AECOM (ACM) 10-Q 11 Feb 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Dec. 31, 2014	Jan. 30, 2015
Document and Entity Information
Entity Registrant Name	AECOM
Entity Central Index Key	868857
Document Type	10-Q
Document Period End Date	31-Dec-14
Amendment Flag	FALSE
Current Fiscal Year End Date	-21
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		155,475,574
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified
CURRENT ASSETS:
Cash and cash equivalents	$583,884	$521,784
Cash in consolidated joint ventures	150,764	52,404
Total cash and cash equivalents	734,648	574,188
Accounts receivable-net	4,873,911	2,654,976
Prepaid expenses and other current assets	371,358	177,536
Income taxes receivable	22,571	1,541
Deferred tax assets-net	98,297	25,872
TOTAL CURRENT ASSETS	6,100,785	3,434,113
PROPERTY AND EQUIPMENT-NET	862,640	281,979
DEFERRED TAX ASSETS-NET	72,035	118,038
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	348,671	142,901
GOODWILL	5,671,767	1,937,338
INTANGIBLE ASSETS-NET	858,860	90,238
OTHER NON-CURRENT ASSETS	338,511	118,770
TOTAL ASSETS	14,253,269	6,123,377
CURRENT LIABILITIES:
Short-term debt	49,625	23,915
Accounts payable	1,741,934	1,047,155
Accrued expenses and other current liabilities	1,854,293	964,627
Billings in excess of costs on uncompleted contracts	587,129	379,574
Deferred tax liability - net	27,293
Current portion of long-term debt	152,803	40,498
TOTAL CURRENT LIABILITIES	4,413,077	2,455,769
OTHER LONG-TERM LIABILITIES	332,473	233,977
DEFERRED TAX LIABILITY - NET	293,228	844
PENSION AND POST-RETIREMENT BENEFIT OBLIGATIONS	599,783	220,742
LONG-TERM DEBT	4,775,396	939,565
TOTAL LIABILITIES	10,413,957	3,850,897
COMMITMENTS AND CONTINGENCIES (Note 16)
AECOM STOCKHOLDERS' EQUITY:
Common stock-authorized, 300,000,000 shares of $0.01 par value as of December 31 and September 30, 2014; issued and outstanding 149,727,935 and 96,715,797 shares as of December 31 and September 30, 2014, respectively	1,497	967
Additional paid-in capital	3,450,736	1,864,971
Accumulated other comprehensive loss	-475,691	-356,602
Retained earnings	573,678	677,181
TOTAL AECOM STOCKHOLDERS' EQUITY	3,550,220	2,186,517
Noncontrolling interests	289,092	85,963
TOTAL STOCKHOLDERS' EQUITY	3,839,312	2,272,480
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$14,253,269	$6,123,377

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Sep. 30, 2014
Statement of Financial Position [Abstract]
Common stock, authorized shares	300,000,000	300,000,000
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, issued shares	149,727,935	96,715,797
Common stock, outstanding shares	149,727,935	96,715,797

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$4,186,035	$1,953,875
Cost of revenue.	4,021,812	1,875,677
Gross profit	164,223	78,198
Equity in earnings of joint ventures	23,924	36,083
General and administrative expenses	-34,338	-23,845
Acquisition and integration expense	-138,463
Income from operations	15,346	90,436
Other income	2,579	17
Interest expense	-118,698	-10,427
(Loss) income before income tax expense	-100,773	80,026
Income tax (benefit) expense	-20,443	23,485
Net (loss) income	-80,330	56,541
Noncontrolling interests in income of consolidated subsidiaries, net of tax	-23,173	-145
Net (loss) income attributable to AECOM	($103,503)	$56,396
Net (loss) income attributable to AECOM per share:
Basic (in dollars per share)	($0.73)	$0.59
Diluted (in dollars per share)	($0.73)	$0.58
Weighted average shares outstanding:
Basic (in shares)	141,892	96,302
Diluted (in shares)	141,892	97,590

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Loss) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consolidated Statements of Comprehensive Income (Loss)
Net (loss) income	($80,330)	$56,541
Other comprehensive income (loss), net of tax:
Net unrealized (loss) gain on derivatives, net of tax	-1,057	316
Foreign currency translation adjustments	-128,099	-25,812
Pension adjustments, net of tax	8,006	-962
Other comprehensive income (loss), net of tax	-121,150	-26,458
Comprehensive (loss) income, net of tax	-201,480	30,083
Noncontrolling interests in comprehensive (loss) income of consolidated subsidiaries, net of tax	-21,112	375
Comprehensive (loss) income attributable to AECOM, net of tax	($222,592)	$30,458

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	($80,330)	$56,541
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	102,122	22,198
Equity in earnings of unconsolidated joint ventures	-23,924	-36,083
Distribution of earnings from unconsolidated joint ventures	42,213	9,170
Non-cash stock compensation	36,017	10,941
Prepayment penalty on unsecured senior notes	55,639
Excess tax benefit from share-based payment	-2,526	-448
Foreign currency translation	-14,546	-9,466
Write-off of debt issuance costs	8,997
Other noncash	2,060	1,185
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	349,148	1,709
Prepaid expenses and other assets	31,172	19,733
Accounts payable	-58,274	72,436
Accrued expenses and other current liabilities	-163,801	-16,873
Billings in excess of costs on uncompleted contracts	10,932	21,241
Other long-term liabilities	-12,257	-8,226
Income taxes payable		-6,671
Net cash provided by operating activities	282,642	137,387
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for business acquisitions, net of cash acquired	-3,277,111	-659
Cash acquired from consolidation of joint venture		18,955
Net investment in unconsolidated joint ventures	-9,127	-519
Purchases of investments	-8,056	-17,555
Proceeds from disposal of property and equipment	4,663
Payments for capital expenditures	-29,733	-20,771
Net cash used in investing activities	-3,319,364	-20,549
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from borrowings under credit agreements	3,858,648	501,927
Repayments of borrowings under credit agreements	-2,053,648	-476,013
Issuance of unsecured senior notes	1,600,000
Net change in overdrafts	-19,961	-9,980
Prepayment penalty on unsecured senior notes	-55,639
Cash paid for equity issuance costs	-86,249
Proceeds from issuance of common stock	3,645	1,803
Proceeds from exercise of stock options	2,383	1,637
Payments to repurchase common stock	-10,957	-33,721
Excess tax benefit from share-based payment	2,526	448
Net distributions to noncontrolling interests	-34,674	-19,368
Net cash used in financing activities	3,206,074	-33,267
EFFECT OF EXCHANGE RATE CHANGES ON CASH	-8,892	-2,505
NET INCREASE IN CASH AND CASH EQUIVALENTS	160,460	81,066
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	574,188	600,677
CASH AND CASH EQUIVALENTS AT END OF YEAR	734,648	681,743
NON-CASH INVESTING AND FINANCING ACTIVITY
Common stock issued in acquisitions	1,554,912
Debt assumed from acquisitions	$567,656

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Dec. 31, 2014
Basis of Presentation
Basis of Presentation	1.Basis of Presentation
	Effective January 5, 2015, the official name of the Company changed from AECOM Technology Corporation to AECOM. The accompanying consolidated financial statements of AECOM (the Company) are unaudited and, in the opinion of management, include all adjustments, including all normal recurring items necessary for a fair statement of the Company’s financial position and results of operations for the periods presented. All inter-company balances and transactions are eliminated in consolidation.
	The consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Form 10-K for the fiscal year ended September 30, 2014 (the Annual Report). The accompanying unaudited consolidated financial statements and related notes have been prepared in accordance with generally accepted accounting principles (GAAP) in the U.S. for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. Certain immaterial reclassifications were made to the prior year to conform to current year presentation.
	In connection with the URS acquisition, commencing with the three months ended December 31, 2014, the Company has realigned its reportable segments from two to three segments to reflect the operations of the combined company. The Company now operates in three reporting segments, as described in more detail in Note 17 — Reporting Segments.
	The consolidated financial statements included in this report, with the exception of the new business segment, have been prepared consistently with the accounting policies described in the Annual Report and should be read together with the Annual Report.
	The Company has revised comparative segment information that was contained in the Company’s Quarterly Report on Form 10-Q for the three months ended December 31, 2013, to reflect the new global business segment structure. The adjusted segment information constitutes a reclassification and has no impact on reported net income or earnings per share for preceding periods. This change does not restate information previously reported in the consolidated statements of income, consolidated balance sheets, consolidated statements of stockholders’ equity or consolidated statements of cash flows for the Company for preceding periods.
	Information included in the Annual Report remains unchanged. This adjusted segment information does not modify or update the disclosures therein in any way, nor does it reflect any subsequent information or events, other than as required to reflect the change in segments as described above.
	The results of operations for the three months ended December 31, 2014 are not necessarily indicative of the results to be expected for the fiscal year ending September 30, 2015.
	The Company reports its annual results of operations based on 52 or 53-week periods ending on the Friday nearest September 30. The Company reports its quarterly results of operations based on periods ending on the Friday nearest December 31, March 31, and June 30. For clarity of presentation, all periods are presented as if the periods ended on September 30, December 31, March 31, and June 30.

New_Accounting_Pronouncements_

New Accounting Pronouncements and Changes in Accounting	3 Months Ended
	Dec. 31, 2014
New Accounting Pronouncements and Changes in Accounting
New Accounting Pronouncements and Changes in Accounting	2.New Accounting Pronouncements and Changes in Accounting
	In February 2013, the Financial Accounting Standards Board (FASB) issued new accounting guidance for the recognition, measurement, and disclosure of obligations resulting from joint and several liability arrangements for which the total amount of the obligation (within the scope of this guidance) is fixed at the reporting date. Examples of obligations within the scope of this guidance include debt arrangements, other contractual obligations, and settled litigation and judicial rulings. This new guidance was effective for annual reporting periods beginning after December 15, 2013 and subsequent interim periods. This guidance was effective for the Company’s fiscal year beginning October 1, 2014 and did not have a material impact on the Company’s consolidated financial statements.
	In July 2013, the FASB issued new accounting guidance that requires the presentation of unrecognized tax benefits as a reduction of the deferred tax assets, when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists at the reporting date. This new guidance was effective for annual reporting periods beginning on or after December 15, 2013 and subsequent interim periods. This guidance was effective for the Company’s fiscal year beginning October 1, 2014 and did not have a material impact on the Company’s consolidated financial statements.
	In May 2014, the FASB issued new accounting guidance which amended the existing accounting standards for revenue recognition. The new accounting guidance establishes principles for recognizing revenue upon the transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. This guidance is effective for the Company’s fiscal year beginning October 1, 2017. Early adoption is not permitted. The amendments may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as of the date of initial application. The Company has not selected a transition method and is currently in the process of evaluating the impact of adoption of the new accounting guidance on its consolidated financial statements.

Business_Acquisitions_Goodwill

Business Acquisitions, Goodwill and Intangible Assets	3 Months Ended
	Dec. 31, 2014
Business Acquisitions, Goodwill, and Intangible Assets
Business Acquisitions, Goodwill, and Intangible Assets	3.Business Acquisitions, Goodwill and Intangible Assets
	On October 17, 2014, the Company completed the acquisition of the U.S. headquartered URS Corporation (URS), an international provider of engineering, construction, and technical services, by purchasing 100% of the outstanding shares of URS common stock. The purpose of the acquisition is to further diversify the Company’s market presence and accelerate the Company’s strategy to create an integrated delivery platform for customers. The Company paid total consideration of approximately $2.3 billion in cash and issued approximately $1.6 billion of AECOM common stock to the former stockholders and certain equity award holders of URS. In connection with the acquisition, the Company also assumed URS’s senior notes totaling $1.0 billion, and subsequently repaid in full URS’s $0.6 billion 2011 term loan and URS’s $0.1 billion revolving line of credit. Upon the occurrence of a change in control of URS, the URS senior noteholders had the right to redeem their notes at a cash price equal to 101% of the principal amount of the notes. Accordingly, on October 24, 2014, the Company purchased $0.6 billion of URS’s senior notes from the noteholders. See also Note 7, Debt.
	The following summarizes the estimated fair values of URS assets acquired and liabilities assumed (in millions), as of the acquisition date:
	Cash and cash equivalents	$	285.2
	Accounts receivable	2,572.00
	Prepaid expenses and other current assets	373.8
	Property and equipment	609.2
	Identifiable intangible assets:
	Customer relationships, contracts and backlog	822.2
	Tradename	7.8
	Total identifiable intangible assets	830
	Goodwill	3,801.00
	Other non-current assets	347.1
	Accounts payable	(750.2		)
	Accrued expenses and other current liabilities	(1,091.4		)
	Billings in excess of costs on uncompleted contracts	(196.1		)
	Current portion of long-term debt	(47.4		)
	Other long-term liabilities	(473.7		)
	Pension and post-retirement benefit obligations	(402.1		)
	Long-term debt	(520.2		)
	Noncontrolling interests	(216.6		)
	Net assets acquired	$	5,120.60
	Backlog and customer relationships represent the fair value of existing contracts and the underlying customer relationships and have lives ranging from 1 to 11 years (weighted average lives of approximately 7 years). Other intangible assets primarily consists of the fair value of office leases.
	The purchase price allocation is based upon preliminary information and is subject to change when additional information is obtained. Goodwill recognized largely results from a substantial assembled workforce, which does not qualify for separate recognition, as well as expected future synergies from combining operations. The Company has not completed its final assessment of the fair values of purchased receivables, intangible assets, property and equipment, tax balances, contingent liabilities, long-term leases or acquired contracts. The final purchase price allocation will result in adjustments to certain assets and liabilities, including the residual amount allocated to goodwill. See Note 16, Commitments and Contingencies, relating to URS project contingencies, including matters disclosed about URS owned Washington Group and Flint Energy Services entities. Included in accrued expenses and other current liabilities above is approximately $100 million related to legal matters.
	The following presents summarized unaudited pro forma operating results assuming that the Company had acquired URS at October 1, 2013. These pro forma operating results are presented for illustrative purposes only and are not indicative of the operating results that would have been achieved had the related events occurred.
		Three Months Ended
		December 31,			December 31,
		2014			2013
		(in millions)
	Revenue	$	4,546		$	4,615
	Income from continuing operations	$	163		$	40
	Net income (loss)	44			$	(57	)
	Net income (loss) attributable to AECOM	$	21		$	(83	)
	Net income (loss) attributable to AECOM per share:
	Basic	$	0.14		$	(0.55	)
	Diluted	$	0.14		$	(0.55	)
	URS contributed $2.0 billion in revenue and $83 million in income from operations during the three months ended December 31, 2014 since the acquisition date, included in the accompanying statement of operations. Amortization of intangible assets relating to URS was $45.2 million during the three months ended December 31, 2014 since the acquisition date. Additionally, included in equity in earnings of joint ventures and noncontrolling interests was intangible amortization expense of $8.4 million and ($4.7) million, respectively, during the three months ended December 31, 2014, related to joint venture fair value adjustments.
	Acquisition and integration expenses in the accompanying consolidated statements of operations for the three months ended December 31, 2014 is comprised of the following (in millions):
	Severance and personnel costs	$	109.3
	Professional service, real estate-related, and other expenses	29.2
	Total	$	138.5
	Included in severance and personnel costs above is $36.6 million of severance expense, of which $4.6 million was paid as of December 31, 2014. All acquisition and integration expenses are classified within corporate, as presented in Note 17. Interest expense in the accompanying consolidated statements of operations for the three months ended December 31, 2014 includes $68.0 million of acquisition related financing expenses that primarily consisted of a $55.6 million penalty from the prepayment of the Company’s unsecured senior notes, and $9.0 million related to the write-off of capitalized debt issuance costs from its unsecured senior notes, unsecured revolving credit facility, and unsecured term credit agreement.
	The changes in the carrying value of goodwill by reportable segment for the three months ended December 31, 2014 and 2013 were as follows:
		September 30,			Post-			Foreign			Acquired		December 31,
		2014			Acquisition			Exchange					2014
					Adjustments			Impact
		(in millions)
	Design and Consulting Services	$	1,479.20		$	5.3		$	(35.3	)	$	1,745.40	$	3,194.60
	Construction Services	276.9			0.2			(8.3		)	404		672.8
	Management Services	181.2			—			(28.4		)	1,651.60		1,804.40
	Total	$	1,937.30		$	5.5		$	(72.0	)	$	3,801.00	$	5,671.80
		September 30,			Post-			Foreign			Acquired		December 31,
		2013			Acquisition			Exchange					2013
					Adjustments			Impact
		(in millions)
	Design and Consulting Services	$	1,414.10		$	5		$	(10.2	)	$	78.2	$	1,487.10
	Construction Services	216.5			—			—			—		216.5
	Management Services	181.2			—			—			—		181.2
	Total	$	1,811.80		$	5		$	(10.2	)	$	78.2	$	1,884.80
	The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of December 31, 2014 and September 30, 2014, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:
		December 31, 2014									September 30, 2014
		Gross			Accumulated			Intangible			Gross		Accumulated			Intangible		Amortization
		Amount			Amortization			Assets, Net			Amount		Amortization			Assets, Net		Period
								(in millions)										(years)
Backlog and customer relationships	$	1,084.50		$	(226.8	)	$	857.7		$	271.6	$	(182.8	)	$	88.8	1 – 11
Trademark / tradename	17			(15.8		)	1.2			9.3		(7.9		)	1.4		2
Total	$	1,101.50		$	(242.6	)	$	858.9		$	280.9	$	(190.7	)	$	90.2
Amortization expense of acquired intangible assets included within cost of revenue was $51.9 million and $5.1 million for the three months ended December 31, 2014 and 2013, respectively. The following table presents estimated amortization expense of intangible assets for the remainder of fiscal 2015 and for the succeeding years:
Fiscal Year	(in millions)
2015 (nine months remaining)	$	152.6
2016	152.9
2017	83.6
2018	80.4
2019	79.5
Thereafter	309.9
Total	$	858.9

