AECOM (ACM) 10-Q 6 Aug 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Jun. 30, 2014	Jul. 24, 2014
Document and Entity Information	'	'
Entity Registrant Name	'AECOM TECHNOLOGY CORP	'
Entity Central Index Key	'0000868857	'
Document Type	'10-Q	'
Document Period End Date	30-Jun-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--09-30	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	99,479,685
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Sep. 30, 2013
In Thousands, unless otherwise specified
CURRENT ASSETS:	'	'
Cash and cash equivalents	$419,248	$450,328
Cash in consolidated joint ventures	90,899	150,349
Total cash and cash equivalents	510,147	600,677
Accounts receivable-net	2,431,517	2,342,262
Prepaid expenses and other current assets	150,842	168,714
Income taxes receivable	9,355	'
Deferred tax assets-net	19,949	19,949
TOTAL CURRENT ASSETS	3,121,810	3,131,602
PROPERTY AND EQUIPMENT-NET	278,780	270,672
DEFERRED TAX ASSETS-NET	117,090	143,478
INVESTMENTS IN UNCONSOLIDATED JOINT VENTURES	133,766	106,422
GOODWILL	1,896,371	1,811,754
INTANGIBLE ASSETS-NET	86,717	83,149
OTHER NON-CURRENT ASSETS	119,208	118,546
TOTAL ASSETS	5,753,742	5,665,623
CURRENT LIABILITIES:	'	'
Short-term debt	27,922	29,578
Accounts payable	704,981	725,389
Accrued expenses and other current liabilities	930,693	915,282
Income taxes payable	'	6,127
Billings in excess of costs on uncompleted contracts	351,724	322,486
Current portion of long-term debt	38,540	54,687
TOTAL CURRENT LIABILITIES	2,053,860	2,053,549
OTHER LONG-TERM LIABILITIES	439,446	448,920
LONG-TERM DEBT	976,963	1,089,060
TOTAL LIABILITIES	3,470,269	3,591,529
COMMITMENTS AND CONTINGENCIES (Note 16)	'	'
AECOM STOCKHOLDERS' EQUITY:	'	'
Preferred stock, Class E-authorized, 20 shares; issued and outstanding, 1 and 2 shares as of June 30, 2014 and September 30, 2013, respectively; no par value, $1.00 liquidation preference value	'	'
Common stock-authorized, 300,000,000 shares of $0.01 par value as of June 30, 2014 and September 30, 2013; issued and outstanding 96,405,640 and 96,016,358 shares as of June 30, 2014 and September 30, 2013, respectively	964	960
Additional paid-in capital	1,848,344	1,809,627
Accumulated other comprehensive loss	-264,951	-261,299
Retained earnings	613,155	472,155
TOTAL AECOM STOCKHOLDERS' EQUITY	2,197,512	2,021,443
Noncontrolling interests	85,961	52,651
TOTAL STOCKHOLDERS' EQUITY	2,283,473	2,074,094
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$5,753,742	$5,665,623

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Sep. 30, 2013
Consolidated Balance Sheets	'	'
Preferred stock, authorized shares	20	20
Preferred stock, issued shares	1	2
Preferred stock, outstanding shares	1	2
Preferred stock, par value (in dollars per share)	'	'
Preferred stock, liquidation preference value (in dollars per share)	$1	$1
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	96,405,640	96,016,358
Common stock, outstanding shares	96,405,640	96,016,358

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Statements of Income	'	'	'	'
Revenue	$1,968,155	$2,067,490	$5,794,254	$6,074,408
Cost of revenue	1,859,615	1,935,676	5,520,109	5,764,633
Gross profit	108,540	131,814	274,145	309,775
Equity in earnings of joint ventures	5,896	4,094	49,415	17,855
General and administrative expenses	-22,904	-24,010	-73,198	-73,365
Income from operations	91,532	111,898	250,362	254,265
Other income	1,034	1,215	856	2,042
Interest expense	-9,797	-11,719	-30,722	-34,495
Income before income tax expense	82,769	101,394	220,496	221,812
Income tax expense	13,677	30,179	52,367	56,843
Net income	69,092	71,215	168,129	164,969
Noncontrolling interests in income of consolidated subsidiaries, net of tax	148	-460	-2,301	-2,294
Net income attributable to AECOM	$69,240	$70,755	$165,828	$162,675
Net income attributable to AECOM per share:	'	'	'	'
Basic (in dollars per share)	$0.71	$0.71	$1.71	$1.60
Diluted (in dollars per share)	$0.70	$0.70	$1.69	$1.58
Weighted average shares outstanding:	'	'	'	'
Basic (in shares)	97,483	99,257	96,933	101,482
Diluted (in shares)	98,956	100,761	98,295	102,706

