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Business Acquisitions, Goodwill and Intangible Assets (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 24, 2014 USD ($) | Oct. 17, 2014 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) item $ / shares | Sep. 30, 2014 USD ($) item $ / shares | Sep. 30, 2013 USD ($) item
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of business acquisitions | item |  |  |  |  |  |  |  |  | 1 | 2 | 2
Pro Forma Operating Results |  |  |  |  |  |  |  |  |  |  |
Total |  |  | $ 79,800 | $ 88,500 | $ 91,600 | $ 138,500 | $ 19,500 | $ 7,800 | $ (398,440) | $ (27,310) |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  | $ 8,997 |  |
Maximum period to determine final value of identifiable intangible assets |  |  |  |  |  |  |  |  | 12 months |  |
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 [Line Items] |  |  |  |  |  |  |  |  |  |  |
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 |  | 977,000 |  |  |  |  |  |  |  |  |
Goodwill |  | 4,021,700 |  |  |  |  |  |  |  |  |
Other non-current assets |  | 329,800 |  |  |  |  |  |  |  |  |
Accounts payable |  | (656,700) |  |  |  |  |  |  |  |  |
Accrued expenses and other current liabilities |  | (1,344,800) |  |  |  |  |  |  |  |  |
Billings in excess of cost on uncompleted contracts |  | (397,800) | 51,200 |  |  |  |  |  | $ 51,200 |  |
Current portion of long-term debt |  | (47,400) |  |  |  |  |  |  |  |  |
Other long-term liabilities |  | (423,300) |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Fair value of margin liability |  | 148,100 |  |  |  |  |  |  |  |  |
Years the remaining liability will be recognized |  |  |  |  |  |  |  |  | 5 years |  |
Revenue and related income from operations |  |  |  |  |  |  |  |  | $ 96,900 |  |
Pro Forma Operating Results |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 18,288 | 18,776 |
Income from continuing operations |  |  |  |  |  |  |  |  | 509 | (144) |
Net income (loss) |  |  |  |  |  |  |  |  | 325 | 1 |
Net income (loss) attributable to AECOM |  |  |  |  |  |  |  |  | 229 | (65) |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  | 8,500,000 |  |
Income from continuing operations of acquiree since acquisition date |  |  |  |  |  |  |  |  | 219,000 |  |
Amortization of intangible assets of acquiree since acquisition date |  |  |  |  |  |  |  |  | 361,600 |  |
Fair value adjustment of joint ventures |  |  |  |  |  |  |  |  | 37,300 |  |
Fair value adjustment of noncontrolling interests |  |  |  |  |  |  |  |  | (26,600) |  |
Severance and personnel costs |  |  |  |  |  |  |  |  | 223,800 | 15,200 |
Professional service, real estate-related, and other expenses |  |  |  |  |  |  |  |  | 174,600 | 12,100 |
Total |  |  |  |  |  |  |  |  | 398,400 | $ 27,300 |
Severance expense |  |  |  |  |  |  |  |  | 101,900 |  |
Severance expense paid |  |  |  |  |  |  |  |  | 83,600 |  |
Financing-related expenses |  |  |  |  |  |  |  |  | 79,800 |  |
Penalty from prepayment of unsecured senior notes |  |  |  |  |  |  |  |  | 55,600 |  |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  | $ 9,000 |  |
Net income (loss) attributable to AECOM per share: |  |  |  |  |  |  |  |  |  |  |
Basic | $ / shares |  |  |  |  |  |  |  |  | $ 1.51 | $ (0.43) |
Diluted | $ / shares |  |  |  |  |  |  |  |  | $ 1.50 | $ (0.43) |
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 |  | $ 969,200 |  |  |  |  |  |  |  |  |
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 [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage price of original principal amount of note at which note can be redeemed | 101.00% | 101.00% |  |  |  |  |  |  |  |  |
Amount of notes purchased | $ 572,300 |  |  |  |  |  |  |  |  |  |
Acquisitions excluding URS Corporation |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration paid in cash |  |  |  |  |  |  |  |  | $ 4,800 | $ 70,200 | $ 62,100
Consideration paid by issuing stock |  |  |  |  |  |  |  |  |  |  | 14,300
Senior notes assumed in acquisition as part of consideration |  |  |  |  |  |  |  |  | 22,500 | 18,300 | 5,600
Aggregate value of all consideration for acquisitions consummated |  |  |  |  |  |  |  |  | 27,300 | 88,500 | 82,000
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 600 |  |  |  | 17,100 |  | 600 | 17,100 | 20,100
Other current assets |  |  | 13,800 |  |  |  | 256,200 |  | 13,800 | 256,200 | 41,500
Total identifiable intangible assets |  |  | 1,300 |  |  |  | 11,900 |  | 1,300 | 11,900 | 9,400
Goodwill |  |  | 23,600 |  |  |  | 72,700 |  | 23,600 | 72,700 | 72,600
Other non-current assets |  |  |  |  |  |  | 16,500 |  |  | 16,500 | 8,600
Net assets acquired |  |  | 27,300 |  |  |  | 88,500 |  | 27,300 | 88,500 | 82,000
Current liabilities |  |  | (12,000) |  |  |  | (274,100) |  | (12,000) | (274,100) | (54,900)
Noncurrent liabilities |  |  |  |  |  |  | (11,800) |  |  | (11,800) | (15,300)
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 |  |  |  | 10,400 |  | $ 1,300 | 10,400 | $ 9,400
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 |  |  | $ 1,500 |

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- Definition This element represents the amount of amortization of intangible assets of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References No definition available. + Details
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- Definition Maximum period from the date of acquisition to determine the final value of the identifiable intangible assets in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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