Accounts_ReceivableNet

Accounts Receivable-Net	3 Months Ended
	Dec. 31, 2014
Accounts Receivable-Net
Accounts Receivable-Net	4.Accounts Receivable—Net
	Net accounts receivable consisted of the following as of December 31, 2014 and September 30, 2014:
		December 31,			September 30,
		2014			2014
		(in millions)
	Billed	$	2,375.90		$	1,248.40
	Unbilled	2,148.60			1,214.80
	Contract retentions	442			263.9
	Total accounts receivable—gross	4,966.50			2,727.10
	Allowance for doubtful accounts	(92.6		)	(72.1		)
	Total accounts receivable—net	$	4,873.90		$	2,655.00
	Billed accounts receivable represent amounts billed to clients that have yet to be collected. Unbilled accounts receivable represent contract revenue recognized but not yet billed pursuant to contract terms or accounts billed after the period end. Substantially all unbilled receivables as of December 31, 2014 and September 30, 2014 are expected to be billed and collected within twelve months. Contract retentions represent amounts invoiced to clients where payments have been withheld pending the completion of certain milestones, or other contractual conditions or upon the completion of a project. These retention agreements vary from project to project and could be outstanding for several months or years.
	Allowances for doubtful accounts have been determined through specific identification of amounts considered to be uncollectible and potential write-offs, plus a non-specific allowance for other amounts for which some potential loss has been determined to be probable based on current and past experience.
	Other than the U.S. government, no single client accounted for more than 10% of the Company’s outstanding receivables at December 31, 2014 or September 30, 2014.
	The Company has sold trade receivables to financial institutions, of which $129.3 million and $111.9 million was outstanding as of December 31, 2014 and September 30, 2014, respectively. The Company does not retain financial or legal obligations for these receivables that would result in material losses. The Company’s ongoing involvement is limited to the remittance of customer payments to the financial institutions with respect to the sold trade receivables.

Joint_Ventures_and_Variable_In

Joint Ventures and Variable Interest Entities	3 Months Ended
	Dec. 31, 2014
Joint Ventures and Variable Interest Entities
Joint Ventures and Variable Interest Entities	5.Joint Ventures and Variable Interest Entities
	The Company’s joint ventures provide architecture, engineering, program management, construction management and operations and maintenance services. Joint ventures, the combination of two or more partners, are generally formed for a specific project. Management of the joint venture is typically controlled by a joint venture executive committee, comprised of representatives from the joint venture partners. The joint venture executive committee normally provides management oversight and controls decisions which could have a significant impact on the joint venture.
	Some of the Company’s joint ventures have no employees and minimal operating expenses. For these joint ventures, the Company’s employees perform work for the joint venture, which is then billed to a third-party customer by the joint venture. These joint ventures function as pass through entities to bill the third-party customer. For consolidated entities, the Company records the entire amount of the services performed and the costs associated with these services, including the services provided by the other joint venture partners, in the Company’s results of operations. For certain of these joint ventures where a fee is added by an unconsolidated joint venture to client billings, the Company’s portion of that fee is recorded in equity in earnings of joint ventures.
	The Company also has joint ventures that have their own employees and operating expenses, and to which the Company generally makes a capital contribution. The Company accounts for these joint ventures either as consolidated entities or equity method investments based on the criteria further discussed below.
	The Company follows guidance issued by the FASB on the consolidation of variable interest entities (VIEs) that requires companies to utilize a qualitative approach to determine whether it is the primary beneficiary of a VIE. The process for identifying the primary beneficiary of a VIE requires consideration of the factors that indicate a party has the power to direct the activities that most significantly impact the joint venture’s economic performance, including powers granted to the joint venture’s program manager, powers contained in the joint venture governing board and, to a certain extent, a company’s economic interest in the joint venture. The Company analyzes its joint ventures and classifies them as either:
		·		a VIE that must be consolidated because the Company is the primary beneficiary or the joint venture is not a VIE and the Company holds the majority voting interest with no significant participative rights available to the other partners; or
		·		a VIE that does not require consolidation and is treated as an equity method investment because the Company is not the primary beneficiary or the joint venture is not a VIE and the Company does not hold the majority voting interest.
	As part of the above analysis, if it is determined that the Company has the power to direct the activities that most significantly impact the joint venture’s economic performance, the Company considers whether or not it has the obligation to absorb losses or rights to receive benefits of the VIE that could potentially be significant to the VIE.
	Contractually required support provided to the Company’s joint ventures is further discussed in Note 16.
	Summary of unaudited financial information of the consolidated joint ventures is as follows:
			December 31,		September 30,
			2014		2014
			(in millions)
	Current assets		$	623.2	$	314.1
	Non-current assets		321.8		106.2
	Total assets		$	945.0	$	420.3
	Current liabilities		$	389.3	$	229.1
	Non-current liabilities		15.2		—
	Total liabilities		404.5		229.1
	Total AECOM equity		262.1		116.6
	Noncontrolling interests		278.4		74.6
	Total owners’ equity		540.5		191.2
	Total liabilities and owners’ equity		$	945.0	$	420.3
	Total revenue of the consolidated joint ventures was $545.3 million and $95.8 million for the three months ended December 31, 2014 and 2013, respectively. The assets of the Company’s consolidated joint ventures are restricted for use only by the particular joint venture and are not available for the general operations of the Company.
	Summary of unaudited financial information of the unconsolidated joint ventures is as follows:
			December 31,		September 30,
			2014		2014
			(in millions)
	Current assets		$	1,238.7	$	539.6
	Non-current assets		527.6		273.7
	Total assets		$	1,766.3	$	813.3
	Current liabilities		$	773.1	$	397.9
	Non-current liabilities		123.8		91.0
	Total liabilities		896.9		488.9
	Joint ventures’ equity		869.4		324.4
	Total liabilities and joint ventures’ equity		$	1,766.3	$	813.3
	AECOM’s investment in joint ventures		$	348.7	$	142.9
			Three Months Ended
			December 31,		December 31,
			2014		2013
			(in millions)
	Revenue		$	1,081.3	$	518.4
	Cost of revenue		1,027.4		508.4
	Gross profit		$	53.9	$	10.0
	Net income		$	48.3	$	9.2
	Summary of AECOM’s equity in earnings of unconsolidated joint ventures is as follows:
			Three Months Ended
			December 31,		December 31,
			2014		2013
			(in millions)
	Pass through joint ventures		$	6.4	$	0.7
	Other joint ventures		17.5		35.4
	Total		$	23.9	$	36.1
	Included in equity in earnings above, the Company recorded a $37.4 million gain upon change in control ($23.4 million, net of tax) of an unconsolidated joint venture in the quarter ended December 31, 2013. The Company obtained control of the joint venture through modifications to the joint venture’s operating agreement, which required the Company to consolidate the joint venture. The acquisition date fair value of the previously held equity interest was $58.0 million, excluding control premium. The measurement of the fair value of the equity interest immediately before obtaining control of the joint venture resulted in the pre-tax gain of $37.4 million. The Company utilized income and market approaches, in addition to obtaining an independent third party valuation, in determining the joint venture’s fair value, which includes making assumptions about variables such as revenue growth rates, profitability, discount rates, and industry market multiples. These assumptions are subject to a high degree of judgment. Total assets and liabilities of this entity included in the accompanying consolidated balance sheet at acquisition date were $201.0 million and $48.0 million, respectively. This acquisition did not meet the quantitative thresholds to require pro forma disclosures of operating results based on the Company’s consolidated assets, investments and net income. This joint venture performs engineering and program management services in the Middle East and is included in the Company’s DCS segment.

Pension_and_PostRetirement_Ben

Pension and Post-Retirement Benefit Obligations	3 Months Ended
	Dec. 31, 2014
Pension and Post-Retirement Benefit Obligations
Pension and Post-Retirement Benefit Obligations	6.Pension and Post-Retirement Benefit Obligations
	The following table details the components of net periodic cost for the Company’s pension and post-retirement plans for the three months ended December 31, 2014 and 2013:
		Three Months Ended
		December 31, 2014						December 31, 2013
		U.S.			Int’l			U.S.			Int’l
		(in millions)
	Components of net periodic (benefit) cost:
	Service costs	$	1.5		$	0.3		$	—		$	0.2
	Interest cost on projected benefit obligation	6.4			11.3			1.9			6.8
	Expected return on plan assets	(6.7		)	(11.9		)	(2.1		)	(6.4		)
	Amortization of prior service cost	—			(0.1		)	—			—
	Amortization of net loss	1.1			1.5			1			1.2
	Settlement loss recognized	—			0.4			—			—
	Net periodic cost	$	2.3		$	1.5		$	0.8		$	1.8
	The total amounts of employer contributions paid for the three months ended December 31, 2014 were $14.4 million for U.S. plans and $5.4 million for non-U.S. plans. The expected remaining scheduled annual employer contributions for the fiscal year ending September 30, 2015 are $10.3 million for U.S. plans and $19.0 million for non-U.S. plans. The aggregate pension and post-retirement deficit was $612.6 million and $221.3 million as of December 31, 2014 and September 30, 2014, respectively. The long-term portion of the aggregate pension and post-retirement deficit was $599.8 million and $220.7 million as of December 31, 2014 and September 30, 2014, respectively.
	The table below provides the expected future benefit payments related to acquired URS pension and post-retirement obligations as of the date of acquisition, in millions:
	Year Ending September 30	U.S.			Intl.
	2015	$	40.6		$	16.7
	2016	26.2			17.2
	2017	26.8			17.7
	2018	27.4			18.3
	2019	27.8			18.9
	2020 - 2024	144.1			103.5
	Total	$	292.9		$	192.3

