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Business Acquisitions, Goodwill and Intangible Assets (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Oct. 24, 2014 | Oct. 17, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Pro Forma Operating Results |  |  |  |  |  |
Total |  |  | $ 88,495 | $ 7,837 | $ 318,557 | $ 7,837
Write-off of debt issuance costs |  |  |  |  | 8,997 |
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 |  | 284,800 |  |  |  |
Accounts receivable |  | 2,549,900 |  |  |  |
Prepaid expenses and other current assets |  | 398,900 |  |  |  |
Property and equipment |  | 581,600 |  |  |  |
Total identifiable intangible assets |  | 968,800 |  |  |  |
Goodwill |  | 3,959,900 |  |  |  |
Other non-current assets |  | 330,300 |  |  |  |
Accounts payable |  | (650,000) |  |  |  |
Accrued expenses and other current liabilities |  | (1,301,700) |  |  |  |
Billings in excess of cost on uncompleted contracts |  | (363,700) | (75,300) |  | (75,300) |
Current portion of long-term debt |  | (47,400) |  |  |  |
Other long-term liabilities |  | (439,800) |  |  |  |
Pension benefit obligations |  | (406,300) |  |  |  |
Long-term debt |  | (520,200) |  |  |  |
Noncontrolling interests |  | (224,500) |  |  |  |
Net assets acquired |  | 5,120,600 |  |  |  |
Accrued expenses and other current liabilities |  | 220,000 |  |  |  |
Fair value of margin liability |  | 135,600 |  |  |  |
Pro Forma Operating Results |  |  |  |  |  |
Revenue |  |  |  |  | 13,587,000 | 13,612,000
Income from continuing operations |  |  |  |  | 323,000 | 93,000
Net income (loss) |  |  |  |  | 213,000 | (36,000)
Net income (loss) attributable to AECOM |  |  |  |  | 143,000 | (76,000)
Revenue of acquiree since acquisition date |  |  |  |  | 6,400,000 |
Income from continuing operations of acquiree since acquisition date |  |  |  |  | 102,100 |
Amortization of intangible assets of acquiree since acquisition date |  |  | 76,700 |  | 269,000 |
Fair value adjustment of joint ventures |  |  | 9,700 |  | 27,600 |
Fair value adjustment of noncontrolling interests |  |  | (5,700) |  | (20,800) |
Severance and personnel costs |  |  | 35,100 |  | 186,600 |
Professional service, real estate-related, and other expenses |  |  | 53,400 |  | 132,000 |
Personnel costs |  |  |  |  |  | 2,500
Professional service and other expenses |  |  |  |  |  | 5,300
Total |  |  | 88,500 |  | 318,600 | $ 7,800
Severance expense |  |  |  |  | 86,000 |
Severance expense paid |  |  |  |  | 53,000 |
Financing-related expenses |  |  | $ 4,000 |  | 76,000 |
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 |  |  |  |  | $ 0.94 | $ (0.50)
Diluted |  |  |  |  | $ 0.94 | $ (0.50)
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 |  | $ 961,000 |  |  |  |
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 | $ 600,000 |  |  |  |

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- Definition The pro forma diluted net income per share for a 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 The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, 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 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 The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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 This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: 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 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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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting 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)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities incurred for goods and services received that are used in an entity's business and related party payables, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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