,745,000 -34,408,000 45,857,000 -45,065,000 171,100,000 -59,000 55,042,000 -15,585,000 -46,832,000 -30,816,000 99,490,000 -62,023,000 97,348,000 46,100,000 -25,182,000 16,774,000 90,620,000  5,942,000 -44,801,000 76,471,000 76,471,000                                       
          other long-term liabilities
        41,390,000 -17,244,000 12,801,000 14,543,000 15,499,000 -37,929,000 45,913,000 -18,094,000 -25,431,000 -37,327,000 -47,668,000 -18,790,000 -45,367,000 28,046,000 -27,033,000 -34,182,000 -36,932,000 -74,150,000 6,318,000 -86,155,000 -37,501,000 -11,928,000 -3,312,000 6,281,000 27,975,000 6,135,000              -16,183,000                     -222,000 2,147,000        
          net cash from operating activities
        3,781,000 70,219,000 196,130,000 283,725,000 190,658,000 151,089,000 298,776,000 291,296,000 94,355,000 143,063,000 285,184,000 279,341,000 11,441,000 120,014,000 315,568,000 204,840,000 -1,627,000 194,855,000 318,082,000 320,334,000 59,150,000 7,104,000 649,352,000 186,231,000 -299,031,000 -206,930,000      71,844,000 118,395,000 52,428,000 52,428,000 413,937,000 -46,087,000 77,507,000 77,507,000 260,050,000   78,055,000  49,960,000 282,642,000 282,642,000 79,713,000 -31,391,000 137,387,000 96,117,000 85,245,000 67,089,000 201,965,000         93,597,000   88,743,000    
          capital expenditures
                             
          free cash flows
        3,781,000 70,219,000 196,130,000 283,725,000 190,658,000 151,089,000 298,776,000 291,296,000 94,355,000 143,063,000 285,184,000 279,341,000 11,441,000 120,014,000 315,568,000 204,840,000 -1,627,000 194,855,000 318,082,000 320,334,000 59,150,000 7,104,000 649,352,000 186,231,000 -299,031,000 -206,930,000      71,844,000 118,395,000 52,428,000 52,428,000 413,937,000 -46,087,000 77,507,000 77,507,000 260,050,000   78,055,000  49,960,000 282,642,000 282,642,000 79,713,000 -31,391,000 137,387,000 96,117,000 85,245,000 67,089,000 201,965,000         93,597,000   88,743,000    
          cash flows from investing activities:
                                                                             
          cash outflow from deconsolidation of a joint venture
                                                                           
          investment in unconsolidated joint ventures
        -24,187,000 -24,246,000 -25,179,000 -26,058,000 -3,404,000 -976,000 -6,706,000 -18,422,000 -16,133,000 -13,797,000 -14,928,000 -18,717,000 -13,929,000 -12,198,000 -6,467,000 -7,870,000 -6,308,000 -6,027,000 -5,536,000 -11,766,000 -4,006,000 -36,080,000 -21,794,000 -18,613,000 -29,567,000 -41,103,000                                            
          return of investment in unconsolidated joint ventures
        17,000,000 28,710,000 27,953,000 1,198,000 1,739,000 105,000     5,455,000 9,067,000 5,634,000 718,000 9,992,000 129,000 1,602,000 5,242,000 -12,000 72,000 2,808,000 11,005,000 12,033,000 1,493,000 3,516,000  2,582,000 4,729,000 9,273,000 9,273,000 2,258,000 5,412,000 5,030,000 5,030,000                                   
          other investing activities
        -2,000,000 -11,000,000 -10,960,000 2,375,000 -2,000,000 16,250,000 6,100,000                                                               
          proceeds from disposal of property and equipment
        11,000 31,000 56,000 38,000 104,000 94,000 151,000 94,000 180,000 69,000 56,000 32,000 171,000 85,000 8,314,000 58,000 33,000 546,000 4,538,000 164,000 491,000 9,629,000 1,290,000 917,000 1,037,000 556,000  2,878,000 3,698,000 1,674,000 1,674,000 9,625,000 2,532,000 10,967,000 10,967,000 857,000 2,764,000 2,557,000 2,557,000 5,424,000      4,663,000 4,663,000                       
          payments for capital expenditures
        -31,212,000 -28,318,000 -62,036,000 -22,042,000 -12,382,000 -40,215,000 -24,317,000 -18,546,000 -20,489,000 -56,245,000 -22,307,000 -14,474,000 -32,450,000 -36,369,000 -66,523,000 -22,005,000 -15,824,000 -32,665,000 -23,659,000 -25,338,000 -56,363,000 -30,902,000 -31,325,000 -37,110,000 -14,562,000 -31,594,000                                            
          net cash from investing activities
        -40,388,000 -34,823,000  -47,275,000 -61,295,000 -24,742,000  -63,974,000 -35,132,000 -86,789,000  -22,901,000 -38,314,000 -45,238,000  -27,668,000 -45,321,000 -48,571,000 -19,415,000 -39,180,000 -221,224,000 -141,268,000 -36,709,000 83,092,000 2,059,179,000 -68,125,000 445,006,000               39,987,000 39,987,000                    -14,664,000 -23,925,000 56,872,000     
          cash flows from financing activities:
                                                                             