Debt

Debt	3 Months Ended
	Dec. 31, 2014
Debt
Debt	7.Debt
	Debt consisted of the following:
		December 31,			September 30,
		2014			2014
		(in millions)
	Secured term credit agreement	$	2,681.10		$	—
	Secured revolving credit facility	79.2			—
	2014 Senior Notes	1,600.00			—
	URS Senior Notes	430.6			—
	Unsecured term credit agreement	—			712.5
	Unsecured senior notes	—			263.9
	Other debt	186.9			27.6
	Total debt	4,977.80			1,004.00
	Less: Current portion of debt and short-term borrowings	(202.4		)	(64.4		)
	Long-term debt, less current portion	$	4,775.40		$	939.6
	The following table presents, in millions, scheduled maturities of the Company’s debt as of December 31, 2014:
	Fiscal Year
	2015 (nine months remaining)	$	166.6
	2016	140.0
	2017	315.0
	2018	119.3
	2019	87.0
	Thereafter	4,149.9
	Total	$	4,977.8
	2014 Credit Agreement
	In connection with the acquisition of URS, on October 17, 2014, the Company entered into a new credit agreement (Credit Agreement) consisting of (i) a term loan A facility in an aggregate principal amount of $1.925 billion, (ii) a term loan B facility in an aggregate principal amount of $0.76 billion, (iii) a revolving credit facility in an aggregate principal amount of $1.05 billion, and (iv) an incremental performance letter of credit facility in an aggregate principal amount of $500 million subject to terms outlined in the Credit Agreement. These facilities under the Credit Agreement may be increased by an additional amount of up to $500 million. The Credit Agreement replaced the Company’s Second Amended and Restated Credit Agreement, dated as of June 7, 2013, and the Company’s Fourth Amended and Restated Credit Agreement, dated as of January 29, 2014, which such prior facilities were terminated and repaid in full on October 17, 2014. In addition, the Company paid in full, including a pre-payment penalty of $55.6 million, its unsecured senior notes (5.43% Series A Notes due July 2020 and 1.00% Series B Senior Discount Notes due July 2022). The new Credit Agreement matures on October 17, 2019 with respect to the revolving credit facility, the term loan A facility, and the incremental performance letter of credit facility. The term loan B facility matures on October 17, 2021. Certain subsidiaries of the Company (Guarantors) have guaranteed the obligations of the borrowers under the Credit Agreement. The borrowers’ obligations under the Credit Agreement are secured by a lien on substantially all of the assets of the Company and the Guarantors pursuant to a security and pledge agreement (Security Agreement). The collateral under the Security Agreement is subject to release upon fulfillment of certain conditions specified in the Credit Agreement and Security Agreement.
	The Credit Agreement contains covenants that limit the ability of the Company and certain of its subsidiaries to, among other things: (i) create, incur, assume, or suffer to exist liens; (ii) incur or guarantee indebtedness; (iii) pay dividends or repurchase stock; (iv) enter into transactions with affiliates; (v) consummate asset sales, acquisitions or mergers; (vi) enter into certain type of burdensome agreements; or (vii) make investments.
	Under the Credit Agreement, the Company is subject to a maximum consolidated leverage ratio and minimum interest coverage ratio at the end of each fiscal quarter beginning with the quarter ending on March 31, 2015. The Company’s Consolidated Leverage Ratio was 4.4 for the three months ended December 31, 2014. As of December 31, 2014, the Company was in compliance with the covenants of its Credit Agreement.
	At December 31, 2014 and September 30, 2014, outstanding standby letters of credit totaled $111.8 million and $12.1 million, respectively, under the Company’s revolving credit facilities. As of December 31, 2014 and September 30, 2014, the Company had $859.0 million and $1,037.9 million available under its revolving credit facility.
	2014 Senior Notes
	On October 6, 2014, the Company completed a private placement offering of $800,000,000 aggregate principal amount of its 5.750% Senior Notes due 2022 (2022 Notes) and $800,000,000 aggregate principal amount of its 5.875% Senior Notes due 2024 (the 2024 Notes and, together with the 2022 Notes, the 2014 Senior Notes or Notes).
	As of December 31, 2014, the estimated fair market value of the Company’s 2014 Senior Notes was approximately $1,652.0 million. The fair value of the Company’s Notes as of December 31, 2014 was derived by taking the mid-point of the trading prices from an observable market input (Level 2) in the secondary loan market and multiplying it by the outstanding balance of its term loan.
	At any time prior to October 15, 2017, the Company may redeem all or part of the 2022 Notes, at a redemption price equal to 100% of their principal amount, plus a “make whole” premium as of the redemption date, and accrued and unpaid interest (subject to the rights of holders of record on the relevant record date to receive interest due on the relevant interest payment date). In addition, at any time prior to October 15, 2017, the Company may redeem up to 35% of the original aggregate principal amount of the 2022 Notes with the proceeds of one or more equity offerings, at a redemption price equal to 105.750%, plus accrued and unpaid interest. Furthermore, at any time on or after October 15, 2017, the Company may redeem the 2022 Notes, in whole or in part, at once or over time, at the specified redemption prices plus accrued and unpaid interest thereon to the redemption date. At any time prior to July 15, 2024, the Company may redeem on one or more occasions all or part of the 2024 Notes at a redemption price equal to the sum of (i) 100% of the principal amount thereof, plus (ii) a “make-whole” premium as of the date of the redemption, plus any accrued and unpaid interest to the date of redemption. In addition, on or after July 15, 2024, the 2024 Notes may be redeemed by the Company at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest to the date of redemption.
	The indenture pursuant to which the 2014 Senior Notes were issued contains customary events of default, including, among other things, payment default, exchange default, failure to provide certain notices thereunder and certain provisions related to bankruptcy events. The indenture also contains customary negative covenants.
	In connection with the offering of the Notes, the Company and the Guarantors entered into a Registration Rights Agreement, dated as of October 6, 2014 and agreed to use commercially reasonable efforts to (i) file with the U.S. Securities and Exchange Commission (SEC) a registration statement relating to the registered exchange offer (Exchange Offer) to exchange the Notes for a new series of the Company’s exchange notes having terms substantially identical in all material respects to, and in the same aggregate principal amount as the Notes, (ii) cause the Exchange Offer registration statement to be declared effective by the SEC on or prior to the 390th day following October 6, 2014 (or if such 390th day is not a business day, the next succeeding business day (Exchange Date)), (iii) cause the Exchange Offer registration statement to be effective continuously and keep the Exchange Offer open for a period not less than 30 days after the date notice of the Exchange Offer is mailed to the holders of the Notes, and (iv) cause the Exchange Offer to be consummated in no event later than the Exchange Date.
	Under certain circumstances, the Company and the Guarantors have agreed to use their commercially reasonable efforts to (i) file a shelf registration statement relating to the resale of the Notes on or prior to the Exchange Date (such date being the Shelf Filing Deadline), (ii) cause the shelf registration statement to be declared effective not later than the 60th day after the Shelf Filing Deadline (or if such 60th day is not a business day, the next succeeding business day), and (iii) keep such shelf registration continuously effective until two years after its effective date (or such shorter period that will terminate when all the Notes covered thereby have been sold pursuant thereto).
	If the Company fails to meet any of these targets, the annual interest rate on the Notes will increase by 0.25%, and will increase by an additional 0.25% for each subsequent 90-day period during which the default continues, up to a maximum additional interest rate of 1.0% per year. If the Company cures the default, the interest rate on the Notes will revert to the original level.
	The Company was in compliance with the covenants relating to its Notes as of December 31, 2014.
	URS Senior Notes
	In connection with the URS acquisition, the Company assumed URS’s 3.85% Senior Notes due 2017 and its 5.00% Senior Notes due 2022 totaling $1.0 billion (URS Senior Notes). The URS acquisition triggered change in control provisions in the URS Senior Notes that allowed URS senior note holders to redeem their URS Senior Notes at a cash price equal to 101% of the principal amount and, accordingly, the Company redeemed $572.3 million of the URS Senior Notes on October 24, 2014. The URS Senior Notes are general unsecured senior obligations of AECOM Global II, LLC (as successor in interest to URS) and URS Fox US LP and are fully and unconditionally guaranteed on a joint-and-several basis by certain former URS domestic subsidiary guarantors.
	As of December 31, 2014, the estimated fair market value of the Company’s URS Senior Notes was approximately $419.8 million. The carrying value of the URS Senior Notes on the Company’s Consolidated Balance Sheets as of December 31, 2014 was $430.6 million. The fair value of the Company’s URS Senior Notes as of December 31, 2014 was derived by taking the mid-point of the trading prices from an observable market input (Level 2) in the secondary loan market and multiplying it by the outstanding balance of its term loan.
	As of December 31, 2014, the Company was in compliance with the covenants relating to the URS Senior Notes.
	Other Debt
	Other debt consists primarily of obligations under capital leases and loans, and unsecured credit facilities. The Company’s unsecured credit facilities are primarily used for standby letters of credit issued for payment of performance guarantees. At December 31, 2014 and September 30, 2014, these outstanding standby letters of credit totaled $332.0 million and $301.0 million, respectively. As of December 31, 2014, the Company had $483.5 million available under these unsecured credit facilities.
	The Company’s average effective interest rate on total borrowings, including the effects of the interest rate swap agreements, during the three months ended December 31, 2014 and 2013 was 4.0% and 2.8%, respectively.

Derivative_Financial_Instrumen

Derivative Financial Instruments	3 Months Ended
	Dec. 31, 2014
Derivative Financial Instruments
Derivative Financial Instruments	8.Derivative Financial Instruments
	The Company uses certain interest rate derivative contracts to hedge interest rate exposures on the Company’s variable rate debt. The Company enters into foreign currency derivative contracts with financial institutions to reduce the risk that its cash flows and earnings will be adversely affected by foreign currency exchange rate fluctuations. The Company’s hedging program is not designated for trading or speculative purposes.
	The Company recognizes derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. The Company records changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as accounting hedges in the accompanying consolidated statements of income as cost of revenue, interest expense, net, or to accumulated other comprehensive loss in the accompanying consolidated balance sheets.
	Cash Flow Hedges
	The Company uses interest rate swap agreements designated as cash flow hedges to fix the variable interest rates on portions of the Company’s debt. The Company also uses foreign currency options designated as cash flow hedges to hedge forecasted transactions denominated in currencies other than the U.S. dollar. The Company initially reports any gain on the effective portion of a cash flow hedge as a component of accumulated other comprehensive loss. Depending on the type of cash flow hedge, the gain is subsequently reclassified to either interest expense when the interest expense on the variable rate debt is recognized, or to cost of revenue when the hedged transactions denominated in currencies other than the U.S. dollar are recorded. If the hedged transaction becomes probable of not occurring, any gain or loss related to interest rate swap agreements or foreign currency options would be recognized in other income (expense). Further, the Company excludes the change in the time value of the foreign currency options from the assessment of hedge effectiveness. The Company records the premium paid or time value of an option on the date of purchase as an asset. Thereafter, the Company recognizes any change to this time value in cost of revenue.
	The notional principal, fixed rates and related expiration dates of the Company’s outstanding interest rate swap agreements were as follows:
		December 31, 2014
		Notional Amount			Fixed		Expiration
		(in millions)			Rate		Date
		$	300.0		1.63	%	June 2018
		250.0			0.95	%	September 2015
		September 30, 2014
		Notional Amount			Fixed		Expiration
		(in millions)			Rate		Date
		$	300.0		1.63	%	June 2018
		250.0			0.95	%	September 2015
		200.0			0.68	%	December 2014
	Foreign Currency Forward Contracts
	The Company uses foreign currency forward contracts, which are not designated as accounting hedges, to hedge intercompany transactions and other monetary assets or liabilities denominated in currencies other than the functional currency of a subsidiary. Gains and losses on these contracts are recognized in cost of revenue for those instruments related to the provision of their respective services or general and administrative expenses, along with the offsetting losses and gains of the related hedged items. The notional principal of foreign currency forward contracts to purchase U.S. dollars with foreign currencies was $96.1 million and $69.5 million at December 31, 2014 and September 30, 2014, respectively. The notional principal of foreign currency forward contracts to sell U.S. dollars for foreign currencies was $98.3 million and $71.5 million at December 31, 2014 and September 30, 2014, respectively. The notional principal of foreign currency forward contracts to purchase GBP with BRL was BRL 3.9 million and BRL 1.1 million (or approximately $1.4 million and $0.4 million) at December 31, 2014 and September 30, 2014, respectively.
	Other Derivatives
	Other derivatives that are not designated as hedging instruments consist of option contracts that the Company uses to hedge anticipated transactions in currencies other than the functional currency of a subsidiary. The Company recognizes gains and losses on these contracts as well as the offsetting losses and gains of the related hedged item costs in cost of sales. The Company records the premium paid or time value of an option on the date of purchase as an asset. Thereafter, the Company recognizes any change to this time value in cost of revenue. There was no such option contract outstanding during the periods presented.
	The fair values of our outstanding derivative instruments were as follows (in millions):
				Fair Value of Derivative
				Instruments as of
		Balance Sheet Location		Dec 31,			Sep 30,
				2014			2014
	Derivative assets
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	Other non-current asset		$	0.1		$	1.7
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts	Prepaid expenses and other current assets		3.9			3.1
	Total			$	4.0		$	4.8
	Derivative liabilities
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	Accrued expenses and other current liabilities		$	4.9		$	4.8
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts	Accrued expenses and other current liabilities		3.3			3.7
	Total			$	8.2		$	8.5
	At December 31, 2014, the effective portion of the Company’s interest rate swap agreements designated as cash flow hedges before tax effect was $4.8 million, of which $4.9 million is expected to be reclassified from accumulated other comprehensive loss to interest expense within the next 12 months. At December 31, 2014, there were no foreign currency options designated as cash flow hedges.
	The effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income is summarized below (in millions):
		Increase in Losses
		Recognized in Accumulated
		Other Comprehensive Loss
		on Derivatives Before Tax
		Effect (Effective Portion)
		Three Months Ended Dec 31,
		2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements	$	(2.5	)	$	(0.3	)
				Losses Reclassified from
				Accumulated Other
				Comprehensive Loss into
				Income (Effective Portion)
				Three Months Ended Dec 31,
		Location		2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements	Interest expense		$	(0.8	)	$	(0.8	)
	There was no foreign currency options outstanding during the three months ended December 31, 2014. The gain recognized in accumulated other comprehensive loss from the Company’s foreign currency options was immaterial for the three months ended December 31, 2013. The gain reclassified from accumulated other comprehensive loss into income from the foreign currency options was immaterial in any of the periods presented. Additionally, there were no losses recognized in income due to amounts excluded from effectiveness testing from the Company’s interest rate swap agreements.
	The effect of derivative instruments not designated as hedging instruments on income is summarized below (in millions):
				Gains / (Losses) Recognized
				in Income on Derivatives
				(Amount Excluded from
				Effectiveness Testing and
				Ineffective Portion) (1)
Three Months Ended Dec 31,
	Location		2014			2013
Derivatives not designated as hedging instruments:
Foreign currency forward contracts	General and administrative expenses		$	(0.5	)	$	(2.2	)
(1)Losses related to the ineffective portion of the hedges were not material in all periods presented.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Dec. 31, 2014
Fair Value Measurements
Fair Value Measurements	9.Fair Value Measurements
	Fair value is the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining fair value, the Company considers the principal or most advantageous market in which it would transact, and the Company considers assumptions that market participants would use when pricing the asset or liability. It measures certain financial and nonfinancial assets and liabilities at fair value on a recurring and nonrecurring basis.
	Nonfinancial assets and liabilities include items such as goodwill and long lived assets that are measured at fair value resulting from impairment, if deemed necessary. During the three months ended December 31, 2014 and 2013, the Company did not record any fair value adjustments to those financial and nonfinancial assets and liabilities measured at fair value on a nonrecurring basis.
	Fair Value Hierarchy
	The three levels of inputs that may be used to measure fair value are as follows:
		·		Level 1  Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.
		·		Level 2  Observable inputs other than quoted prices included within Level 1, such as quoted prices for similar assets or liabilities, quoted prices in markets with insufficient volume or infrequent transactions (less active markets), or model-derived valuations in which all significant inputs are observable or can be derived principally from or corroborated with observable market data for substantially the full term of the assets or liabilities.
		·		Level 3  Unobservable inputs that are significant to the measurement of the fair value of assets or liabilities.
	The following table summarizes the Company’s non-pension financial assets and liabilities measured at fair value on a recurring basis (at least annually) in millions:
			December 31,		Quoted Prices in
			2014		Active Markets for
					Identical Assets
					(Level 2)
	Interest rate swap agreements		$	0.1	$	0.1
	Foreign currency forward contracts		3.9		3.9
	Total assets		$	4.0	$	4.0
	Interest rate swap agreements		$	4.9	$	4.9
	Foreign currency forward contracts		3.3		3.3
	Total liabilities		$	8.2	$	8.2
			September 30,		Quoted Prices in
			2014		Active Markets for
					Similar Assets
					(Level 2)
	Interest rate swap agreements		$	1.7	$	1.7
	Foreign currency forward contracts		3.1		3.1
	Total assets		$	4.8	$	4.8
	Interest rate swap agreements		$	4.8	$	4.8
	Foreign currency forward contracts		3.7		3.7
	Total liabilities		$	8.5	$	8.5