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Consolidated Statements of Comprehensive Income	'	'	'	'
Net income	$69,092	$71,215	$168,129	$164,969
Unrealized gain (loss) on derivatives:	'	'	'	'
Unrealized holding (loss) gain on derivatives	-1,749	258	-1,944	262
Reclassification adjustments for losses included in net income	411	478	1,300	1,372
Net unrealized gain (loss) on derivatives, net of tax	-1,338	736	-644	1,634
Foreign currency translation adjustments	22,406	-63,404	-1,231	-98,282
Pension adjustments, net of tax	-1,745	445	-2,351	4,991
Other comprehensive income (loss), net of tax	19,323	-62,223	-4,226	-91,657
Comprehensive income, net of tax	88,415	8,992	163,903	73,312
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax	140	-460	-1,727	-2,294
Comprehensive income attributable to AECOM, net of tax	$88,555	$8,532	$162,176	$71,018

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:	'	'
Net income	$168,129	$164,969
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	70,470	71,371
Equity in earnings of unconsolidated joint ventures	-49,415	-17,855
Distribution of earnings from unconsolidated joint ventures	18,194	21,273
Non-cash stock compensation	25,986	27,404
Excess tax benefit from share-based payment	-626	-1,754
Foreign currency translation	1,933	-29,425
Other	2,840	1,988
Changes in operating assets and liabilities, net of effects of acquisitions:	'	'
Accounts receivable	-23,675	95,452
Prepaid expenses and other assets	-1,110	-18,259
Accounts payable	-31,246	-61,786
Accrued expenses and other current liabilities	11,020	41,247
Billings in excess of costs on uncompleted contracts	12,234	-11,280
Other long-term liabilities	-12,469	-27,375
Income taxes payable	-6,556	-7,519
Net cash provided by operating activities	185,709	248,451
CASH FLOWS FROM INVESTING ACTIVITIES:	'	'
Payments for business acquisitions, net of cash acquired	-659	-37,269
Cash acquired from consolidation of joint venture	18,955	'
Net investment in unconsolidated joint ventures	-50,395	-17,914
Sales (purchases) of investments	2,871	-20,169
Payments for capital expenditures	-49,578	-37,067
Other	'	2,724
Net cash used in investing activities	-78,806	-109,695
CASH FLOWS FROM FINANCING ACTIVITIES:	'	'
Proceeds from borrowings under credit agreements	1,398,528	1,847,723
Repayments of borrowings under credit agreements	-1,547,557	-1,748,366
Proceeds from issuance of common stock	9,793	11,801
Proceeds from exercise of stock options	9,077	10,509
Payments to repurchase common stock under the Repurchase Program	-28,141	-314,144
Payments for other repurchases of common stock	-6,436	-8,000
Excess tax benefit from share-based payment	626	1,754
Net distributions to noncontrolling interests	-28,779	-13,556
Net cash used in financing activities	-192,889	-212,279
EFFECT OF EXCHANGE RATE CHANGES ON CASH	-4,544	-12,662
NET DECREASE IN CASH AND CASH EQUIVALENTS	-90,530	-86,185
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	600,677	593,776
CASH AND CASH EQUIVALENTS AT END OF PERIOD	510,147	507,591
NON-CASH INVESTING AND FINANCING ACTIVITY	'	'
Common stock issued in acquisitions	'	$14,322

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Jun. 30, 2014
Basis of Presentation	'
Basis of Presentation	'
	1.              Basis of Presentation
	The accompanying consolidated financial statements of AECOM Technology Corporation (AECOM or 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, 2013. 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 reclassifications were made to the prior year to conform to current year presentation.
	The results of operations for the nine months ended June 30, 2014 are not necessarily indicative of the results to be expected for the fiscal year ending September 30, 2014.
	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	9 Months Ended
	Jun. 30, 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 to update the presentation of reclassifications from comprehensive income to net income in consolidated financial statements. Under this new guidance, an entity is required to present information about the amounts reclassified out of accumulated other comprehensive income either by the respective line items of net income or by cross-reference to other required disclosures. The new guidance does not change the requirements for reporting net income or other comprehensive income in financial statements. This guidance was effective for the Company’s fiscal year beginning October 1, 2013 and did not have a material impact on the Company’s consolidated financial statements.
	In February 2013, the 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 is effective for the Company’s fiscal year beginning October 1, 2014 and it is not expected to 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 is effective for the Company’s fiscal year beginning October 1, 2014 and it is not expected to 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 is currently in the process of evaluating the impact of adoption of the new accounting guidance on its consolidated financial statements.

