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Condensed Consolidating Financial Information - Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Total cash and cash equivalents | $ 813,166 | $ 802,362 | $ 697,717 | $ 692,145
Accounts receivable-net | 5,313,672 | 5,127,743 |  |
Prepaid expenses and other current assets | 676,951 | 696,718 |  |
Income taxes receivable | 38,251 | 55,399 |  |
TOTAL CURRENT ASSETS | 6,842,040 | 6,682,222 |  |
PROPERTY AND EQUIPMENT-NET | 631,601 | 621,357 |  |
DEFERRED TAX ASSETS-NET | 216,742 | 171,331 |  |
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES | 370,294 | 364,223 |  |
GOODWILL | 5,997,000 | 5,992,881 |  |
INTANGIBLE ASSETS-NET | 411,759 | 415,096 |  |
OTHER NON-CURRENT ASSETS | 153,515 | 149,846 |  |
TOTAL ASSETS | 14,622,951 | 14,396,956 |  |
CURRENT LIABILITIES: |  |  |  |
Short-term debt | 2,361 | 1,221 |  |
Accounts payable | 2,426,469 | 2,249,872 |  |
Accrued expenses and other current liabilities | 2,072,155 | 2,245,519 |  |
Income taxes payable | 18,244 | 38,176 |  |
Billings in excess of costs on uncompleted contracts | 995,914 | 902,812 |  |
Current portion of long-term debt | 160,914 | 140,779 |  |
TOTAL CURRENT LIABILITIES | 5,676,057 | 5,578,379 |  |
OTHER LONG-TERM LIABILITIES | 844,900 | 881,300 |  |
DEFERRED TAX LIABILITY-NET | 32,327 | 20,515 |  |
LONG-TERM DEBT | 3,738,901 | 3,702,109 |  |
TOTAL LIABILITIES | 10,292,170 | 10,182,270 |  |
TOTAL AECOM STOCKHOLDERS' EQUITY | 4,104,369 | 3,996,126 |  |
Noncontrolling interests | 226,412 | 218,560 |  |
TOTAL STOCKHOLDERS' EQUITY | 4,330,781 | 4,214,686 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 14,622,951 | 14,396,956 |  |
Reportable Legal Entities | Parent |  |  |  |
CURRENT ASSETS: |  |  |  |
Total cash and cash equivalents | 4,100 | 32,600 | 22,000 | 1,800
Intercompany receivable | 733,600 | 723,600 |  |
Prepaid expenses and other current assets | 91,200 | 67,500 |  |
Income taxes receivable | 11,000 | 4,300 |  |
TOTAL CURRENT ASSETS | 839,900 | 828,000 |  |
PROPERTY AND EQUIPMENT-NET | 165,900 | 160,200 |  |
DEFERRED TAX ASSETS-NET | 154,800 | 239,700 |  |
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES | 6,775,500 | 6,606,200 |  |
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES | 8,600 | 7,200 |  |
OTHER NON-CURRENT ASSETS | 8,700 | 8,700 |  |
TOTAL ASSETS | 7,953,400 | 7,850,000 |  |
CURRENT LIABILITIES: |  |  |  |
Short-term debt | 2,400 | 1,100 |  |
Accounts payable | 42,500 | 33,800 |  |
Accrued expenses and other current liabilities | 76,500 | 92,200 |  |
Intercompany payable | 93,800 | 149,200 |  |
Billings in excess of costs on uncompleted contracts | 2,900 | 3,400 |  |
Current portion of long-term debt | 110,700 | 110,900 |  |
TOTAL CURRENT LIABILITIES | 328,800 | 390,600 |  |
OTHER LONG-TERM LIABILITIES | 103,500 | 102,300 |  |
NOTE PAYABLE INTERCOMPANY-NON CURRENT | 100 | 100 |  |
LONG-TERM DEBT | 3,422,000 | 3,366,900 |  |
TOTAL LIABILITIES | 3,854,400 | 3,859,900 |  |
TOTAL AECOM STOCKHOLDERS' EQUITY | 4,099,000 | 3,990,100 |  |
TOTAL STOCKHOLDERS' EQUITY | 4,099,000 | 3,990,100 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 7,953,400 | 7,850,000 |  |
Reportable Legal Entities | Guarantor Subsidiaries |  |  |  |
CURRENT ASSETS: |  |  |  |
Total cash and cash equivalents | 213,200 | 251,600 | 159,500 | 183,700
Accounts receivable-net | 2,283,700 | 2,159,200 |  |
Intercompany receivable | 91,000 | 90,900 |  |
Prepaid expenses and other current assets | 305,900 | 338,400 |  |
TOTAL CURRENT ASSETS | 2,893,800 | 2,840,100 |  |
PROPERTY AND EQUIPMENT-NET | 220,400 | 207,100 |  |
DEFERRED TAX ASSETS-NET | 111,400 | 55,200 |  |