Leases

Leases	3 Months Ended
	Dec. 31, 2014
Leases
Leases	10. Leases
	The Company and its subsidiaries are lessees in non-cancelable leasing agreements for office buildings and equipment. The related payments are expensed on a straight-line basis over the lease term, including, as applicable, any free-rent period during which the Company has the right to use the asset. For leases with renewal options where the renewal is reasonably assured, the lease term, including the renewal period, is used to determine the appropriate lease classification and to compute periodic rental expense. The following table presents, in millions, amounts payable under non-cancelable operating lease commitments during the following fiscal years:
	Year Ending September 30,
	2015 (remaining nine months)	$	318.7
	2016	312.6
	2017	247.1
	2018	191.0
	2019	158.4
	Thereafter	431.3
	Total	$	1,659.1

Sharebased_Payments

Share-based Payments	3 Months Ended
	Dec. 31, 2014
Share-based Payments
Share-based Payments	11.Share-based Payments
	The fair value of the Company’s employee stock option awards is estimated on the date of grant. The expected term of awards granted represents the period of time the awards are expected to be outstanding. The risk-free interest rate is based on U.S. Treasury bond rates with maturities equal to the expected term of the option on the grant date. The Company uses historical data as a basis to estimate the probability of forfeitures. The Company did not grant any employee stock options during the three months ended December 31, 2014 and 2013.
	Stock option activity for the three months ended December 31 was as follows:
		2014				2013
		Shares of stock		Weighted average		Shares of stock		Weighted average
		under options		exercise price		under options		exercise price
		(in millions)				(in millions)
	Outstanding at September 30	1.6		$	27.69	1.6		$	24.73
	Options granted	—		—		—		—
	Options exercised	(0.1	)	26.24		(0.1	)	17.23
	Options forfeited or expired	—		27.55		(0.1	)	26.74
	Outstanding at December 31	1.5		27.75		1.4		25.15
	Vested and expected to vest in the future as of December 31	1.5		$	27.75	1.4		$	25.15
	The Company grants stock units to employees under its Performance Earnings Program (PEP), whereby units are earned and issued dependent upon meeting established cumulative performance objectives and vesting over a three-year period. Additionally, the Company issues restricted stock units to employees which are earned based on service conditions. The grant date fair value of PEP awards and restricted stock unit awards is that day’s closing market price of the Company’s common stock. The weighted average grant date fair value of PEP awards were $32.38 and $29.22 during the quarters ended December 31, 2014 and 2013, respectively. The weighted average grant date fair value of restricted stock unit awards were $31.06 and $29.19 during the quarters ended December 31, 2014 and 2013, respectively. Included in the restricted stock unit grants during the quarter ended December 31, 2014 were 2.6 million restricted stock units with a grant date fair value of $30.04 that were converted from unvested URS service based restricted stock awards assumed by the Company in connection with the acquisition of URS. Total compensation expense related to share-based payments was $62.3 million and $10.9 million during the three months ended December 31, 2014 and 2013, respectively. Included in total compensation expense during the three months ended December 31, 2014 was $43.9 million related to the settlement of accelerated URS equity awards with $17.6 million of Company stock and $26.3 million in cash which was classified as acquisition and integration expense. Unrecognized compensation expense related to total share-based payments outstanding was $175.2 million and $62.4 million as of December 31, 2014 and September 30, 2014, respectively, to be recognized on a straight-line basis over the awards’ respective vesting periods which are generally three years.
	Cash flows attributable to tax benefits resulting from tax deductions in excess of compensation cost recognized for those stock options (excess tax benefits) is classified as financing cash flows. Excess tax benefits of $2.5 million and $0.4 million for the three months ended December 31, 2014 and 2013, respectively, have been classified as financing cash inflows in the consolidated statements of cash flows.

Income_Taxes

Income Taxes	3 Months Ended
	Dec. 31, 2014
Income Taxes
Income Taxes	12.Income Taxes
	The Company’s effective tax rate from continuing operations was 20.3% and 29.3% for the three months ended December 31, 2014 and 2013, respectively. The most significant items contributing to the difference between the statutory U.S. federal income tax rate of 35% and the Company’s effective tax rate for the three month period ended December 31, 2014 were the impact of non-controlling income of interests in consolidated subsidiaries, the tax rate differential on foreign earnings, the recognition of discrete items related to the extension of previously expired research and development credits and other energy related incentives, partially offset by an increase in non-deductible transaction and other costs.
	The Company utilizes the annual effective tax rate method under ASC 740 to compute its interim tax provision. The Company’s effective tax rate fluctuates from quarter to quarter due to various factors including the change in the mix of global income, tax law changes, outcomes of administrative audits, changes in the assessment of valuation allowances and other tax contingencies. During the quarter, the Tax Increase Prevention Act of 2014 was signed into law which extended certain business tax provisions and incentives through 2014. These extenders provided a discrete benefit to the Company’s quarterly effective tax rate of approximately $6.0 million or 6%.
	The Company believes the outcomes which are reasonably possible within the next twelve months, including lapses in statutes of limitations, will not result in a material change in the liability for uncertain tax positions.
	Generally, the Company does not provide for U.S. taxes or foreign withholding taxes on undistributed earnings from non-U.S. subsidiaries because such earnings are able to and intended to be reinvested indefinitely. Determination of the amount of any unrecognized deferred income tax liability on this temporary difference is not practicable because of the complexities of the hypothetical calculation. The Company recorded a deferred tax liability in the amount of $108.9 million relating to certain foreign subsidiaries for which the undistributed earnings are not intended to be reinvested indefinitely as part of the liabilities assumed in connection with the acquisition of URS on October 17, 2014.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Dec. 31, 2014
Earnings Per Share
Earnings Per Share	13.Earnings Per Share
	Basic earnings per share (EPS) excludes dilution and is computed by dividing net income available for common stockholders by the weighted average number of common shares outstanding for the period. Diluted EPS is computed by dividing net income by the weighted average number of common shares outstanding and potential common stock equivalent shares for the period. The Company includes as potential common shares the weighted average dilutive effects of outstanding stock options and restricted stock units using the treasury stock method. For the three months ended December 31, 2014 and 2013, options excluded from the calculation of potential common shares were not significant. The computation of diluted loss per share for the three months ended December 31, 2014 excludes 2.0 million of potential common shares due to their antidilutive effect.
	The following table sets forth a reconciliation of the denominators for basic and diluted earnings per share:
		Three Months Ended
		December 31,	December 31,
		2014	2013
		(in millions)
	Denominator for basic earnings per share	141.9	96.3
	Potential common shares	—	1.3
	Denominator for diluted earnings per share	141.9	97.6

Other_Financial_Information

Other Financial Information	3 Months Ended
	Dec. 31, 2014
Other Financial Information
Other Financial Information	14.Other Financial Information
	Accrued expenses and other current liabilities consist of the following:
		December 31,		September 30,
		2014		2014
		(in millions)
	Accrued salaries and benefits	$	866.0	$	400.6
	Accrued contract costs	773.7		446.4
	Other accrued expenses	214.6		117.6
		$	1,854.3	$	964.6
	Accrued contract costs above include balances related to professional liability accruals of $244.8 million and $120.2 million as of December 31, 2014 and September 30, 2014, respectively. The remaining accrued contract costs primarily relate to costs for services provided by subcontractors and other non-employees.