Stock_Repurchase_Program

Stock Repurchase Program	9 Months Ended
	Jun. 30, 2014
Stock Repurchase Program	'
Stock Repurchase Program	'
	3.              Stock Repurchase Program
	The Company’s Board of Directors have authorized a stock repurchase program (the Repurchase Program), the dollar value capacity of which has been authorized as follows:
	Authorization Date	Increase in the		Maximum Dollar
		Dollar		Value Capacity at the
		Value Capacity		Authorization Date
		(amounts in millions)
	August 2011	$	200	$	200
	August 2012	$	300	$	500
	January 2013	$	500	$	1,000.00
	Share repurchases under the Repurchase Program can be made through open market purchases or other methods, including pursuant to a Rule 10b5-1 plan. The Company has purchased a total of 27.4 million shares at an average price of $24.10 per share, for a total cost of $660.1 million. As of June 30, 2014, $339.9 million was available for the repurchase of the Company’s common stock pursuant to the Repurchase Program. Repurchased shares are returned to treasury status, but remain authorized for registration and issuance in the future.
	Accelerated Share Repurchase
	In connection with the Repurchase Program, the Company entered into an agreement with a bank to repurchase 4.8 million shares for $100 million. The share repurchases occurred primarily in the quarter ended September 30, 2011.
	Rule 10b5-1 Repurchase Plan and Open Market Purchases
	In connection with the Repurchase Program, the Company has also repurchased a total of 22.6 million shares at an average price of $24.75 per share, for a total cost of $560.1 million.

Business_Acquisitions_Goodwill

Business Acquisitions, Goodwill and Intangible Assets	9 Months Ended
	Jun. 30, 2014
Business Acquisitions, Goodwill and Intangible Assets	'
Business Acquisitions, Goodwill and Intangible Assets	'
	4.              Business Acquisitions, Goodwill and Intangible Assets
	The Company obtained control of an unconsolidated joint venture that resulted in its consolidation during the nine months ended June 30, 2014, as further discussed in Note 6. No other business acquisitions occurred during the nine months ended June 30, 2014.
	At the time of acquisition, the Company preliminarily estimates the amount of the identifiable intangible assets acquired based upon historical valuations of similar acquisitions and the facts and circumstances available at the time. The Company determines the final value of the identifiable intangible assets as soon as information is available, but not more than 12 months from the date of acquisition. Post-acquisition adjustments primarily relate to project related liabilities.
	The changes in the carrying value of goodwill by reportable segment for the nine months ended June 30, 2014 and 2013 were as follows:
		September 30,		Post-			Foreign			Acquired		June 30, 2014
		2013		Acquisition			Exchange
				Adjustments			Impact
		(in millions)
	Professional Technical Services	$	1,645.00	$	5		$	0.4		$	79.2	$	1,729.60
	Management Support Services	166.8		—			—			—		166.8
	Total	$	1,811.80	$	5		$	0.4		$	79.2	$	1,896.40
		September 30,		Post-			Foreign			Acquired		June 30, 2013
		2012		Acquisition			Exchange
				Adjustments			Impact
		(in millions)
	Professional Technical Services	$	1,608.60	$	—		$	(43.4	)	$	65.3	$	1,630.50
	Management Support Services	166.8		—			—			—		166.8
	Total	$	1,775.40	$	—		$	(43.4	)	$	65.3	$	1,797.30
	The gross amounts and accumulated amortization of the Company’s acquired identifiable intangible assets with finite useful lives as of June 30, 2014 and September 30, 2013, included in intangible assets—net, in the accompanying consolidated balance sheets, were as follows:
		June 30, 2014								September 30, 2013
		Gross		Accumulated			Intangible			Gross		Accumulated			Intangible		Amortization
		Amount		Amortization			Assets, Net			Amount		Amortization			Assets, Net		Period
		(in millions)															(years)
	Backlog	$	104.3	$	(95.0	)	$	9.3		$	94.9	$	(89.4	)	$	5.5	1 – 5
	Customer relationships	158.6		(81.2		)	77.4			147.1		(69.5		)	77.6		10
	Trademark / tradename	7.8		(7.8		)	—			7.8		(7.8		)	—		2
	Total	$	270.7	$	(184.0	)	$	86.7		$	249.8	$	(166.7	)	$	83.1
	Amortization expense of acquired intangible assets included within cost of revenue was $17.3 million and $16.1 million for the nine months ended June 30, 2014 and 2013, respectively. The following table presents estimated amortization expense of intangible assets for the remainder of fiscal 2014 and for the succeeding years:
	Fiscal Year	(in millions)
	2014 (three months remaining)	$	5.7
	2015	21.7
	2016	15.5
	2017	13
	2018	9.7
	Thereafter	21.1
	Total	$	86.7