          proceeds from borrowings under credit agreements
        3,443,116,000 873,484,000 281,422,000 463,985,000 802,702,000 664,815,000 849,703,000 2,759,531,000 1,468,960,000 1,091,072,000 1,006,598,000 955,319,000 809,450,000 735,301,000 989,614,000 1,293,229,000 894,729,000 441,013,000 790,672,000 1,596,478,000 842,056,000 409,710,000 248,522,000 109,044,000 2,284,003,000 1,810,509,000 1,127,497,000 1,892,288,000 2,213,763,000 2,290,452,000 2,290,452,000 1,725,814,000 4,436,915,000 1,276,451,000 1,276,451,000 1,515,554,000 1,488,327,000 1,634,781,000 1,634,781,000 1,123,468,000 1,100,072,000 1,222,663,000 1,222,663,000 868,967,000 906,880,000 3,858,648,000 3,858,648,000 357,904,000 536,227,000 504,397,000 494,292,000 762,884,000 590,547,000 301,088,000 395,694,000 380,354,000 519,272,000 377,695,000 582,009,000 -7,234,000 22,662,000 19,246,000 788,000 -6,788,000 7,073,000    3,868,000 
          repayments of borrowings under credit agreements
        -3,440,976,000 -884,626,000 -300,538,000 -472,486,000 -812,587,000 -673,769,000 -860,638,000 -2,427,506,000 -1,484,270,000 -1,106,061,000 -1,018,266,000 -969,553,000 -818,392,000 -746,428,000 -994,795,000 -1,299,501,000 -903,337,000 -459,675,000 -797,096,000 -699,395,000 -814,750,000 -415,106,000 -21,265,000 -229,808,000 -3,622,514,000 -1,694,733,000 -1,471,060,000                                           
          cash paid for debt issuance costs
        -5,216,000 -6,000 -3,202,000 -687,000          -996,000 -5,963,000                                                  
          dividends paid
        -40,361,000 -35,356,000 -34,423,000 -34,523,000 -35,485,000 -29,141,000 -29,853,000 -29,948,000 -30,968,000 -24,475,000 -24,944,000 -25,031,000 -25,421,000 -20,796,000 -20,935,000 -21,155,000                                                      
          proceeds from issuance of common stock
        7,457,000 11,394,000 17,639,000 5,438,000 11,314,000 5,693,000 8,927,000 10,789,000 5,162,000 9,678,000 10,922,000 9,481,000 3,874,000 8,620,000 6,077,000 8,555,000 3,668,000 8,366,000 6,339,000 7,816,000 3,432,000 8,099,000 9,157,000 3,688,000 8,800,000 4,743,000 6,031,000 9,827,000 9,057,000 5,485,000 5,485,000 11,730,000 6,040,000 9,530,000 9,530,000 10,376,000 4,466,000 9,875,000 9,875,000 9,194,000 6,873,000 6,894,000 6,894,000 4,841,000 5,068,000 3,645,000 3,645,000 1,856,000 6,134,000 1,803,000 4,136,000 5,825,000 1,840,000 4,630,000 2,172,000 4,634,000 4,663,000 2,004,000 6,081,000 -95,000 535,000 2,876,000 953,000 93,452,000 5,478,000  2,188,000 3,791,000  
          payments to repurchase common stock
        -116,002,000 -325,866,000 -250,056,000 -4,705,000 -78,464,000 -55,155,000 -315,354,000 -50,061,000 -20,948,000 -92,138,000 -234,075,000 -50,018,000 -25,181,000 -70,010,000 -55,072,000 -105,104,000 -50,486,000 -262,308,000 -117,244,000 -158,176,000 -122,814,000 -468,857,000 -136,474,000 -280,000 -11,689,000 -38,510,000 -15,517,000                                           
          net distributions to noncontrolling interests
        -19,340,000 -8,711,000 -20,067,000 -3,447,000 -257,000 -29,609,000   -129,000 -4,778,000   -2,709,000 -430,000 -5,980,000 -944,000 -4,475,000 -996,000 -1,772,000 -1,703,000 -1,450,000 -5,349,000 -22,123,000 -1,607,000 -2,129,000 -34,783,000                                            
          other financing activities
        -1,846,000 -4,545,000 2,859,000 584,000 -2,342,000 -3,477,000 3,059,000 104,000 47,000 422,000 -378,000 11,402,000 -1,717,000 2,363,000 -11,369,000 -2,304,000 1,526,000 -15,303,000 2,453,000 1,219,000 -17,136,000 2,035,000 -30,515,000 6,660,000 -29,056,000 32,126,000 -25,259,000 22,385,000                                          
          net cash from financing activities
        -173,168,000 -374,232,000 -122,067,000 -45,154,000 -115,119,000 -121,330,000 -339,834,000 232,800,000 -62,146,000 -126,280,000 -268,962,000 -56,609,000 -55,984,000 -91,380,000 -92,460,000 -127,224,000 -79,728,000 -288,903,000 -117,644,000 -174,476,000 -110,945,000 -469,468,000 -222,434,000 -112,303,000 -1,372,585,000 79,352,000 -243,810,000 -92,226,000 -74,598,000 213,234,000 213,234,000              -132,224,000 3,206,074,000 3,206,074,000        -40,009,000 72,698,000 -26,985,000 -40,138,000 334,147,000 742,000 19,173,000 17,595,000  -1,845,000 11,993,000 23,711,000 1,558,000 4,118,000  