Reclassification_out_of_Accumu

Reclassification out of Accumulated Other Comprehensive Loss	3 Months Ended
	Dec. 31, 2014
Reclassifications out of Accumulated Other Comprehensive Loss
Reclassifications out of Accumulated Other Comprehensive Loss	15.Reclassifications out of Accumulated Other Comprehensive Loss
	The accumulated balances and reporting period activities for the three months ended December 31, 2014 and 2013 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions):
			Pension			Foreign			Loss on			Accumulated
			Related			Currency			Derivative			Other
			Adjustments			Translation			Instruments			Comprehensive
						Adjustments						Loss
	Balances at September 30, 2014		$	(217.0	)	$	(137.8	)	$	(1.8	)	$	(356.6	)
	Other comprehensive income (loss) before reclassification		6.2			(126.0		)	(1.5		)	(121.3		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax		1.8			—			—			1.8
	Cash flow hedge losses, net of tax		—			—			0.4			0.4
	Balances at December 31, 2014		$	(209.0	)	$	(263.8	)	$	(2.9	)	$	(475.7	)
			Pension			Foreign			Loss on			Accumulated
			Related			Currency			Derivative			Other
			Adjustments			Translation			Instruments			Comprehensive
						Adjustments						Loss
	Balances at September 30, 2013		$	(192.8	)	$	(66.4	)	$	(2.1	)	$	(261.3	)
	Other comprehensive income before reclassification		(2.5		)	(25.2		)	(0.2		)	(27.9		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax		1.5			—			—			1.5
	Cash flow hedge losses, net of tax		—			—			0.5			0.5
	Balances at December 31, 2013		$	(193.8	)	$	(91.6	)	$	(1.8	)	$	(287.2	)
	Amounts Reclassified from Accumulated Other		Three Months Ended			Three Months Ended
	Comprehensive Loss		December 31, 2014			December 31, 2013
	Cash flow hedges(1)		$	0.7		$	0.8
	Taxes		(0.3		)	(0.3		)
	Cash flow hedges, net of tax		$	0.4		$	0.5
	Actuarial losses(2)		$	2.6		$	2.1
	Taxes		(0.8		)	(0.6		)
	Actuarial losses, net of tax		$	1.8		$	1.5
		-1		This accumulated other comprehensive component is reclassified in Interest expense in our Consolidated Statements of Income. See Note 8, Derivative Financial Instruments, for more information.
		-2		This accumulated other comprehensive component is reclassified in Cost of revenue and General and administrative expenses in our Consolidated Statements of Income. See Note 6, Pension and Post-Retirement Benefit Obligations, for more information.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Dec. 31, 2014
Commitments and Contingencies
Commitments and Contingencies	16.Commitments and Contingencies
	The Company records amounts representing its probable estimated liabilities relating to claims, guarantees, litigation, audits and investigations. The Company relies in part on qualified actuaries to assist it in determining the level of reserves to establish for insurance-related claims that are known and have been asserted against it, and for insurance-related claims that are believed to have been incurred based on actuarial analysis, but have not yet been reported to the Company’s claims administrators as of the respective balance sheet dates. The Company includes any adjustments to such insurance reserves in its consolidated results of operations.
	The Company is a defendant in various lawsuits arising in the normal course of business. In the opinion of management, based on current information and discussions with counsel, with the exception of matters noted below, the ultimate resolution of these matters will not have a material adverse effect on its consolidated balance sheet or statements of income or cash flows.
	In some instances, the Company guarantees that a project, when complete, will achieve specified performance standards. If the project subsequently fails to meet guaranteed performance standards, the Company may either incur additional costs or be held responsible for the costs incurred by the client to achieve the required performance standards. At December 31, 2014, the Company was contingently liable in the amount of approximately $443.8 million under standby letters of credit issued primarily in connection with general and professional liability insurance programs and for payment and performance guarantees.
	In the ordinary course of business, the Company enters into various agreements providing financial or performance assurances to clients on behalf of certain unconsolidated partnerships, joint ventures and other jointly executed contracts. These agreements are entered into primarily to support the project execution commitments of these entities. In addition, in connection with the investment activities of AECOM Capital, we provide guarantees of certain obligations, including guarantees for completion of projects, repayment of debt, environmental indemnity obligations and acts of willful misconduct. The guarantees have various expiration dates. The maximum potential payment amount of an outstanding performance guarantee is the remaining cost of work to be performed by or on behalf of third parties. Generally, under joint venture arrangements, if a partner is financially unable to complete its share of the contract, the other partner(s) will be required to complete those activities. The Company generally only enters into joint venture arrangements with partners who are reputable, financially sound and who carry appropriate levels of surety bonds for the project in order to adequately assure completion of their assignments. The Company does not expect that these guarantees will have a material adverse effect on its consolidated balance sheet or statements of income or cash flows.
	USAID Egyptian Projects
	In November 2004, the federal government filed a civil action in Idaho federal district court against Washington Group International, a Delaware company (WGI), an affiliate of URS Corporation (URS), which the Company acquired on October 17, 2014, and two of WGI’s subcontractors, asserting violations under the Federal False Claims Act and Federal Foreign Assistance Act of 1961 for failure to comply with U.S. Agency for International Development (USAID) source, origin, and nationality regulations in connection with five USAID-financed Egyptian projects beginning in the early 1990s. The federal government seeks a refund of the approximately $373 million paid to WGI under the contracts for the five completed and fully operational projects as well as damages and civil penalties (including doubling and trebling of damages) for violation of the statutes. In March 2005, WGI filed motions in Idaho federal district court and the United States Bankruptcy Court in Nevada contending that the federal government’s Idaho federal district court action was barred under the plan of reorganization approved by the Bankruptcy Court in 2002 when WGI emerged from bankruptcy protection. In 2006, the Idaho federal district court action was stayed pending the bankruptcy-related proceedings. On April 24, 2012, the Bankruptcy Court ruled that the bulk of the federal government’s claims under the Federal False Claims and the Federal Foreign Assistance Acts are not barred. On November 7, 2012, WGI appealed the Bankruptcy Court’s decision to the Ninth Circuit Bankruptcy Appellate Panel. On August 2, 2013, the Appellate Panel affirmed the Bankruptcy Court’s decision. On September 26, 2013, WGI appealed the Appellate Panel’s decision to the United States Ninth Circuit Court of Appeals.
	WGI contests the federal government’s allegations and intends to continue to defend this matter vigorously; however, WGI cannot provide assurance that it will be successful in these efforts.
	DOE Deactivation, Demolition, and Removal Project
	Washington Group International, an Ohio company (WGI Ohio), an affiliate of URS, executed a cost-reimbursable task order with the Department of Energy (DOE) in 2007 to provide deactivation, demolition and removal services at a New York State project site that, during 2010, experienced contamination and performance issues and remains uncompleted. In February 2011, WGI Ohio and the DOE executed a Task Order Modification that changed some cost-reimbursable contract provisions to at-risk. The Task Order Modification, including subsequent amendments, requires the DOE to pay all project costs up to $106 million, requires WGI Ohio and the DOE to equally share in all project costs incurred from $106 million to $146 million, and requires WGI Ohio to pay all project costs exceeding $146 million. WGI Ohio has incurred total project costs of approximately $300 million.
	Due to unanticipated requirements and permitting delays by federal and state agencies, as well as delays and related ground stabilization activities caused by Hurricane Irene in 2011, WGI Ohio has been required to perform work outside the scope of the Task Order Modification. In December 2014, WGI Ohio submitted claims against the DOE pursuant to the Contracts Disputes Acts seeking recovery of $103 million, including additional fees on changed work scope. Due to significant delays and uncertainties about responsibilities for the scope of remaining work, final costs necessary to complete this project may exceed $100 million.
	WGI Ohio can provide no certainty that it will recover the DOE claims and fees submitted in December 2014, as well as any other project costs after December 2014 that WGI Ohio is obligated to incur including the remaining project completion costs, which could have a material adverse effect on the Company’s results of operations.
	Canadian Pipeline Contract
	In January 2010, a pipeline owner filed an action in the Court of Queen’s Bench of Alberta, Canada against Flint Energy Services Ltd. (Flint), an affiliate of URS, as well as against a number of other defendants, alleging that the defendants negligently provided pipe coating and insulation system services, engineering, design services, construction services, and other work, causing damage to and abandonment of the line. The pipeline owner alleges it has suffered approximately C$85 million in damages in connection with the abandonment and replacement of the pipeline. Flint was the construction contractor on the pipeline project. Other defendants were responsible for engineering and design-services and for specifying and providing the actual pipe, insulation and coating materials used in the line. In January 2011, the pipeline owner served a Statement of Claim on Flint and, in September 2011, Flint filed a Statement of Defense denying that the damages to the coating system of the pipeline were caused by any negligence or breach of contract of Flint.
	Flint disputes the pipeline owner’s claims and intends to continue to defend this matter vigorously; however, it cannot provide assurance that it will be successful, in whole or in part, in these efforts.
	Waste Isolation Pilot Plant Environmental Incidents
	URS is a member of Nuclear Waste Partnership, LLC, a joint venture that manages and operates the Waste Isolation Pilot Plant (WIPP), a DOE federal waste repository in New Mexico designed to dispose of low level transuranic (TRU) radioactive waste generated by federal facilities. On February 5, 2014, an underground vehicle fire suspended operations at WIPP. On February 14, 2014, in a separate and unrelated event, a TRU waste container that originated from Los Alamos National Laboratory breached and released low levels of radiological contaminants from the mine at WIPP into the atmosphere. On December 6, 2014, the DOE and Nuclear Waste Partnership received an administrative compliance order and civil penalty of $17.7 million from the New Mexico Environment Department alleging violations of the Resource Conservation and Recovery Act and the New Mexico Hazardous Waste Act due to WIPP’s failure to prevent the underground fire and the radiological release. In addition, disposal operations at WIPP have been suspended until a final recovery plan can be implemented.
	Nuclear Waste Partnership and the DOE disputes these administrative findings and plans to defend this matter vigorously; however, Nuclear Waste Partnership cannot provide assurance that it will be successful in these efforts.
	Tishman Inquiry
	The U.S. Attorney’s Office for the Eastern District of New York (USAO) has informed the Company’s subsidiary Tishman Construction Corporation (TCC) that, in connection with a wage and hour investigation of several New York area contractors, the USAO is investigating potential improper overtime payments to union workers on projects managed by TCC and other contractors in New York dating back to 1999. TCC, which was acquired by the Company in 2010, has cooperated fully with the investigation and, as of this date, no actions have been filed.
	AECOM Australia
	In 2005 and 2006, the Company’s main Australian subsidiary, AECOM Australia Pty Ltd (AECOM Australia), performed a traffic forecast assignment for a client consortium as part of the client’s project to design, build, finance and operate a tolled motorway tunnel in Australia. To fund the motorway’s design and construction, the client formed certain special purpose vehicles (SPVs) that raised approximately $700 million Australian dollars through an initial public offering (IPO) of equity units in 2006 and approximately an additional $1.4 billion Australian dollars in long term bank loans. The SPVs went into insolvency administrations in February 2011.
	KordaMentha, the receivers for the SPVs (the RCM Applicants), caused a lawsuit to be filed against AECOM Australia by the RCM Applicants in the Federal Court of Australia on May 14, 2012. Portigon AG (formerly WestLB AG), one of the lending banks to the SPVs, filed a lawsuit in the Federal Court of Australia against AECOM Australia on May 18, 2012. Separately, a class action lawsuit, which has been amended to include approximately 770 of the IPO investors, was filed against AECOM Australia in the Federal Court of Australia on May 31, 2012.
	All of the lawsuits claim damages that purportedly resulted from AECOM Australia’s role in connection with the above described traffic forecast. The RCM Applicants have claimed damages of approximately $1.68 billion Australian dollars (including interest, as of March 31, 2014). The damages claimed by Portigon as of June 17, 2014 were also recently quantified at approximately $76 million Australian dollars (including interest). The Company believes this claim is duplicative of damages already included in the RCM Applicants’ claim to the extent Portigon receives a portion of the RCM Applicants’ recovery. The class action applicants claim that they represent investors who acquired approximately $155 million Australian dollars of securities.
	AECOM Australia disputes the claimed entitlements to damages asserted by all applicants and continues to defend this matter vigorously; AECOM Australia cannot provide assurance that it will be successful in these efforts. The potential range of loss and the resolution of this matter cannot be determined at this time and could have a material adverse effect on AECOM Australia and the  results of its operations.
	URS Merger Litigation
	Between July 21 and August 4, 2014, six then-stockholders of URS brought lawsuits in the Court of Chancery of the State of Delaware (Delaware Court) entitled Falato v. URS Corp, et al., C.A. No. 9921-CB, City of Atlanta Firefighters’ Pension Fund v. Creel, et al., C.A. No. 9924-CB, Petroutson v. URS Corp., et al., C.A. No. 9938, Miller v. URS Corp., et al., C.A. No. 9939-CB, Oklahoma Police Pension & Retirement System v. Creel, et al., C.A. No. 9975-CB, and Cambridge Retirement System v. Creel, et al., C.A. No. 9998-CB (collectively, Lawsuits), alleging that the board of directors of URS breached its fiduciary duties in connection with URS’s then-proposed merger with the Company (Merger) and that the Company aided and abetted such breaches. Plaintiffs in the Lawsuits sought to, among other things, enjoin enforcement of a provision in the applicable merger agreement that plaintiffs called the “Anti-Waiver Provision” and that plaintiffs had alleged was impeding the potential for the emergence of competing bids for URS.
	Between July 31, 2014 and August 4, 2014, URS and the Company clarified to the Delaware Court and the plaintiffs that their intent with respect to the “Anti-Waiver Provision” was that any standstill required by that provision would not preclude any potential alternative suitor from making a topping bid for URS and agreed to (1) waive all extant standstills contained in non-disclosure agreements (NDAs) signed by pre-signing bidders for URS; (2) ensure that any standstills contained in NDAs executed by potential suitors post-signing would contain an exception to permit those potential suitors to make topping bids for URS; (3) clarify the operation of any post-signing standstill to potential suitors for URS; and (4) disclose the same in URS’s proxy statement seeking stockholder support for the Merger, which clarification and agreements plaintiffs considered to moot the claims asserted in the Lawsuits.
	On August 28, 2014, the Delaware Court entered an order dismissing the Lawsuits as moot. On October 16, 2014, URS stockholders voted to approve the Merger, which closed the following day. On November 17, 2014, plaintiffs’ counsel in the Lawsuits petitioned the Delaware Court for an award of attorneys’ fees and reimbursement of expenses, and after negotiations, the Company has agreed to pay fees and expenses of $900,000.

Reportable_Segments

Reportable Segments	3 Months Ended
	Dec. 31, 2014
Reportable Segments
Reportable Segments	17.Reportable Segments
	As discussed in Note 1 — Basis of Presentation, in connection with the acquisition of URS, the Company’s reportable segments have been realigned to reflect how the Company now manages its business. Accordingly, prior year amounts have been revised to conform to the current year presentation.
	The Company’s operations are organized into three reportable segments: Design and Consulting Services (DCS), Construction Services (CS), and Management Services (MS). The Company’s DCS reportable segment delivers planning, consulting, architectural, environmental, and engineering design services to commercial and government clients worldwide. The Company’s CS reportable segment provides construction services primarily in the Americas. The Company’s MS reportable segment provides program and facilities management and maintenance, training, logistics, consulting, and technical assistance and systems integration services, primarily for agencies of the U.S. government. These reportable segments are organized by the types of services provided, the differing specialized needs of the respective clients, and how the Company manages its business. The Company has aggregated various operating segments into its reportable segments based on their similar characteristics, including similar long term financial performance, the nature of services provided, internal processes for delivering those services, and types of customers.
	The following tables set forth summarized financial information concerning the Company’s reportable segments:
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
		(in millions)
	Three Months Ended December 31, 2014:
	Revenue	$	1,877.00		$	1,530.40		$	778.6		$	—		$	4,186.00
	Gross profit	49.3			52.9			62			—			164.2
	Equity in earnings of joint ventures	1.5			5.9			16.5			—			23.9
	General and administrative expenses	—			—			—			(34.3		)	(34.3		)
	Acquisition and integration expenses	—			—			—			(138.5		)	(138.5		)
	Operating income	50.8			58.8			78.5			(172.8		)	15.3
	Gross profit as a % of revenue	2.6		%	3.5		%	8		%	—			3.9		%
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
		(in millions)
	Three Months Ended December 31, 2013:
	Revenue	$	1,301.40		$	428.7		$	223.8		$	—		$	1,953.90
	Gross profit	53.9			4.1			20.2			—			78.2
	Equity in earnings of joint ventures	32.8			1.4			1.9			—			36.1
	General and administrative expenses	—			—			—			(23.9		)	(23.9		)
	Operating income	86.7			5.5			22.1			(23.9		)	90.4
	Gross profit as a % of revenue	4.1		%	1		%	9		%	—			4		%
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
	Total assets
	31-Dec-14	$	7,242.8		$	3,205.5		$	3,252.3		$	552.7		$	14,253.3
	30-Sep-14	4,064.5			1,256.4			437.5			365.0			6,123.4

Business_Acquisitions_Goodwill1

Business Acquisitions, Goodwill and Intangible Assets (Tables)	3 Months Ended
	Dec. 31, 2014
Business Acquisitions, Goodwill, and Intangible Assets
Schedule of estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates	The following summarizes the estimated fair values of URS assets acquired and liabilities assumed (in millions), as of the acquisition date:
	Cash and cash equivalents	$	285.2
	Accounts receivable	2,572.00
	Prepaid expenses and other current assets	373.8
	Property and equipment	609.2
	Identifiable intangible assets:
	Customer relationships, contracts and backlog	822.2
	Tradename	7.8
	Total identifiable intangible assets	830
	Goodwill	3,801.00
	Other non-current assets	347.1
	Accounts payable	(750.2		)
	Accrued expenses and other current liabilities	(1,091.4		)
	Billings in excess of costs on uncompleted contracts	(196.1		)
	Current portion of long-term debt	(47.4		)
	Other long-term liabilities	(473.7		)
	Pension and post-retirement benefit obligations	(402.1		)
	Long-term debt	(520.2		)
	Noncontrolling interests	(216.6		)
	Net assets acquired	$	5,120.60
Schedule of pro forma operating results
		Three Months Ended
		December 31,			December 31,
		2014			2013
		(in millions)
	Revenue	$	4,546		$	4,615
	Income from continuing operations	$	163		$	40
	Net income (loss)	44			$	(57	)
	Net income (loss) attributable to AECOM	$	21		$	(83	)
	Net income (loss) attributable to AECOM per share:
	Basic	$	0.14		$	(0.55	)
	Diluted	$	0.14		$	(0.55	)
Schedule of acquisition and integration expenses
	Acquisition and integration expenses in the accompanying consolidated statements of operations for the three months ended December 31, 2014 is comprised of the following (in millions):
	Severance and personnel costs	$	109.3
	Professional service, real estate-related, and other expenses	29.2
	Total	$	138.5
Schedule of changes in the carrying value of goodwill by reportable segment
		September 30,			Post-			Foreign			Acquired		December 31,
		2014			Acquisition			Exchange					2014
					Adjustments			Impact
		(in millions)
	Design and Consulting Services	$	1,479.20		$	5.3		$	(35.3	)	$	1,745.40	$	3,194.60
	Construction Services	276.9			0.2			(8.3		)	404		672.8
	Management Services	181.2			—			(28.4		)	1,651.60		1,804.40
	Total	$	1,937.30		$	5.5		$	(72.0	)	$	3,801.00	$	5,671.80
		September 30,			Post-			Foreign			Acquired		December 31,
		2013			Acquisition			Exchange					2013
					Adjustments			Impact
		(in millions)
	Design and Consulting Services	$	1,414.10		$	5		$	(10.2	)	$	78.2	$	1,487.10
	Construction Services	216.5			—			—			—		216.5
	Management Services	181.2			—			—			—		181.2
	Total	$	1,811.80		$	5		$	(10.2	)	$	78.2	$	1,884.80
Schedule of finite-lived intangible assets by major class
		December 31, 2014									September 30, 2014
		Gross			Accumulated			Intangible			Gross		Accumulated			Intangible		Amortization
		Amount			Amortization			Assets, Net			Amount		Amortization			Assets, Net		Period
								(in millions)										(years)
	Backlog and customer relationships	$	1,084.50		$	(226.8	)	$	857.7		$	271.6	$	(182.8	)	$	88.8	1 – 11
	Trademark / tradename	17			(15.8		)	1.2			9.3		(7.9		)	1.4		2
	Total	$	1,101.50		$	(242.6	)	$	858.9		$	280.9	$	(190.7	)	$	90.2
Schedule of estimated future amortization expense of intangible assets
	Fiscal Year	(in millions)
	2015 (nine months remaining)	$	152.6
	2016	152.9
	2017	83.6
	2018	80.4
	2019	79.5
	Thereafter	309.9
	Total	$	858.9