Accounts_ReceivableNet

Accounts Receivable-Net	9 Months Ended
	Jun. 30, 2014
Accounts Receivable-Net	'
Accounts Receivable-Net	'
	5.              Accounts Receivable—Net
	Net accounts receivable consisted of the following as of June 30, 2014 and September 30, 2013:
		June 30,			September 30,
		2014			2013
		(in millions)
	Billed	$	1,083.60		$	1,177.60
	Unbilled	1,240.20			1,076.80
	Contract retentions	180			174.3
	Total accounts receivable—gross	2,503.80			2,428.70
	Allowance for doubtful accounts	(72.3		)	(86.4		)
	Total accounts receivable—net	$	2,431.50		$	2,342.30
	Billed accounts receivable represent amounts billed to clients that have yet to be collected. Unbilled accounts receivable represent revenue recognized but not yet billed pursuant to contract terms or accounts billed after the period end. Substantially all unbilled receivables as of June 30, 2014 and September 30, 2013 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 June 30, 2014 or September 30, 2013.
	The Company has sold trade receivables to financial institutions, of which $116.1 million and $100.2 million was outstanding as of June 30, 2014 and September 30, 2013, 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	9 Months Ended
	Jun. 30, 2014
Joint Ventures and Variable Interest Entities	'
Joint Ventures and Variable Interest Entities	'
	6.              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 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 joint ventures of this type, 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.
	The Company has not provided financial or other support during the periods presented to any of its VIEs that it was not previously contractually required to provide. 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:
		June 30,		September 30,
		2014		2013
		(in millions)
	Current assets	$	236.2	$	185.7
	Non-current assets	109.3		—
	Total assets	$	345.5	$	185.7
	Current liabilities	$	172.1	$	38.9
	Non-current liabilities	—		—
	Total liabilities	172.1		38.9
	Total AECOM equity	99.5		106.8
	Noncontrolling interests	73.9		40
	Total owners’ equity	173.4		146.8
	Total liabilities and owners’ equity	$	345.5	$	185.7
	Total revenue of the consolidated joint ventures was $380.2 million and $392.6 million for the nine months ended June 30, 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:
		June 30,		September 30,
		2014		2013
		(in millions)
	Current assets	$	435.8	$	525.5
	Non-current assets	244.8		98.7
	Total assets	$	680.6	$	624.2
	Current liabilities	$	337.8	$	384.1
	Non-current liabilities	48.3		17.5
	Total liabilities	386.1		401.6
	Joint venturers’ equity	294.5		222.6
	Total liabilities and joint venturers’ equity	$	680.6	$	624.2
	AECOM’s investment in joint ventures	$	133.8	$	106.4
	Total revenue of the unconsolidated joint ventures was $1,455.3 million and $1,504.6 million for the nine months ended June 30, 2014 and 2013, respectively. Total gross profit, which also equates to net income, of the unconsolidated joint ventures was $39.1 million and $49.5 million for the nine months ended June 30, 2014 and 2013, respectively.
	Summary of AECOM’s equity in earnings of unconsolidated joint ventures is as follows:
		Nine Months Ended
		June 30, 2014		June 30, 2013
		(in millions)
	Pass through joint ventures	$	5.5	$	4.8
	Other joint ventures	44		13.1
	Total	$	49.5	$	17.9
	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 nine months ended June 30, 2014. 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 the acquisition date were $207.8 million and $48.1 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 PTS segment.