          effect of exchange rate changes on cash
        -2,655,000 -216,000 -2,492,000 2,716,000 1,095,000 -5,153,000 2,473,000 -986,000 -1,272,000 1,104,000 -2,489,000 -547,000 1,035,000 2,513,000 -4,772,000 -5,209,000 2,464,000 -790,000 -1,098,000 1,926,000 -2,247,000 6,912,000 3,691,000 999,000 -8,598,000 2,714,000       3,223,000 2,882,000 2,882,000                   -1,872,000 4,012,000 5,895,000 3,566,000 5,967,000 3,821,000  -141,000 2,703,000    559,000   942,000 
          net increase in cash and cash equivalents
          -208,338,000 194,012,000   -63,329,000    -17,991,000        179,925,000 108,604,000   393,900,000 158,019,000         54,059,000 10,804,000 10,804,000 86,487,000 28,255,000 5,572,000 5,572,000      -122,051,000 160,460,000 160,460,000   81,066,000     -41,824,000 50,546,000       35,205,000 -1,891,000 48,570,000     
          cash and cash equivalents at beginning of period
        1,585,739,000  1,584,862,000  1,262,152,000  1,176,772,000  1,234,792,000  1,818,249,000  1,080,354,000  886,733,000 886,733,000 802,362,000 802,362,000 692,145,000 692,145,000 683,893,000 683,893,000 574,188,000 574,188,000 600,677,000 593,776,000 456,940,000 612,857,000 290,777,000 -1,400,000 194,522,000 -197,604,000 414,515,000 
          cash and cash equivalents at end of period
        -212,430,000 1,246,687,000  194,012,000 15,339,000 1,584,726,000  459,136,000 -4,195,000 1,193,250,000  199,284,000 -81,822,000 1,162,681,000  44,739,000 -124,212,000 1,091,383,000  108,604,000 -275,266,000 1,221,529,000  158,019,000 378,965,000 887,365,000  -33,311,000 -11,424,000 838,302,000 838,302,000 -65,806,000 54,059,000 813,166,000 813,166,000 86,487,000 28,255,000 697,717,000 697,717,000 -41,781,000 11,734,000 658,044,000 658,044,000 -6,697,000 -122,051,000 734,648,000 734,648,000 7,604,000 -179,200,000 681,743,000 -120,141,000 36,436,000 591,296,000 -67,268,000 -41,824,000 507,486,000 -21,917,000 -17,854,000 421,238,000 87,333,000 -46,400,000 252,949,000 33,805,000 -1,891,000 243,092,000 -44,567,000 -109,402,000 327,077,000 226,809,000 
          non-cash net fair value gains
         -5,091,000                                                                    
          net decrease in cash and cash equivalents
         -339,052,000    -136,000   -4,195,000 -68,902,000   -81,822,000 -14,091,000  44,739,000 -124,212,000 -143,409,000    -596,720,000    -192,989,000                                            
          less cash and cash equivalents included in current assets held for sale
             -4,070,000  -130,000 -2,259,000 -990,000  -15,068,000 -5,013,000 -2,331,000  913,000 6,889,000 -8,990,000  5,520,000 165,424,000 -176,781,000   30,660,000 -161,929,000                                            
          cash and cash equivalents of continuing operations at end of period
         1,246,687,000  194,012,000 19,409,000 1,580,656,000  459,006,000 -6,454,000 1,192,260,000  184,216,000 -86,835,000 1,160,350,000  45,652,000 -117,323,000 1,082,393,000  114,124,000 -109,842,000 1,044,748,000  196,207,000 409,625,000 725,436,000                                            
          equity in losses of unconsolidated joint ventures
          -1,306,000 -5,183,000 -819,000 -9,553,000 -3,959,000 -7,647,000 -16,059,000 28,941,000 -5,667,000                                                           
          impairment of long-lived assets
                           9,380,000 95,814,000                                                
          loss on sale of discontinued operations
              -12,673,000   3,062,000   -2,845,000 5,354,000   -3,690,000 6,105,000 38,783,000 11,334,000                                                
          prepayment premium on redemption of unsecured senior notes
                          235,000,000                                                  
          deferred income tax expense
                                                                             