Accounts_ReceivableNet_Tables

Accounts Receivable-Net (Tables)	3 Months Ended
	Dec. 31, 2014
Accounts Receivable-Net
Schedule of net accounts receivable
		December 31,			September 30,
		2014			2014
		(in millions)
	Billed	$	2,375.90		$	1,248.40
	Unbilled	2,148.60			1,214.80
	Contract retentions	442			263.9
	Total accounts receivable—gross	4,966.50			2,727.10
	Allowance for doubtful accounts	(92.6		)	(72.1		)
	Total accounts receivable—net	$	4,873.90		$	2,655.00

Joint_Ventures_and_Variable_In1

Joint Ventures and Variable Interest Entities (Tables)	3 Months Ended
	Dec. 31, 2014
Joint Ventures and Variable Interest Entities
Summary of unaudited financial information of the consolidated joint ventures
		December 31,		September 30,
		2014		2014
		(in millions)
	Current assets	$	623.2	$	314.1
	Non-current assets	321.8		106.2
	Total assets	$	945.0	$	420.3
	Current liabilities	$	389.3	$	229.1
	Non-current liabilities	15.2		—
	Total liabilities	404.5		229.1
	Total AECOM equity	262.1		116.6
	Noncontrolling interests	278.4		74.6
	Total owners’ equity	540.5		191.2
	Total liabilities and owners’ equity	$	945.0	$	420.3
Summary of unaudited financial information of the unconsolidated joint ventures
		December 31,		September 30,
		2014		2014
		(in millions)
	Current assets	$	1,238.7	$	539.6
	Non-current assets	527.6		273.7
	Total assets	$	1,766.3	$	813.3
	Current liabilities	$	773.1	$	397.9
	Non-current liabilities	123.8		91.0
	Total liabilities	896.9		488.9
	Joint ventures’ equity	869.4		324.4
	Total liabilities and joint ventures’ equity	$	1,766.3	$	813.3
	AECOM’s investment in joint ventures	$	348.7	$	142.9
		Three Months Ended
		December 31,		December 31,
		2014		2013
		(in millions)
	Revenue	$	1,081.3	$	518.4
	Cost of revenue	1,027.4		508.4
	Gross profit	$	53.9	$	10.0
	Net income	$	48.3	$	9.2
Summary of AECOM's equity in earnings of unconsolidated joint ventures
		Three Months Ended
		December 31,		December 31,
		2014		2013
		(in millions)
	Pass through joint ventures	$	6.4	$	0.7
	Other joint ventures	17.5		35.4
	Total	$	23.9	$	36.1

Pension_and_PostRetirement_Ben1

Pension and Post-Retirement Benefit Obligations (Tables)	3 Months Ended
	Dec. 31, 2014
Pension and Post-Retirement Benefit Obligations
Components of net periodic cost for the Company's pension and post-retirement plans
		Three Months Ended
		December 31, 2014						December 31, 2013
		U.S.			Int’l			U.S.			Int’l
		(in millions)
	Components of net periodic (benefit) cost:
	Service costs	$	1.5		$	0.3		$	—		$	0.2
	Interest cost on projected benefit obligation	6.4			11.3			1.9			6.8
	Expected return on plan assets	(6.7		)	(11.9		)	(2.1		)	(6.4		)
	Amortization of prior service cost	—			(0.1		)	—			—
	Amortization of net loss	1.1			1.5			1			1.2
	Settlement loss recognized	—			0.4			—			—
	Net periodic cost	$	2.3		$	1.5		$	0.8		$	1.8
Schedule of expected future benefit payments	The table below provides the expected future benefit payments related to acquired URS pension and post-retirement obligations as of the date of acquisition, in millions:
	Year Ending September 30	U.S.			Intl.
	2015	$	40.6		$	16.7
	2016	26.2			17.2
	2017	26.8			17.7
	2018	27.4			18.3
	2019	27.8			18.9
	2020 - 2024	144.1			103.5
	Total	$	292.9		$	192.3

Debt_Tables

Debt (Tables)	3 Months Ended
	Dec. 31, 2014
Debt
Schedule of debt
		December 31,			September 30,
		2014			2014
		(in millions)
	Secured term credit agreement	$	2,681.10		$	—
	Secured revolving credit facility	79.2			—
	2014 Senior Notes	1,600.00			—
	URS Senior Notes	430.6			—
	Unsecured term credit agreement	—			712.5
	Unsecured senior notes	—			263.9
	Other debt	186.9			27.6
	Total debt	4,977.80			1,004.00
	Less: Current portion of debt and short-term borrowings	(202.4		)	(64.4		)
	Long-term debt, less current portion	$	4,775.40		$	939.6
Schedule of maturities of debt	The following table presents, in millions, scheduled maturities of the Company’s debt as of December 31, 2014:
	Fiscal Year
	2015 (nine months remaining)	$	166.6
	2016	140.0
	2017	315.0
	2018	119.3
	2019	87.0
	Thereafter	4,149.9
	Total	$	4,977.8

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	3 Months Ended
	Dec. 31, 2014
Derivative Financial Instruments
Notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements
		December 31, 2014
		Notional Amount			Fixed		Expiration
		(in millions)			Rate		Date
		$	300.0		1.63	%	June 2018
		250.0			0.95	%	September 2015
		September 30, 2014
		Notional Amount			Fixed		Expiration
		(in millions)			Rate		Date
		$	300.0		1.63	%	June 2018
		250.0			0.95	%	September 2015
		200.0			0.68	%	December 2014
Fair values of outstanding derivative instruments	The fair values of our outstanding derivative instruments were as follows (in millions):
				Fair Value of Derivative
				Instruments as of
		Balance Sheet Location		Dec 31,			Sep 30,
				2014			2014
	Derivative assets
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	Other non-current asset		$	0.1		$	1.7
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts	Prepaid expenses and other current assets		3.9			3.1
	Total			$	4.0		$	4.8
	Derivative liabilities
	Derivatives designated as hedging instruments:
	Interest rate swap agreements	Accrued expenses and other current liabilities		$	4.9		$	4.8
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts	Accrued expenses and other current liabilities		3.3			3.7
	Total			$	8.2		$	8.5
Summary of effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income	The effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income is summarized below (in millions):
		Increase in Losses
		Recognized in Accumulated
		Other Comprehensive Loss
		on Derivatives Before Tax
		Effect (Effective Portion)
		Three Months Ended Dec 31,
		2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements	$	(2.5	)	$	(0.3	)
				Losses Reclassified from
				Accumulated Other
				Comprehensive Loss into
				Income (Effective Portion)
				Three Months Ended Dec 31,
		Location		2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements	Interest expense		$	(0.8	)	$	(0.8	)
Summary of effect of derivative instruments not designated as hedging instruments on income	The effect of derivative instruments not designated as hedging instruments on income is summarized below (in millions):
				Gains / (Losses) Recognized
				in Income on Derivatives
				(Amount Excluded from
				Effectiveness Testing and
				Ineffective Portion) (1)
				Three Months Ended Dec 31,
		Location		2014			2013
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts	General and administrative expenses		$	(0.5	)	$	(2.2	)
	(1)Losses related to the ineffective portion of the hedges were not material in all periods presented.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Dec. 31, 2014
Fair Value Measurements
Non-pension financial assets and liabilities measured at fair value on a recurring basis	The following table summarizes the Company’s non-pension financial assets and liabilities measured at fair value on a recurring basis (at least annually) in millions:
		December 31,		Quoted Prices in
		2014		Active Markets for
				Identical Assets
				(Level 2)
	Interest rate swap agreements	$	0.1	$	0.1
	Foreign currency forward contracts	3.9		3.9
	Total assets	$	4.0	$	4.0
	Interest rate swap agreements	$	4.9	$	4.9
	Foreign currency forward contracts	3.3		3.3
	Total liabilities	$	8.2	$	8.2
		September 30,		Quoted Prices in
		2014		Active Markets for
				Similar Assets
				(Level 2)
	Interest rate swap agreements	$	1.7	$	1.7
	Foreign currency forward contracts	3.1		3.1
	Total assets	$	4.8	$	4.8
	Interest rate swap agreements	$	4.8	$	4.8
	Foreign currency forward contracts	3.7		3.7
	Total liabilities	$	8.5	$	8.5

Leases_Tables

Leases (Tables)	3 Months Ended
	Dec. 31, 2014
Leases
Schedule of amounts payable under non-cancelable operating lease commitments	The following table presents, in millions, amounts payable under non-cancelable operating lease commitments during the following fiscal years:
	Year Ending September 30,
	2015 (remaining nine months)	$	318.7
	2016	312.6
	2017	247.1
	2018	191.0
	2019	158.4
	Thereafter	431.3
	Total	$	1,659.1

Sharebased_Payments_Tables

Share-based Payments (Tables)	3 Months Ended
	Dec. 31, 2014
Share-based Payments
Schedule of stock option activity
		2014				2013
		Shares of stock		Weighted average		Shares of stock		Weighted average
		under options		exercise price		under options		exercise price
		(in millions)				(in millions)
	Outstanding at September 30	1.6		$	27.69	1.6		$	24.73
	Options granted	—		—		—		—
	Options exercised	(0.1	)	26.24		(0.1	)	17.23
	Options forfeited or expired	—		27.55		(0.1	)	26.74
	Outstanding at December 31	1.5		27.75		1.4		25.15
	Vested and expected to vest in the future as of December 31	1.5		$	27.75	1.4		$	25.15

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Dec. 31, 2014
Earnings Per Share
Reconciliation of the denominators for basic and diluted EPS
		Three Months Ended
		December 31,	December 31,
		2014	2013
		(in millions)
	Denominator for basic earnings per share	141.9	96.3
	Potential common shares	—	1.3
	Denominator for diluted earnings per share	141.9	97.6

Other_Financial_Information_Ta

Other Financial Information (Tables)	3 Months Ended
	Dec. 31, 2014
Other Financial Information
Schedule of accrued expenses and other current liabilities
		December 31,		September 30,
		2014		2014
		(in millions)
	Accrued salaries and benefits	$	866.0	$	400.6
	Accrued contract costs	773.7		446.4
	Other accrued expenses	214.6		117.6
		$	1,854.3	$	964.6

Reclassifications_out_of_Accum

Reclassifications out of Accumulated Other Comprehensive Losses (Tables)	3 Months Ended
	Dec. 31, 2014
Reclassifications out of Accumulated Other Comprehensive Loss
Schedule of accumulated balances and reporting period activities related to reclassifications out of accumulated other comprehensive loss
	The accumulated balances and reporting period activities for the three months ended December 31, 2014 and 2013 related to reclassifications out of accumulated other comprehensive loss are summarized as follows (in millions):
			Pension			Foreign			Loss on			Accumulated
			Related			Currency			Derivative			Other
			Adjustments			Translation			Instruments			Comprehensive
						Adjustments						Loss
	Balances at September 30, 2014		$	(217.0	)	$	(137.8	)	$	(1.8	)	$	(356.6	)
	Other comprehensive income (loss) before reclassification		6.2			(126.0		)	(1.5		)	(121.3		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax		1.8			—			—			1.8
	Cash flow hedge losses, net of tax		—			—			0.4			0.4
	Balances at December 31, 2014		$	(209.0	)	$	(263.8	)	$	(2.9	)	$	(475.7	)
			Pension			Foreign			Loss on			Accumulated
			Related			Currency			Derivative			Other
			Adjustments			Translation			Instruments			Comprehensive
						Adjustments						Loss
	Balances at September 30, 2013		$	(192.8	)	$	(66.4	)	$	(2.1	)	$	(261.3	)
	Other comprehensive income before reclassification		(2.5		)	(25.2		)	(0.2		)	(27.9		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax		1.5			—			—			1.5
	Cash flow hedge losses, net of tax		—			—			0.5			0.5
	Balances at December 31, 2013		$	(193.8	)	$	(91.6	)	$	(1.8	)	$	(287.2	)
Schedule of amounts reclassified from accumulated other comprehensive loss
	Amounts Reclassified from Accumulated Other		Three Months Ended			Three Months Ended
	Comprehensive Loss		December 31, 2014			December 31, 2013
	Cash flow hedges(1)		$	0.7		$	0.8
	Taxes		(0.3		)	(0.3		)
	Cash flow hedges, net of tax		$	0.4		$	0.5
	Actuarial losses(2)		$	2.6		$	2.1
	Taxes		(0.8		)	(0.6		)
	Actuarial losses, net of tax		$	1.8		$	1.5
		-1		This accumulated other comprehensive component is reclassified in Interest expense in our Consolidated Statements of Income. See Note 8, Derivative Financial Instruments, for more information.
		-2		This accumulated other comprehensive component is reclassified in Cost of revenue and General and administrative expenses in our Consolidated Statements of Income. See Note 6, Pension and Post-Retirement Benefit Obligations, for more information.