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES | 2,756,700 | 2,865,000 |  |
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES | 52,400 | 50,300 |  |
GOODWILL | 3,318,600 | 3,318,600 |  |
INTANGIBLE ASSETS-NET | 257,400 | 271,600 |  |
OTHER NON-CURRENT ASSETS | 21,200 | 17,600 |  |
TOTAL ASSETS | 9,631,900 | 9,625,500 |  |
CURRENT LIABILITIES: |  |  |  |
Accounts payable | 1,098,200 | 1,023,700 |  |
Accrued expenses and other current liabilities | 955,800 | 1,112,900 |  |
Intercompany payable | 761,700 | 787,500 |  |
Billings in excess of costs on uncompleted contracts | 355,200 | 313,100 |  |
Current portion of long-term debt | 27,700 | 14,900 |  |
TOTAL CURRENT LIABILITIES | 3,198,600 | 3,252,100 |  |
OTHER LONG-TERM LIABILITIES | 264,000 | 285,700 |  |
LONG-TERM DEBT | 276,900 | 281,600 |  |
TOTAL LIABILITIES | 3,739,500 | 3,819,400 |  |
TOTAL AECOM STOCKHOLDERS' EQUITY | 5,892,400 | 5,806,100 |  |
TOTAL STOCKHOLDERS' EQUITY | 5,892,400 | 5,806,100 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 9,631,900 | 9,625,500 |  |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |
CURRENT ASSETS: |  |  |  |
Total cash and cash equivalents | 595,900 | 518,200 | $ 516,200 | $ 506,600
Accounts receivable-net | 3,030,000 | 2,968,500 |  |
Intercompany receivable | 128,000 | 181,400 |  |
Prepaid expenses and other current assets | 279,800 | 290,800 |  |
Income taxes receivable | 27,200 | 51,100 |  |
TOTAL CURRENT ASSETS | 4,060,900 | 4,010,000 |  |
PROPERTY AND EQUIPMENT-NET | 245,300 | 254,100 |  |
DEFERRED TAX ASSETS-NET | 251,600 | 171,000 |  |
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES | 309,300 | 306,700 |  |
GOODWILL | 2,678,400 | 2,674,300 |  |
INTANGIBLE ASSETS-NET | 154,400 | 143,500 |  |
OTHER NON-CURRENT ASSETS | 123,600 | 123,600 |  |
TOTAL ASSETS | 7,823,500 | 7,683,200 |  |
CURRENT LIABILITIES: |  |  |  |
Short-term debt |  | 100 |  |
Accounts payable | 1,285,800 | 1,192,400 |  |
Accrued expenses and other current liabilities | 1,039,900 | 1,040,400 |  |
Income taxes payable | 18,200 | 38,200 |  |
Intercompany payable | 170,000 | 161,400 |  |
Billings in excess of costs on uncompleted contracts | 637,800 | 586,300 |  |
Current portion of long-term debt | 22,500 | 15,000 |  |
TOTAL CURRENT LIABILITIES | 3,174,200 | 3,033,800 |  |
OTHER LONG-TERM LIABILITIES | 477,400 | 493,300 |  |
DEFERRED TAX LIABILITY-NET | 333,300 | 315,100 |  |
NOTE PAYABLE INTERCOMPANY-NON CURRENT | 472,200 | 467,200 |  |
LONG-TERM DEBT | 40,000 | 53,600 |  |
TOTAL LIABILITIES | 4,497,100 | 4,363,000 |  |
TOTAL AECOM STOCKHOLDERS' EQUITY | 3,100,000 | 3,101,600 |  |
Noncontrolling interests | 226,400 | 218,600 |  |
TOTAL STOCKHOLDERS' EQUITY | 3,326,400 | 3,320,200 |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | 7,823,500 | 7,683,200 |  |
Eliminations |  |  |  |
CURRENT ASSETS: |  |  |  |
Intercompany receivable | (952,600) | (995,900) |  |
TOTAL CURRENT ASSETS | (952,600) | (995,900) |  |
DEFERRED TAX ASSETS-NET | (301,000) | (294,600) |  |
INVESTMENTS IN CONSOLIDATED SUBSIDIARIES | (9,532,200) | (9,471,200) |  |
TOTAL ASSETS | (10,785,800) | (10,761,700) |  |
CURRENT LIABILITIES: |  |  |  |
Intercompany payable | (1,025,500) | (1,098,100) |  |
TOTAL CURRENT LIABILITIES | (1,025,500) | (1,098,100) |  |
DEFERRED TAX LIABILITY-NET | (301,000) | (294,600) |  |
NOTE PAYABLE INTERCOMPANY-NON CURRENT | (472,300) | (467,300) |  |
TOTAL LIABILITIES | (1,798,800) | (1,860,000) |  |
TOTAL AECOM STOCKHOLDERS' EQUITY | (8,987,000) | (8,901,700) |  |
TOTAL STOCKHOLDERS' EQUITY | (8,987,000) | (8,901,700) |  |
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY | $ (10,785,800) | $ (10,761,700) |  |

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