          changes in operating assets and liabilities:
                                                                             
          payments for business acquisitions, net of cash acquired
                                                                             
          proceeds from sale of investments
              1,310,000 1,870,000 1,191,000 2,260,000 2,526,000 1,210,000 720,000 2,190,000 6,122,000 3,715,000 8,356,000 3,436,000 4,115,000 3,865,000 3,912,000 500,000  6,361,000 1,821,000 3,805,000 3,805,000                      2,470,000                 
          net cash from by investing activities
                                                                             
          issuance of unsecured senior notes
                                                   1,600,000,000 1,600,000,000                       
          redemption of unsecured senior notes
                                                                            
          proceeds from exercise of stock options
                  2,056,000                  6,000 479,000 2,715,000 2,715,000 1,612,000 2,067,000 2,067,000 3,775,000 1,862,000 3,013,000 3,013,000 3,499,000 2,091,000 2,383,000 2,383,000 3,132,000 4,308,000 1,637,000 1,678,000 5,980,000 2,851,000 246,000 1,336,000 2,320,000 703,000 2,288,000 2,902,000 5,819,000 2,743,000 1,191,000 5,367,000 1,278,000 7,433,000 5,916,000 2,794,000 2,185,000  
          cash and cash equivalents at beginning of year
                                                                             
          cash and cash equivalents at end of year
                                                                             
          less: cash and cash equivalents included in current assets held for sale
                              -16,836,000                                               
          cash and cash equivalents of continuing operations at end of year
                                                                             
          supplemental cash flow information:
                                                                             
          interest paid
                                                                             
          net income taxes paid
                                                                             
          payments for business acquisition, net of cash acquired
               -18,686,000                                                            
          payment for business acquisition, net of cash required
                                                                             
          payments for sale of discontinued operations, net of cash disposed
                                                                             
          net (distributions) contributions to noncontrolling interests
                                                                             
          payments for sale of discontinued operations, including cash disposed
                                                                             
          net contributions (distributions) to noncontrolling interests
                                                                             
          (payments for) proceeds from sale of discontinued operations, net of cash disposed
                                                                             
          prepayment premium on redemption of unsecured notes
                                                                             
          payments for sale of discontinued operations including cash disposed
                       1,429,000 -25,541,000 -18,149,000                                                    
          loss on disposal activities
                         42,095,000                      1,536,000 41,053,000 41,053,000                           
          impairment of long-lived assets, including goodwill
                                                                             