Reportable_Segments_Tables

Reportable Segments (Tables)	3 Months Ended
	Dec. 31, 2014
Reportable Segments
Summarized financial information concerning the Company's reportable segments
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
		(in millions)
	Three Months Ended December 31, 2014:
	Revenue	$	1,877.00		$	1,530.40		$	778.6		$	—		$	4,186.00
	Gross profit	49.3			52.9			62			—			164.2
	Equity in earnings of joint ventures	1.5			5.9			16.5			—			23.9
	General and administrative expenses	—			—			—			(34.3		)	(34.3		)
	Acquisition and integration expenses	—			—			—			(138.5		)	(138.5		)
	Operating income	50.8			58.8			78.5			(172.8		)	15.3
	Gross profit as a % of revenue	2.6		%	3.5		%	8		%	—			3.9		%
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
		(in millions)
	Three Months Ended December 31, 2013:
	Revenue	$	1,301.40		$	428.7		$	223.8		$	—		$	1,953.90
	Gross profit	53.9			4.1			20.2			—			78.2
	Equity in earnings of joint ventures	32.8			1.4			1.9			—			36.1
	General and administrative expenses	—			—			—			(23.9		)	(23.9		)
	Operating income	86.7			5.5			22.1			(23.9		)	90.4
	Gross profit as a % of revenue	4.1		%	1		%	9		%	—			4		%
	Reportable Segments:	Design and			Construction			Management			Corporate			Total
		Consulting			Services			Services
		Services
	Total assets
	31-Dec-14	$	7,242.8		$	3,205.5		$	3,252.3		$	552.7		$	14,253.3
	30-Sep-14	4,064.5			1,256.4			437.5			365.0			6,123.4

Basis_of_Presentation_Details

Basis of Presentation (Details)	3 Months Ended
	Dec. 31, 2014
Minimum
Length of fiscal year	364 days
Maximum
Length of fiscal year	371 days

Business_Acquisitions_Goodwill2

Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Dec. 31, 2014	Oct. 17, 2014	Dec. 31, 2013	Oct. 24, 2014
Pro Forma Operating Results
Total	$138,463,000
Write-off of debt issuance costs	8,997,000
URS Corporation
Business Acquisition [Line Items]
Percentage of ownership acquired		100.00%
Consideration paid in cash		2,300,000,000
Consideration paid by issuing stock		1,600,000,000
Senior notes assumed in acquisition as part of consideration		1,000,000,000
Repayment of acquiree term loan as part of consideration		600,000,000
Repayment of acquiree line of credit as part of consideration		100,000,000
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Cash and cash equivalents		285,200,000
Accounts receivable		2,572,000,000
Prepaid expenses and other current assets		373,800,000
Property and equipment		609,200,000
Total identifiable intangible assets		830,000,000
Goodwill		3,801,000,000
Other non-current assets		347,100,000
Accounts payable		-750,200,000
Accrued expenses and other current liabilities		-1,091,400,000
Billings in excess of cost on uncompleted contracts		-196,100,000
Current portion of long-term debt		-47,400,000
Other long-term liabilities		-473,700,000
Pension and post-retirement benefit obligations		-402,100,000
Long-term debt		-520,200,000
Noncontrolling interests		-216,600,000
Net assets acquired		5,120,600,000
Accrued Liabilities and Other Liabilities		100,000,000
Pro Forma Operating Results
Revenue	4,546,000,000		4,615,000,000
Income from continuing operations	163,000,000		40,000,000
Net income (loss)	44,000,000		-57,000,000
Net income (loss) attributable to AECOM	21,000,000		-83,000,000
Revenue of acquiree since acquisition date	2,000,000,000
Income from continuing operations of acquiree since acquisition date	83,000,000
Amortization of intangible assets of acquiree since acquisition date	45,200,000
Fair value adjustment of joint ventures	8,400,000
Fair value adjustment of noncontrolling interests	-4,700,000
Severance and personnel costs	109,300,000
Professional service, real estate-related, and other expenses	29,200,000
Total	138,500,000
Severance expense	36,600,000
Severance expense paid	4,600,000
Financing-related expenses	68,000,000
Penalty from prepayment of unsecured senior notes	55,600,000
Net income (loss) attributable to AECOM per share:
Basic	$0.14		($0.55)
Diluted	$0.14		($0.55)
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		822,200,000
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		7 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		7,800,000
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		$600,000,000		$572,300,000

Business_Acquisitions_Goodwill3

Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$1,937,338,000	$1,811,800,000
Post-Acquisition Adjustments	5,500,000	5,000,000
Foreign Exchange Impact	-72,000,000	-10,200,000
Acquired	3,801,000,000	78,200,000
Goodwill at the end of the period	5,671,767,000	1,884,800,000
Design and Consulting Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	1,479,200,000	1,414,100,000
Post-Acquisition Adjustments	5,300,000	5,000,000
Foreign Exchange Impact	-35,300,000	-10,200,000
Acquired	1,745,400,000	78,200,000
Goodwill at the end of the period	3,194,600,000	1,487,100,000
Construction Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	276,900,000		216,500,000
Post-Acquisition Adjustments	200,000
Foreign Exchange Impact	-8,300,000
Acquired	404,000,000
Goodwill at the end of the period	672,800,000	216,500,000	216,500,000
Management Services
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	181,200,000		181,200,000
Foreign Exchange Impact	-28,400,000
Acquired	1,651,600,000
Goodwill at the end of the period	$1,804,400,000	$181,200,000	$181,200,000

Business_Acquisitions_Goodwill4

Business Acquisitions, Goodwill and Intangible Assets (Details 3) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years
2015 (nine months remaining)	$152,600,000
2016	152,900,000
2017	83,600,000
2018	80,400,000
2019	79,500,000
Thereafter	309,900,000
Intangible Assets, Net	858,860,000		90,238,000
Gross Amount	1,101,500,000		280,900,000
Accumulated Amortization	-242,600,000		-190,700,000
Intangible Assets, Net	858,860,000		90,238,000
Amortization expense	51,900,000	5,100,000
Backlog and customer relationship
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years
Intangible Assets, Net	857,700,000		88,800,000
Gross Amount	1,084,500,000		271,600,000
Accumulated Amortization	-226,800,000		-182,800,000
Intangible Assets, Net	857,700,000		88,800,000
Backlog and customer relationship | Minimum
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years
Amortization Period	1 year
Backlog and customer relationship | Maximum
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years
Amortization Period	11 years
Trademark / tradename
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years
Intangible Assets, Net	1,200,000		1,400,000
Gross Amount	17,000,000		9,300,000
Accumulated Amortization	-15,800,000		-7,900,000
Intangible Assets, Net	$1,200,000		$1,400,000
Amortization Period	2 years

Accounts_ReceivableNet_Details

Accounts Receivable-Net (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Sep. 30, 2014
Accounts Receivable-Net
Billed	$2,375,900,000	$1,248,400,000
Unbilled	2,148,600,000	1,214,800,000
Contract retentions	442,000,000	263,900,000
Total accounts receivable-gross	4,966,500,000	2,727,100,000
Allowance for doubtful accounts	-92,600,000	-72,100,000
Total accounts receivable -net	4,873,911,000	2,654,976,000
Period in which unbilled receivables are expected to be billed and collected	12 months
Sale of trade receivables, outstanding	$129,300,000	$111,900,000

Joint_Ventures_and_Variable_In2

Joint Ventures and Variable Interest Entities (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
	item
Financial information
Number of employees in some joint ventures	0
Current assets	$6,100,785,000		$3,434,113,000
TOTAL ASSETS	14,253,269,000		6,123,377,000
Current liabilities	4,413,077,000		2,455,769,000
TOTAL LIABILITIES	10,413,957,000		3,850,897,000
Total AECOM equity	3,550,220,000		2,186,517,000
Noncontrolling interests	289,092,000		85,963,000
TOTAL STOCKHOLDERS' EQUITY	3,839,312,000		2,272,480,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	14,253,269,000		6,123,377,000
AECOM's investment in joint ventures	348,671,000		142,901,000
Gross Profit	164,223,000	78,198,000
Joint ventures summarized financial information
Revenue	4,186,035,000	1,953,875,000
Cost of revenue	4,021,812,000	1,875,677,000
Gross Profit	164,223,000	78,198,000
Net (loss) income	-80,330,000	56,541,000
Summary of AECOM's equity in earnings of unconsolidated joint ventures:
Total	23,924,000	36,083,000
Minimum
Financial information
Number of partners required to form joint ventures	2
Consolidated Joint Ventures [Member]
Financial information
Current assets	623,200,000		314,100,000
Non-current assets	321,800,000		106,200,000
TOTAL ASSETS	945,000,000		420,300,000
Current liabilities	389,300,000		229,100,000
Non-current liabilities	15,200,000
TOTAL LIABILITIES	404,500,000		229,100,000
Total AECOM equity	262,100,000		116,600,000
Noncontrolling interests	278,400,000		74,600,000
TOTAL STOCKHOLDERS' EQUITY	540,500,000		191,200,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	945,000,000		420,300,000
Joint ventures summarized financial information
Revenue	545,300,000	95,800,000
Consolidated Joint Venture During Quarter Ended 03312014 [Member]
Financial information
TOTAL ASSETS		201,000,000
TOTAL LIABILITIES		48,000,000
Equity in earnings of unconsolidated joint ventures
Gain (loss) from equity in earnings of joint ventures due to the change in control	37,400,000
Gain (loss) from equity in earnings of joint ventures due to the change in control, net of tax	23,400,000
Fair value of the previously held equity interest, excluding control premium	58,000,000
Unconsolidated Joint Ventures [Member]
Financial information
Current assets	1,238,700,000		539,600,000
Non-current assets	527,600,000		273,700,000
TOTAL ASSETS	1,766,300,000		813,300,000
Current liabilities	773,100,000		397,900,000
Non-current liabilities	123,800,000		91,000,000
TOTAL LIABILITIES	896,900,000		488,900,000
TOTAL STOCKHOLDERS' EQUITY	869,400,000		324,400,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,766,300,000		813,300,000
AECOM's investment in joint ventures	348,700,000		142,900,000
Gross Profit	53,900,000	10,000,000
Joint ventures summarized financial information
Revenue	1,081,300,000	518,400,000
Cost of revenue	1,027,400,000	508,400,000
Gross Profit	53,900,000	10,000,000
Net (loss) income	48,300,000	9,200,000
Summary of AECOM's equity in earnings of unconsolidated joint ventures:
Pass through joint ventures	6,400,000	700,000
Other joint ventures	17,500,000	35,400,000
Total	$23,900,000	$36,100,000

Pension_and_PostRetirement_Ben2

Pension and Post-Retirement Benefit Obligations (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Change in benefit obligation:
Aggregate pension and post-retirement deficit	$612,600,000		$221,300,000
Long-term portion of the aggregate pension and post-retirement deficit	599,783,000		220,742,000
United States Pension Plan of US Entity, Defined Benefit [Member]
Components of net periodic (benefit) cost:
Service costs	1,500,000
Interest cost on projected benefit obligation	6,400,000	1,900,000
Expected return on plan assets	-6,700,000	-2,100,000
Amortization of prior service cost	0
Amortization of net loss	1,100,000	1,000,000
Settlement loss recognized	0
Net periodic cost	2,300,000	800,000
Change in benefit obligation:
Employer contributions	14,400,000
Expected employer contributions in next fiscal year	10,300,000
United States Pension Plan of US Entity, Defined Benefit [Member] | URS Corporation
Expected future benefit payments
2015	40,600,000
2016	26,200,000
2017	26,800,000
2018	27,400,000
2019	27,800,000
2020-2024	144,100,000
Total	292,900,000
Foreign Pension Plan, Defined Benefit [Member]
Components of net periodic (benefit) cost:
Service costs	300,000	200,000
Interest cost on projected benefit obligation	11,300,000	6,800,000
Expected return on plan assets	-11,900,000	-6,400,000
Amortization of prior service cost	-100,000
Amortization of net loss	1,500,000	1,200,000
Settlement loss recognized	400,000
Net periodic cost	1,500,000	1,800,000
Change in benefit obligation:
Employer contributions	5,400,000
Expected employer contributions in next fiscal year	19,000,000
Foreign Pension Plan, Defined Benefit [Member] | URS Corporation
Expected future benefit payments
2015	16,700,000
2016	17,200,000
2017	17,700,000
2018	18,300,000
2019	18,900,000
2020-2024	103,500,000
Total	$192,300,000

Debt_Details

Debt (Details) (USD $)	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 17, 2014	Oct. 24, 2014	Sep. 30, 2014	Oct. 06, 2014
Debt
Total debt	$4,977,800,000				$1,004,000,000
Less: Current portion of debt and short-term borrowings	-202,400,000				-64,400,000
Long-term debt, less current portion	4,775,396,000				939,565,000
Scheduled maturities of debt:
2015 (nine months remaining)	166,600,000
2016	140,000,000
2017	315,000,000
2018	119,300,000
2019	87,000,000
Thereafter	4,149,900,000
Total debt	4,977,800,000				1,004,000,000
Debt agreements
Repayment of indebtedness	2,053,648,000	476,013,000
Prepayment Penalty On Unsecured Senior Notes	55,639,000
Debt	4,977,800,000				1,004,000,000
Actual net worth of the entity	3,550,220,000				2,186,517,000
Average effective interest rate on total borrowings, including the effects of swaps (as a percent)	4.00%	2.80%
Line of Credit [Member]
Debt agreements
Consolidated leverage ratio	4.4
Outstanding letters of credit	111,800,000				12,100,000
Remaining borrowing capacity under the credit facility	859,000,000				1,037,900,000
Maximum increase in borrowing capacity			500,000,000
Secured Debt [Member]
Debt
Total debt	2,681,100,000
Scheduled maturities of debt:
Total debt	2,681,100,000
Debt agreements
Debt	2,681,100,000
Revolving Credit Facility [Member]
Debt agreements
Borrowing capacity			1,050,000,000
Letter of Credit [Member]
Debt agreements
Borrowing capacity			500,000,000
URS Corporation
Debt agreements
Senior notes assumed in acquisition as part of consideration			1,000,000,000
Notes Payable to Banks
Debt
Total debt					712,500,000
Scheduled maturities of debt:
Total debt					712,500,000
Debt agreements
Debt					712,500,000
Senior Notes
Debt
Total debt					263,900,000
Scheduled maturities of debt:
Total debt					263,900,000
Debt agreements
Debt					263,900,000
Fair value of debt instrument	1,652,000,000
Senior Notes | URS Corporation
Debt
Total debt	430,600,000			1,000,000,000
Scheduled maturities of debt:
Total debt	430,600,000			1,000,000,000
Debt agreements
Debt	430,600,000			1,000,000,000
Redemption price percentage			101.00%	101.00%
Amount of notes purchased			600,000,000	572,300,000
Fair value of long term debt	419,800,000
Senior Notes 5.00 Percent Due 2022 | URS Corporation
Debt agreements
Interest rate (as a percent)				5.00%
Senior Notes 3.85 Percent Due 2017 | URS Corporation
Debt agreements
Interest rate (as a percent)				3.85%
Senior Notes 5.43 Percent Series A Due July 2020 [Member]
Debt agreements
Interest rate (as a percent)			5.43%
Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member]
Debt agreements
Interest rate (as a percent)			1.00%
Other Debt
Debt
Total debt	186,900,000				27,600,000
Scheduled maturities of debt:
Total debt	186,900,000				27,600,000
Debt agreements
Debt	186,900,000				27,600,000
Outstanding letters of credit	332,000,000				301,000,000
Unsecured Credit Facilities
Debt agreements
Remaining borrowing capacity under the credit facility	483,500,000
Revolving Credit Facility [Member]
Debt
Total debt	79,200,000
Scheduled maturities of debt:
Total debt	79,200,000
Debt agreements
Debt	79,200,000
Term Loan A
Debt agreements
Borrowing capacity			1,925,000,000
Term Loan B
Debt agreements
Borrowing capacity			760,000,000
Notes
Debt
Total debt	1,600,000,000
Scheduled maturities of debt:
Total debt	1,600,000,000
Debt agreements
Debt	1,600,000,000
The 2022 Notes
Debt agreements
Principal amount						800,000,000
Interest rate (as a percent)						5.75%
The 2024 Notes
Debt agreements
Principal amount						$800,000,000
Interest rate (as a percent)						5.88%

