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Joint Ventures and Variable Interest Entities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) item | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2013 USD ($)
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Number of employees in some joint ventures | item | 0 |  |  |  |  |  |  |  | 0 |  |  |
Current assets | $ 6,000,771 |  |  |  | $ 6,246,085 |  |  |  | $ 6,000,771 | $ 6,246,085 |  |
TOTAL ASSETS | 13,726,745 |  |  |  | 14,014,298 |  |  |  | 13,726,745 | 14,014,298 | $ 6,123,400 |
Current liabilities | 5,304,756 |  |  |  | 4,836,052 |  |  |  | 5,304,756 | 4,836,052 |  |
TOTAL LIABILITIES | 10,174,256 |  |  |  | 10,383,355 |  |  |  | 10,174,256 | 10,383,355 |  |
Total AECOM equity | 3,366,921 |  |  |  | 3,407,748 |  |  |  | 3,366,921 | 3,407,748 |  |
Noncontrolling interests | 185,568 |  |  |  | 223,195 |  |  |  | 185,568 | 223,195 |  |
TOTAL STOCKHOLDERS' EQUITY | 3,552,489 |  |  |  | 3,630,943 |  |  |  | 3,552,489 | 3,630,943 | 2,272,480 | $ 2,074,094
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 13,726,745 |  |  |  | 14,014,298 |  |  |  | 13,726,745 | 14,014,298 |  |
AECOM's investment in joint ventures | 330,485 |  |  |  | 321,625 |  |  |  | 330,485 | 321,625 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Revenue | 4,323,100 | $ 4,408,800 | $ 4,381,200 | $ 4,297,700 | 4,723,700 | $ 4,549,500 | $ 4,506,200 | $ 4,210,500 | 17,410,825 | 17,989,880 | 8,356,783 |
Cost of revenue | 4,175,900 | 4,237,500 | 4,197,800 | 4,156,800 | 4,553,100 | 4,422,900 | 4,403,000 | 4,075,700 | 16,768,001 | 17,454,692 | 7,953,607 |
Gross profit | 147,200 | 171,300 | 183,400 | 140,900 | 170,600 | 126,600 | 103,200 | 134,800 | 642,824 | 535,188 | 403,176 |
Net income | 12,900 | 84,400 | 66,600 | (400) | 26,500 | (200) | 20,600 | (118,100) | 163,472 | (71,233) | 232,764 |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Total | $ 21,200 | $ 18,500 | $ 39,100 | $ 25,200 | 29,900 | $ 27,700 | $ 24,700 | $ 23,900 | $ 104,032 | 106,245 | 57,924 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Number of partners required to form joint ventures | item | 2 |  |  |  |  |  |  |  | 2 |  |  |
Consolidated Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 684,100 |  |  |  | 727,800 |  |  |  | $ 684,100 | 727,800 |  |
Non-current assets | 230,800 |  |  |  | 282,800 |  |  |  | 230,800 | 282,800 |  |
TOTAL ASSETS | 914,900 |  |  |  | 1,010,600 |  |  |  | 914,900 | 1,010,600 |  |
Current liabilities | 407,400 |  |  |  | 441,500 |  |  |  | 407,400 | 441,500 |  |
Non-current liabilities | 12,400 |  |  |  | 200 |  |  |  | 12,400 | 200 |  |
TOTAL LIABILITIES | 419,800 |  |  |  | 441,700 |  |  |  | 419,800 | 441,700 |  |
Total AECOM equity | 318,000 |  |  |  | 354,700 |  |  |  | 318,000 | 354,700 |  |
Noncontrolling interests | 177,100 |  |  |  | 214,200 |  |  |  | 177,100 | 214,200 |  |
TOTAL STOCKHOLDERS' EQUITY | 495,100 |  |  |  | 568,900 |  |  |  | 495,100 | 568,900 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 914,900 |  |  |  | 1,010,600 |  |  |  | 914,900 | 1,010,600 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,935,200 | 2,368,000 | 614,500 |
Unconsolidated Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
Current assets | 1,407,000 |  |  |  | 1,200,700 |  |  |  | 1,407,000 | 1,200,700 |  |
Non-current assets | 499,400 |  |  |  | 527,300 |  |  |  | 499,400 | 527,300 |  |
TOTAL ASSETS | 1,906,400 |  |  |  | 1,728,000 |  |  |  | 1,906,400 | 1,728,000 |  |
Current liabilities | 977,300 |  |  |  | 936,700 |  |  |  | 977,300 | 936,700 |  |
Non-current liabilities | 146,200 |  |  |  | 87,000 |  |  |  | 146,200 | 87,000 |  |
TOTAL LIABILITIES | 1,123,500 |  |  |  | 1,023,700 |  |  |  | 1,123,500 | 1,023,700 |  |
TOTAL STOCKHOLDERS' EQUITY | 782,900 |  |  |  | 704,300 |  |  |  | 782,900 | 704,300 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 1,906,400 |  |  |  | 1,728,000 |  |  |  | 1,906,400 | 1,728,000 |  |
AECOM's investment in joint ventures | $ 330,500 |  |  |  | $ 321,600 |  |  |  | 330,500 | 321,600 |  |
Joint ventures summarized financial information |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 4,871,800 | 4,754,600 |  |
Cost of revenue |  |  |  |  |  |  |  |  | 4,618,300 | 4,476,800 |  |
Gross profit |  |  |  |  |  |  |  |  | 253,500 | 277,800 |  |
Net income |  |  |  |  |  |  |  |  | 233,900 | 231,200 |  |
Summary of AECOM's equity in earnings of unconsolidated joint ventures: |  |  |  |  |  |  |  |  |  |  |  |
Pass-through joint ventures |  |  |  |  |  |  |  |  | 21,900 | 26,200 | 10,200 |
Other joint ventures |  |  |  |  |  |  |  |  | 82,100 | 80,000 | 47,700 |
Total |  |  |  |  |  |  |  |  | $ 104,000 | $ 106,200 | 57,900 |
Consolidated joint venture during the year ended 09/30/2014 |  |  |  |  |  |  |  |  |  |  |  |
Financial information |  |  |  |  |  |  |  |  |  |  |  |
TOTAL ASSETS |  |  |  |  |  |  |  |  |  |  | 207,800 |
TOTAL LIABILITIES |  |  |  |  |  |  |  |  |  |  | 48,100 |
Equity in earnings of unconsolidated joint ventures |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from equity in earnings of joint ventures due to the change in control |  |  |  |  |  |  |  |  |  |  | 37,400 |
Gain (loss) from equity in earnings of joint ventures due to the change in control, net of tax |  |  |  |  |  |  |  |  |  |  | 23,400 |
Fair value of the previously held equity interest, excluding control premium |  |  |  |  |  |  |  |  |  |  | $ 58,000 |

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