          (payment for) proceeds from sale of discontinued operations, net of cash disposed
                          -5,943,000                                                  
          proceeds from disposal of businesses, net of cash disposed
                                                                            
          payments for purchase of investments
                                                                             
          net income taxes (paid) refund received
                                                                             
          payment for disposal of discontinued operations including cash disposed
                             -90,159,000                                                
          gain on sale of discontinued operations
                              -14,888,000                                              
          write-off of debt issuance costs
                                                  8,997,000 8,997,000                       
          proceeds from sale of discontinued operations, net of cash disposed
                              122,000,000                                              
          proceeds from purchase price adjustment on business acquisition
                                                                             
          cash acquired from consolidation of joint venture
                                       7,630,000 7,630,000             18,955,000                    
          impairment of goodwill and intangibles
                                                                            
          other non-cash adjustments
                                                                             
          proceeds from disposal of business, net of cash disposed
                                  -25,712,000                                           
          pension settlement losses
                                                                             
          cash flows from operating activities
                                                                             
          net investment in unconsolidated joint ventures
                                                          574,000     363,000    797,000 423,000 4,768,000        
          net proceeds from sale of investment securities
                                                                             
          payments for capital expenditures, net of disposals
                                                                             
          net receipts from (investment in) intercompany notes
                                                                             
          other intercompany investing activities
                                                                             
          net borrowings (repayments) on intercompany notes
                                                                             
          other intercompany financing activities
                                                                             
          impairment of assets held for sale, including goodwill
                                                                            
          ​
                                                                             
          cash paid for debt and equity issuance costs
                                                                             
          gain on disposal activities
                                                                             
          accounts receivable
                                             47,064,000 47,064,000 180,803,000 6,198,000 29,119,000 29,119,000 -198,766,000 95,594,000 349,148,000 349,148,000  65,189,000 1,709,000 -10,688,000                   
          billings in excess of costs on uncompleted contracts
                                       -27,371,000 -24,069,000 93,102,000 93,102,000 94,275,000 -12,175,000 26,019,000 26,019,000   18,068,000 18,068,000   10,932,000 10,932,000 9,770,000 -18,777,000 21,241,000  -55,956,000 69,018,000 -24,099,000 3,950,000 57,260,000   9,562,000  -3,454,000 23,794,000 11,646,000 12,876,000 23,755,000 34,798,000 6,636,000 21,626,000 -29,777,000 
          proceeds (payments) related to business acquisitions
                                                                             
          proceeds from sales of investments
                                       2,577,000 161,000 161,000 100,000 300,000 300,000 300,000 250,000 200,000 11,201,000 11,201,000                           
          proceeds from issuance of unsecured senior notes
                                                                            
          proceeds related to business acquisitions
                                                                             
          proceeds from purchase price adjustment to business acquisition
                                        -3,000 2,206,000 2,206,000                                   
          income taxes payable
                                                                -1,426,000             
          excess tax benefit from share-based payments
                                                                             
          pension curtailment and settlement gains
                                                                             
          excess tax benefit from share-based payment
                                               500,000 11,000 3,324,000 3,324,000 1,072,000 34,000 2,526,000 2,526,000 62,000 116,000 448,000 534,000 535,000 685,000 27,000 419,000 687,000 156,000 985,000 60,051,000           
          prepaid expenses and other current and non-current assets
                                                                             
          proceeds from disposal of businesses
                                               2,132,000 37,567,000 37,567,000                           
          prepayment penalty on unsecured senior notes
                                                   55,639,000 55,639,000                       
          purchases of investments
                                                                             
          non-cash investing and financing activity
                                                                             
          common stock issued in acquisitions
                                                   1,554,912,000 1,554,912,000    14,322,000 857,000 9,586,000 58,868,000 1,300,000 33,500,000        
          debt assumed from acquisitions
                                                   567,656,000 567,656,000                       
          net loss
                                                 -403,000                            
          adjustments to reconcile net loss to net cash from operating activities:
                                                                             