Pension_Benefit_Obligations

Pension Benefit Obligations	9 Months Ended
	Jun. 30, 2014
Pension Benefit Obligations	'
Pension Benefit Obligations	'
	7.              Pension Benefit Obligations
	The following table details the components of net periodic cost for the Company’s pension plans for the three and nine months ended June 30, 2014 and 2013:
		Three Months Ended												Nine months Ended
		June 30, 2014						June 30, 2013						June 30, 2014						June 30, 2013
		U.S.			Int’l			U.S.			Int’l			U.S.			Int’l			U.S.			Int’l
		(in millions)
	Components of net periodic (benefit) cost:
	Service costs	$	—		$	0.2		$	—		$	0.2		$	—		$	0.5		$	—		$	0.7
	Interest cost on projected benefit obligation	1.9			7.1			1.7			5.9			5.7			20.8			5			18
	Expected return on plan assets	(2.1		)	(6.6		)	(2.1		)	(5.6		)	(6.3		)	(19.5		)	(6.4		)	(17.1		)
	Amortization of prior service costs	—			(0.1		)	—			—			—			(0.2		)	—			(0.1		)
	Amortization of net loss	1			1.2			1			0.9			3			3.7			3.2			2.9
	Settlement loss recognized	—			—			—			—			—			—			—			2.6
	Net periodic (benefit) cost	$	0.8		$	1.8		$	0.6		$	1.4		$	2.4		$	5.3		$	1.8		$	7
	The total amounts of employer contributions paid for the nine months ended June 30, 2014 were $3.6 million for U.S. plans and $12.3 million for non-U.S. plans. The expected remaining scheduled annual employer contributions for the fiscal year ending September 30, 2014 are $1.3 million for U.S. plans and $4.1 million for non-U.S. plans. Included in other long-term liabilities on the Company’s consolidated balance sheet are net pension liabilities of $184.8 million and $192.7 million as of June 30, 2014 and September 30, 2013, respectively.

