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Business Acquisitions, Goodwill and Intangible Assets - Acquisitions (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 24, 2014 | Oct. 17, 2014 USD ($) | Sep. 30, 2016 USD ($) | 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 ($) item $ / shares | Sep. 30, 2014 USD ($) item $ / shares
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  |  | $ 71,200 | $ 50,700 | $ 50,700 | $ 41,000 | $ 79,800 | $ 88,500 | $ 91,600 | $ 138,500 | $ 213,642 | $ 398,440 | $ 27,310
Write-off of debt issuance costs |  |  |  |  |  |  |  |  |  |  | $ 7,749 | $ 8,997 |
Number of business acquisitions | item |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 2
Loss on disposal activities |  |  |  |  | $ (1,600) | $ (41,000) |  |  |  |  | $ (42,589) |  |
Trademark / tradename | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  | 3 months 18 days |  |
Trademark / tradename | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  |  |  |  |  | 2 years |  |
URS Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Consideration paid in cash |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Consideration paid by issuing stock |  | 1,600,000 |  |  |  |  |  |  |  |  |  |  |
Senior notes assumed in acquisition as part of consideration |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Repayment of acquiree term loan as part of consideration |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Repayment of acquiree line of credit as part of consideration |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 284,900 |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  | 2,512,800 |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  | 421,000 |  |  |  |  |  |  |  |  |  |  |
Property and equipment |  | 570,900 |  |  |  |  |  |  |  |  |  |  |
Total identifiable intangible assets |  | 981,600 |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 4,059,800 |  |  |  |  |  |  |  |  |  |  |
Other non-current assets |  | 329,800 |  |  |  |  |  |  |  |  |  |  |
Accounts payable |  | (656,700) |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  | (1,403,700) |  |  |  |  |  |  |  |  |  |  |
Billings in excess of cost on uncompleted contracts |  | (398,800) | 14,900 |  |  |  |  |  |  |  | $ 14,900 |  |
Current portion of long-term debt |  | (47,400) |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | (406,100) |  |  |  |  |  |  |  |  |  |  |
Pension benefit obligations |  | (406,300) |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  | (520,200) |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  | (201,000) |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  | 5,120,600 |  |  |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  | 240,000 |  |  |  |  |  |  |  |  |  |  |
Pro Forma Operating Results |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 18,288 | $ 18,776
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  | 509 | (144)
Net income |  |  |  |  |  |  |  |  |  |  |  | 325 | 1
Net income (loss) attributable to AECOM |  |  |  |  |  |  |  |  |  |  |  | $ 229 | $ (65)
Net income (loss) attributable to AECOM per share: |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.51 | $ (0.43)
Diluted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.50 | $ (0.43)
Amortization of intangible assets of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  | 183,300 | $ 361,600 |
Fair value adjustment of joint ventures |  |  |  |  |  |  |  |  |  |  | 23,000 | 37,300 |
Fair value adjustment of noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ (13,800) | (26,600) |
Fair value of margin liability |  | 149,100 |  |  |  |  |  |  |  |  |  |  |
Years the remaining liability will be recognized |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Years the majority liability will be recognized |  |  |  |  |  |  |  |  |  |  | 2 years |  |
Revenue and related income from operations |  |  |  |  |  |  |  |  |  |  | $ 37,200 | 96,900 |
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Severance and personnel costs |  |  |  |  |  |  |  |  |  |  | 23,400 | 223,800 |
Professional service, real estate-related, and other expenses |  |  |  |  |  |  |  |  |  |  | 190,200 | 174,600 |
Total |  |  |  |  |  |  |  |  |  |  | 213,600 | 398,400 |
Severance expense |  |  |  |  |  |  |  |  |  |  | 21,800 | 101,900 |
Severance expense paid |  |  |  |  |  |  |  |  |  |  | 19,300 | 83,600 |
Penalty from prepayment of unsecured senior notes |  |  |  |  |  |  |  |  |  |  |  | 55,600 |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  | 9,000 |
URS Corporation | Non-core |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on disposal activities |  |  |  |  |  |  |  |  |  |  | (42,600) |  |
Net assets related to the loss on disposal activities |  |  | $ 112,800 |  |  |  |  |  |  |  | 112,800 |  |
Losses incurred |  |  |  |  |  |  |  |  |  |  | 36,900 |  |
URS Corporation | Customer relationships, contracts and backlog |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable intangible assets |  | $ 973,800 |  |  |  |  |  |  |  |  |  |  |
URS Corporation | Customer relationships, contracts and backlog | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 1 year |  |  |  |  |  |  |  |  |  |  |
URS Corporation | Customer relationships, contracts and backlog | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 11 years |  |  |  |  |  |  |  |  |  |  |
URS Corporation | Customer relationships, contracts and backlog | Weighted Average |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  | 3 years |  |  |  |  |  |  |  |  |  |  |
URS Corporation | Trade Name |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable intangible assets |  | $ 7,800 |  |  |  |  |  |  |  |  |  |  |
URS Corporation | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage price of original principal amount of note at which note can be redeemed | 101.00% | 101.00% |  |  |  |  |  |  |  |  |  |  |
Acquisitions excluding URS Corporation |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid in cash |  |  |  |  |  |  |  |  |  |  |  | 4,800 | $ 70,200
Senior notes assumed in acquisition as part of consideration |  |  |  |  |  |  |  |  |  |  |  | 22,500 | 18,300
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  | 600 |  |  |  |  | 600 | 17,100
Other current assets |  |  |  |  |  |  | 13,800 |  |  |  |  | 13,800 | 256,200
Total identifiable intangible assets |  |  |  |  |  |  | 1,300 |  |  |  |  | 1,300 | 11,900
Goodwill |  |  |  |  |  |  | 23,600 |  |  |  |  | 23,600 | 72,700
Other non-current assets |  |  |  |  |  |  |  |  |  |  |  |  | 16,500
Current liabilities |  |  |  |  |  |  | (12,000) |  |  |  |  | (12,000) | (274,100)
Noncurrent liabilities |  |  |  |  |  |  |  |  |  |  |  |  | (11,800)
Net assets acquired |  |  |  |  |  |  | 27,300 |  |  |  |  | 27,300 | 88,500
Acquisition and integration expenses |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate value of all consideration for acquisitions consummated |  |  |  |  |  |  |  |  |  |  | $ 5,500 | 27,300 | 88,500
Acquisitions excluding URS Corporation | Customer relationships, contracts and backlog |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable intangible assets |  |  |  |  |  |  | $ 1,300 |  |  |  |  | $ 1,300 | 10,400
Acquisitions excluding URS Corporation | Trademark / tradename |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Total identifiable intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500

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