          other noncash
                                                 2,892,000 2,892,000   2,060,000 2,060,000                       
          net cash provided by operating activities
                                                 78,055,000                            
          net cash (used in) provided by financing activities
                                                                             
          net (decrease) increase in cash and cash equivalents
                                                                             
          net (loss) income
                                                                             
          sale of investments
                                                                             
          net cash provided by (used) in financing activities
                                                                             
          net increase (decrease) in cash and cash equivalents
                                                                             
          net change in overdrafts
                                                                             
          sales (purchases) of investments
                                                       1,490,000       2,764,000 3,314,000              
          payments to repurchase common stock under the repurchase program
                                                                             
          payments for other repurchases of common stock
                                                                             
          (purchases) sales of investments
                                                                             
          adjustments to reconcile net income to net cash provided by operating activities:
                                                                             
          purchase of investments
                                                                             
          adjustments to reconcile net income to net cash used in operating activities:
                                                                             
          settlement of deferred compensation plan liability
                                                                             
          proceeds from disposal of business
                                                                  25,799,000        
          proceeds from sale of investments in rabbi trust
                                                               1,958,000              
          proceeds from loans on deferred compensation plan investments
                                                                             
          repayment of loans on deferred compensation plan investments
                                                                             
          net cash from operating activities from continuing operations
                                                                      94,739,000       
          net cash from operating activities from discontinued operations
                                                                      -1,142,000 4,940,000 3,116,000     
          proceeds from loan on deferred compensation plan investments
                                                                59,324,000           
          net (distributions to) contributions from noncontrolling interests
                                                                             
          purchases of investment securities/funds
                                                                             
          other non-cash expense
                                                                  749,000           
          excess tax benefit from share based payment
                                                                   7,933,000 8,012,000 768,000   4,633,000 6,426,000 3,642,000 4,910,000  
          sales of investment securities
                                                                      81,449,000     
          net contributions from (distributions to) noncontrolling interests
                                                                   -1,063,000          
          distribution of earnings from unconsolidated affiliates
                                                                      896,000 5,141,000 5,183,000   2,262,000  
          excess tax benefit from share based payments
                                                                      4,138,000       
          net investment in unconsolidated affiliates
                                                                      -1,230,000 -571,000 2,654,000     
          purchases of investment securities
                                                                             
          stock based compensation
                                                                         5,647,000 6,345,000 5,111,000  
          make-whole premium
                                                                             
          interest income on notes from stockholders
                                                                             
          gain on sale of equity investment
                                                                             
          income taxes receivable/payable
                                                                         6,204,000    
          proceeds from sales of investment securities
                                                                            
          proceeds from sale of equity investment
                                                                             
          proceeds from issuance of stock
                                                                             
          net proceeds from the issuance of common stock in initial public offering
                                                                             
          funding of stock purchase plan rabbi trust
                                                                             
          proceeds from payment of notes receivable from stockholders
                                                                             
          repayments of borrowings under long-term obligations
                                                                             
          non-cash investing and financing activity common stock issued in acquisitions
                                                                          16,871,000 3,979,000  
          net cash (used in) provided by operating activities
                                                                             
          stock match and other non-cash stock compensation
                                                                            6,505,000 
          write-off of deferred financing costs and make-whole premium
                                                                             
          other long-term obligations
                                                                             
          proceeds from the sale of equity investment
                                                                            
          net investments in unconsolidated joint ventures
                                                                             
          proceeds on sale of property and equipment
                                                                             
          proceeds from issuance of common stock and preferred stock
                                                                            12,404,000 
          proceeds from issuance of stock upon exercise of stock options
                                                                            1,169,000 
          net proceeds from the issuance of class f and class g preferred stock
                                                                             
          repurchase of class d preferred stock
                                                                             
          repayment of notes receivable from stockholders
                                                                            
          payments to repurchase common stock and common stock units
                                                                             
          payments of dividends on convertible preferred stock
                                                                             
          net cash provided by financing activities
                                                                            286,169,000 
          write-off of deferred financing costs
                                                                             
          net cash (used in)/provided by operating activities
                                                                             
          repayments of borrowings under other long-term obligations