Debt

Debt	9 Months Ended
	Jun. 30, 2014
Debt	'
Debt	'
	8.              Debt
	Debt consisted of the following:
		June 30,			September 30,
		2014			2013
		(in millions)
	Unsecured term credit agreement	$	750		$	750
	Unsecured senior notes	262.9			260.2
	Unsecured revolving credit facility	—			114.7
	Other debt	30.5			48.4
	Total debt	1,043.40			1,173.30
	Less: Current portion of debt and short-term borrowings	(66.5		)	(84.3		)
	Long-term debt, less current portion	$	976.9		$	1,089.00
	The following table presents, in millions, scheduled maturities of the Company’s debt as of June 30, 2014:
	Fiscal Year
	2014 (three months remaining)	$	66
	2015	38.7
	2016	38.1
	2017	37.7
	2018	600
	Thereafter	262.9
	Total	$	1,043.40
	Unsecured Term Credit Agreement
	In June 2013, the Company entered into a Second Amended and Restated Credit Agreement (Term Credit Agreement) with Bank of America, N.A., as administrative agent and a lender, and the other lenders party thereto. Pursuant to the Term Credit Agreement, the Company borrowed $750 million and may borrow up to an additional $100 million subject to certain conditions, including lender approval. The Company used approximately $675 million of the proceeds from the loans to repay indebtedness under its prior term loan facility. The loans under the Term Credit Agreement bear interest, at the Company’s option, at either the Base Rate (as defined in the Term Credit Agreement) plus an applicable margin or the Eurodollar Rate (as defined in the Term Credit Agreement) plus an applicable margin. The applicable margin for the Base Rate loans is a range of 0.125% to 1.250% and the applicable margin for Eurodollar Rate loans is a range of 1.125% to 2.250%, both based on the debt-to-earnings leverage ratio of the Company at the end of each fiscal quarter. For the nine months ended June 30, 2014 and 2013, the average interest rate of the Company’s term loan facility was 1.66% and 1.98%, respectively. Payments of the initial principal amount outstanding under the Term Credit Agreement are required on an annual basis beginning on June 30, 2014 with the final principal balance of $600 million due on June 7, 2018. The Company may, at its option, prepay the loans at any time, without penalty. The Company’s obligations under the Term Credit Agreement are guaranteed by certain subsidiaries of the Company pursuant to one or more subsidiary guarantees.
	Unsecured Senior Notes
	In July 2010, the Company issued $300 million of notes to private institutional investors. The notes consisted of $175.0 million of 5.43% Senior Notes, Series A, due July 2020 and $125.0 million of 1.00% Senior Discount Notes, Series B, due July 2022 for net proceeds of $249.8 million. The outstanding accreted balance of Series B Notes, which have an effective interest rate of 5.62%, was $87.9 million and $85.2 million at June 30, 2014 and September 30, 2013, respectively. The fair value of the Company’s unsecured senior notes was approximately $282.1 million and $269.4 million at June 30, 2014 and September 30, 2013, respectively. The Company calculated the fair values based on model-derived valuations using market observable inputs, which are Level 2 inputs under the accounting guidance. The Company’s obligations under the notes are guaranteed by certain subsidiaries of the Company pursuant to one or more subsidiary guarantees. The Company may, at its option, prepay the notes at any time at their called principal amount, together with any accrued and unpaid interest, plus a make-whole premium.
	Unsecured Revolving Credit Facility
	In January 2014, the Company entered into a Fourth Amended and Restated Credit Agreement (Revolving Credit Agreement), which provides for a borrowing capacity of $1.05 billion. The Revolving Credit Agreement expires January 29, 2019, and prior to this expiration date, principal amounts outstanding under the Revolving Credit Agreement may be repaid and reborrowed at the Company’s option without prepayment or penalty, subject to certain conditions including the absence of any event of default. The Company may request an increase in capacity of up to a total of $1.25 billion, subject to certain conditions including the absence of any event of default. The loans under the Revolving Credit Agreement may be borrowed in dollars or in certain foreign currencies and bear interest, at the Company’s option, at either the Base Rate (as defined in the Revolving Credit Agreement) plus an applicable margin or the Eurocurrency Rate (as defined in the Revolving Credit Agreement) plus an applicable margin. The applicable margin for the Base Rate loans is a range of 0.125% to 1.250% and the applicable margin for the Eurocurrency Rate loans is a range of 1.125% to 2.250%, both based on the Company’s debt-to-earnings leverage ratio at the end of each fiscal quarter. In addition to these borrowing rates, there is a commitment fee which ranges from 0.125% to 0.350% on any unused commitment. At June 30, 2014 and September 30, 2013, $0.0 million and $114.7 million, respectively, were outstanding under the Company’s revolving credit facility. At June 30, 2014 and September 30, 2013, outstanding standby letters of credit totaled $9.5 million and $35.5 million, respectively, under the revolving credit facility. As of June 30, 2014, the Company had $1,040.5 million available under its Revolving Credit Agreement.
	Covenants and Restrictions
	Under the Company’s debt agreements relating to its unsecured revolving credit facility, unsecured term credit agreement, and unsecured senior notes, the Company is subject to a maximum consolidated leverage ratio at the end of each fiscal quarter. This ratio is calculated by dividing consolidated funded debt (including financial letters of credit and other adjustments per the Company’s debt agreements) by consolidated earnings before interest, taxes, depreciation, and amortization (EBITDA). Subject to certain differences among the Company’s debt agreements, EBITDA is defined as consolidated net income attributable to AECOM plus interest, depreciation and amortization expense, amounts set aside for taxes and other non-cash items (including a calculated annualized EBITDA from acquisitions). As of June 30, 2014, the Company’s most restrictive consolidated leverage ratio under its debt agreements was 2.54, which did not exceed the Company’s maximum consolidated leverage ratio permitted under the Company’s debt agreements of 3.0.
	The Company’s Revolving Credit Agreement and Term Credit Agreement also contain certain covenants that limit the Company’s ability to, among other things, (i) merge with other entities, (ii) enter into a transaction resulting in a change of control, (iii) create new liens, (iv) sell assets outside of the ordinary course of business, (v) enter into transactions with affiliates, (vi) substantially change the general nature of the Company and its subsidiaries taken as a whole, and (vii) incur indebtedness and contingent obligations.
	Additionally, the Company’s unsecured senior notes contain covenants that limit (i) certain types of indebtedness, which include indebtedness incurred by subsidiaries and indebtedness secured by a lien, (ii) merging with other entities, (iii) entering into a transaction resulting in a change of control, (iv) creating new liens, (v) selling assets outside of the ordinary course of business, (vi) entering into transactions with affiliates, and (vii) substantially changing the general nature of the Company and its subsidiaries taken as a whole. The unsecured senior notes also contain a financial covenant that requires the Company to maintain a net worth above a calculated threshold. The threshold is calculated as $1.2 billion plus 40% of the consolidated net income for each fiscal quarter commencing with the fiscal quarter ending June 30, 2010. In the calculation of this threshold, the Company cannot include a consolidated net loss that may occur in any fiscal quarter. The Company’s net worth for this financial covenant is defined as total AECOM stockholders’ equity, which is consolidated stockholders’ equity, including any redeemable common stock and stock units and the liquidation preference of any preferred stock. As of June 30, 2014, this amount was $2.2 billion, which exceeds the calculated threshold of $1.7 billion.
	Should the Company fail to comply with these covenants, all or a portion of its borrowings under the unsecured senior notes and unsecured term credit agreements could become immediately payable and its unsecured revolving credit facility could be terminated. At June 30, 2014 and September 30, 2013, the Company was in compliance with all such covenants.
	The Company’s average effective interest rate on total borrowings, including the effects of the interest rate swap agreements, during the nine months ended June 30, 2014 and 2013 was 2.8% and 3.0%, respectively.
	Other Debt
	Other debt consists primarily of bank overdrafts and obligations under capital leases and other unsecured credit facilities. In addition to the unsecured revolving credit facility discussed above, the Company also has other unsecured credit facilities primarily used for standby letters of credit issued for payment and performance guarantees. At June 30, 2014 and September 30, 2013, these outstanding standby letters of credit totaled $274.8 million and $236.4 million, respectively. As of June 30, 2014, the Company had $332.9 million available under these unsecured credit facilities.