Debt_Details_2

Debt (Details 2) (USD $)	0 Months Ended
	Oct. 06, 2014
Notes
Debt
Maximum duration within which the registration statement relating to the registered exchange offer is required to be declared effective	390 days
Minimum period that the exchange offer is required to be kept open after the date notice of the exchange offer is mailed to the holders of the Notes	30 days
Maximum duration within which the shelf registration statement relating to the resale of the Notes is required to be declared effective	60 days
Percentage of increase in annual interest rate when the debt is in default	0.25%
Additional percentage of increase in annual interest rate for each subsequent 90-day period during which the default continues	0.25%
Period during which additional percentage of increase in annual interest rate continues when the debt is in default	90 days
Maximum additional interest rate per year when the debt is in default	1.00%
The 2022 Notes
Debt
Principal amount	800,000,000
Interest rate (as a percent)	5.75%
The 2024 Notes
Debt
Principal amount	800,000,000
Interest rate (as a percent)	5.88%
Redemption period one | The 2022 Notes
Debt
Redemption period, end date	15-Oct-17
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed	100.00%
Percentage price of original principal amount of note at which note can be redeemed	105.75%
Redemption period two | The 2024 Notes
Debt
Redemption period, end date	15-Jul-24
Percentage price of original principal amount of note, excluding required premium, at which note can be redeemed	100.00%
Redemption period three | The 2024 Notes
Debt
Redemption period, start date	15-Jul-24
Percentage price of original principal amount of note at which note can be redeemed	100.00%
Maximum | Redemption period one | The 2022 Notes
Debt
Percentage of principal amount that can be redeemed	35.00%

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details)

3 Months Ended

In Millions, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Dec. 31, 2014

Dec. 31, 2014

Sep. 30, 2014

Sep. 30, 2014

Dec. 31, 2014

Sep. 30, 2014

Cash Flow Hedging [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Not Designated as Hedging Instrument [Member]

Interest Rate Swap [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Cash Flow Hedging [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Foreign Exchange Forward [Member]

Options Held [Member]

Options Held [Member]

USD ($)

Interest Rate Swap [Member]

Interest Rate Swap [Member]

Interest Rate Swap June 2018 [Member]

Interest Rate Swap June 2018 [Member]

Interest Rate Swap September 2015 [Member]

Interest Rate Swap September 2015 [Member]

Interest Rate Swap December 2014 [Member]

United States of America, Dollars

United States of America, Dollars

United States of America, Dollars

United States of America, Dollars

Brazil, Brazil Real

Brazil, Brazil Real

Brazil, Brazil Real

Brazil, Brazil Real

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

Purchase

Purchase

Sell

Sell

Purchase

Purchase

Purchase

Purchase

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

BRL

USD ($)

BRL

Derivative financial instruments

Effective portion of derivatives before tax effect

$4.80

($2.50)

($0.30)

Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to interest expense, net

4.9

Notional Amount

300

300

250

250

200

96.1

69.5

98.3

71.5

1.4

3.9

0.4

1.1

Fixed Rate (as a percent)

1.63%

1.63%

0.95%

0.95%

0.68%

Notional principal of derivative exchange contracts

$0

$0

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Fair values of outstanding derivative instruments
Derivative assets	$4		$4.80
Derivative liabilities	8.2		8.5
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Effect of derivative instruments on income and other comprehensive income
Increase in Losses Recognized in Accumulated Other Comprehensive Loss on Derivatives Before Tax Effect (Effective Portion)	4.8
Designated as Hedging Instrument [Member] | Foreign Exchange Option [Member] | Cash Flow Hedging [Member]
Effect of derivative instruments on income and other comprehensive income
Options outstanding	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Effect of derivative instruments on income and other comprehensive income
Increase in Losses Recognized in Accumulated Other Comprehensive Loss on Derivatives Before Tax Effect (Effective Portion)	-2.5	-0.3
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Effect of derivative instruments on income and other comprehensive income
Losses Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)	-0.8	-0.8
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Accrued Expenses and Other Current Liabilities [Member]
Fair values of outstanding derivative instruments
Derivative liabilities	4.9		4.8
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Noncurrent Asset [Member]
Fair values of outstanding derivative instruments
Derivative assets	0.1		1.7
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | General and Administrative Expense [Member]
Effect of derivative instruments on income and other comprehensive income
Non designated derivatives, Gains/(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)	-0.5	-2.2
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets [Member]
Fair values of outstanding derivative instruments
Derivative assets	3.9		3.1
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Accrued Expenses and Other Current Liabilities [Member]
Fair values of outstanding derivative instruments
Derivative liabilities	$3.30		$3.70

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)	Dec. 31, 2014	Sep. 30, 2014
In Millions, unless otherwise specified
Estimate of Fair Value Measurement [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	$4	$4.80
Total liabilities	8.2	8.5
Estimate of Fair Value Measurement [Member] | Foreign Exchange Forward [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	3.9	3.1
Total liabilities	3.3	3.7
Estimate of Fair Value Measurement [Member] | Interest Rate Swap [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1	1.7
Total liabilities	4.9	4.8
Fair Value, Inputs, Level 2 [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	4	4.8
Total liabilities	8.2	8.5
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	3.9	3.1
Total liabilities	3.3	3.7
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Non-pension financial assets and liabilities measured at fair value
Total assets	0.1	1.7
Total liabilities	$4.90	$4.80

Leases_Details

Leases (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Amounts payable under non-cancelable operating lease commitments
2015 (remaining nine months)	$318.70
2016	312.6
2017	247.1
2018	191
2019	158.4
Thereafter	431.3
Total	$1,659.10

Sharebased_Payments_Details

Share-based Payments (Details) (USD $)	3 Months Ended		12 Months Ended
In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Compensation expense
Granted (in shares)	2.6
Granted (in dollars per share)	$30.04
Recognized compensation expense	$62.30	$10.90
Accelerated compensation expense	43.9
Accelerated settlement Of Common Stock	17.6
Award settlement Of Cash	26.3
Unrecognized compensation expense	$175.20		$62.40
Vesting period	3 years		3 years
Employee Stock Option [Member]
Number of Options
Balance at the beginning of the period (in shares)	1.6	1.6	1.6
Granted (in shares)	0
Exercised (in shares)	-0.1	-0.1
Cancelled (in shares)	0	-0.1
Balance at the end of the period (in shares)	1.5	1.4
Vested and expected to vest in the future at the end of the period (in shares)	1.5	1.4
Stock options, Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$27.69	$24.73	$24.73
Granted (in dollars per share)	$0
Exercised (in dollars per share)	$26.24	$17.23
Cancelled (in dollars per share)	$27.55	$26.74
Balance at the end of the period (in dollars per share)	$27.75	$25.15
Vested and expected to vest in the future at the end of the period (in dollars per share)	$27.75	$25.15
Performance Earnings Program [Member]
Compensation expense
Vesting period	3 years
Weighted average grant-date fair value of stock options granted (in dollars per share)	$32.38	$29.22
Restricted Stock Units (RSUs) [Member]
Compensation expense
Weighted average grant-date fair value of stock options granted (in dollars per share)	$31.06	$29.19

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Taxes
Effective tax rate (as a percent)	20.30%	29.30%
Federal statutory rate (as a percent)	35.00%
Discrete benefit	$6
Discrete benefit, percentage	6.00%
Undistributed earnings related to foreign subsidiaries	$108.90

Earnings_Per_Share_Details

Earnings Per Share (Details)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share
Antidilutive potential common shares excluded in computation of diluted loss per share	2,000,000
Denominator for basic earnings per share (in shares)	141,892,000	96,302,000
Potential common shares (in shares)		1,300,000
Denominator for diluted earnings per share (in shares)	141,892,000	97,590,000

Other_Financial_Information_De

Other Financial Information (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014
Accrued expenses
Accrued salaries and benefits	$866,000,000	$400,600,000
Accrued contract costs	773,700,000	446,400,000
Other accrued expenses	214,600,000	117,600,000
Total accrued expenses	1,854,293,000	964,627,000
Accrued contract costs related to professional liability accruals	$244,800,000	$120,200,000

Reclassifications_out_of_Accum1

Reclassifications out of Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated balances
Balance at the beginning of the period	($356,602,000)	($261,300,000)
Other comprehensive income (loss) before reclassification	-121,300,000	-27,900,000
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax	1,800,000	1,500,000
Balance at the end of the period	-475,691,000	-287,200,000
Actuarial losses
Accumulated balances
Balance at the beginning of the period	-217,000,000	-192,800,000
Other comprehensive income (loss) before reclassification	6,200,000	-2,500,000
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax	1,800,000	1,500,000
Balance at the end of the period	-209,000,000	-193,800,000
Accumulated Translation Adjustment [Member]
Accumulated balances
Balance at the beginning of the period	-137,800,000	-66,400,000
Other comprehensive income (loss) before reclassification	-126,000,000	-25,200,000
Balance at the end of the period	-263,800,000	-91,600,000
Cash flow hedges
Accumulated balances
Balance at the beginning of the period	-1,800,000	-2,100,000
Other comprehensive income (loss) before reclassification	-1,500,000	-200,000
Amounts reclassified from accumulated other comprehensive loss, cash flow hedge losses, net of tax	400,000	500,000
Balance at the end of the period	($2,900,000)	($1,800,000)

Reclassifications_out_of_Accum2

Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Amounts Reclassified from Accumulated Other Comprehensive Loss
Income before income tax expense	($100,773)	$80,026
Income tax expense	20,443	-23,485
Net (loss) income	-80,330	56,541
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss
Income tax expense	-300	-300
Net (loss) income	400	500
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income [Member] | Interest Expense [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss
Income before income tax expense	700	800
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss
Income tax expense	-800	-600
Net (loss) income	1,800	1,500
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cost of Sales and General and Administrative Expense [Member]
Amounts Reclassified from Accumulated Other Comprehensive Loss
Income before income tax expense	$2,600	$2,100

Commitments_and_Contingencies_

Commitments and Contingencies (Details)

0 Months Ended

0 Months Ended

1 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

6 Months Ended

0 Months Ended

Jun. 17, 2014

Nov. 17, 2014

Dec. 31, 2014

Oct. 17, 2014

Dec. 31, 2014

Dec. 31, 2014

Dec. 31, 2014

Jan. 31, 2010

Dec. 06, 2014

Dec. 31, 2014

Sep. 30, 2006

Mar. 31, 2014

Jun. 17, 2014

AUD

URS Corporation

Standby Letters of Credit [Member]

USAID Egyptian Projects

DOE Deactivation Demolition And Removal Project Member

DOE Deactivation Demolition And Removal Project Member

DOE Deactivation Demolition And Removal Project Member

Canadian Pipeline Contract Member

Waste Isolation Pilot Plant Environmental Incidents Member

AECOM Australia [Member]

AECOM Australia [Member]

RCM applicants

Portigon AG

USD ($)

USD ($)

URS Corporation

URS Corporation

Department of Energy Member

Department of Energy Member

URS Corporation

URS Corporation

item

AUD

USD ($)

AUD

Washington Group International

Washington Group International

USD ($)

URS Corporation

Flint Energy Services Ltd Member

Nuclear Waste Partnership LLC Member

USD ($)

USD ($)

Washington Group International

CAD

USD ($)

item

USD ($)

project

Commitments and Contingencies

Contingency liability of general and professional liability insurance programs and for payment and performance guarantees

$443,800,000

Number of subcontractors

2

Number of projects failed to comply USAID regulations

5

Amount paid to federal government for the five completed and operational projects ( including damages and civil penalties)

373,000,000

Projects costs, minimum

146,000,000

106,000,000

106,000,000

Projects costs, maximum

146,000,000

Total project costs

300,000,000

Amount recovery ( including additional Fees)

103,000,000

Minimum cost to complete the project

100,000,000

Civil penalty Amount

17,700,000

Proceeds from initial public offering (IPO)

700,000,000

Bank loan

1,400,000,000

Number of initial public offering investors

770

Damages claimed by applicants

85,000,000

1,680,000,000

76,000,000

Securities acquired by investors

155,000,000

Amount agreed to pay fees and expenses

$900,000

Reportable_Segments1

Reportable Segments (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
	segment
Summarized financial information concerning the Company's reportable segments
Revenue	$4,186,035	$1,953,875
Gross profit	164,223	78,198
Equity in earnings of joint ventures	23,924	36,083
General and administrative expenses	-34,338	-23,845
Acquisition and integration expense	-138,463
Operating income	15,346	90,436
Gross profit as a % of revenue	3.90%	4.00%
Number of reportable segments	3
Total Assets	14,253,269		6,123,377
Corporate
Summarized financial information concerning the Company's reportable segments
General and administrative expenses	-34,300	-23,900
Acquisition and integration expense	-138,500
Operating income	-172,800	-23,900
Total Assets	552,700		365,000
Design and Consulting Services
Summarized financial information concerning the Company's reportable segments
Revenue	1,877,000	1,301,400
Gross profit	49,300	53,900
Equity in earnings of joint ventures	1,500	32,800
Operating income	50,800	86,700
Gross profit as a % of revenue	2.60%	4.10%
Total Assets	7,242,800		4,064,500
Construction Services
Summarized financial information concerning the Company's reportable segments
Revenue	1,530,400	428,700
Gross profit	52,900	4,100
Equity in earnings of joint ventures	5,900	1,400
Operating income	58,800	5,500
Gross profit as a % of revenue	3.50%	1.00%
Total Assets	3,205,500		1,256,400
Management Services
Summarized financial information concerning the Company's reportable segments
Revenue	778,600	223,800
Gross profit	62,000	20,200
Equity in earnings of joint ventures	16,500	1,900
Operating income	78,500	22,100
Gross profit as a % of revenue	8.00%	9.00%
Total Assets	$3,252,300		$437,500