Derivative_Financial_Instrumen

Derivative Financial Instruments	9 Months Ended
	Jun. 30, 2014
Derivative Financial Instruments	'
Derivative Financial Instruments	'
	9.              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 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 revenue 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 revenues 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:
	June 30, 2014
	Notional Amount			Fixed		Expiration
	(in millions)			Rate		Date
	$	300		1.63	%	June 2018
	250			0.95	%	September 2015
	200			0.68	%	December 2014
	September 30, 2013
	Notional Amount			Fixed		Expiration
	(in millions)			Rate		Date
	$	250		0.95	%	September 2015
	200			0.68	%	December 2014
	150			0.55	%	December 2013
	The notional principal of foreign currency options to purchase British Pounds (GBP) with Brazilian Reals (BRL) was BRL 1.1 million and BRL 2.1 million (or approximately $0.5 million and $0.9 million) at June 30, 2014 and September 30, 2013, respectively. These foreign exchange contracts have maturities of 12 months or less.
	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 $93.8 million and $171.8 million at June 30, 2014 and September 30, 2013, respectively. The notional principal of foreign currency forward contracts to sell U.S. dollars for foreign currencies was $59.9 million and $174.2 million at June 30, 2014 and September 30, 2013, respectively. The notional principal of foreign currency forward contracts to purchase GBP with BRL was BRL 4.0 million (or approximately $1.8 million) at September 30, 2013. There were no foreign currency forward contracts to purchase GBP with BRL at June 30, 2014. The notional principal of foreign currency forward contracts to sell GBP for BRL was BRL 4.1 million and BRL 8.2 million (or approximately $1.9 million and $3.6 million) at June 30, 2014 and September 30, 2013, 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 revenue. 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		Jun 30,			Sep 30,
					2014			2013
	Derivative assets
	Derivatives designated as hedging instruments:
	Foreign currency options		Prepaid expenses and other current assets		$	0.1		$	0.1
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts		Prepaid expenses and other current assets		1.5			1.6
	Total				$	1.6		$	1.7
	Derivative liabilities
	Derivatives designated as hedging instruments:
	Interest rate swap agreements		Accrued expenses and other current liabilities		$	4.3		$	2.6
	Interest rate swap agreements		Other long-term liabilities		0.4			1.1
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts		Accrued expenses and other current liabilities		0.8			1.5
	Total				$	5.5		$	5.2
	At June 30, 2014, the effective portion of the Company’s interest rate swap agreements designated as cash flow hedges before tax effect was $4.6 million, of which $4.3 million is expected to be reclassified from accumulated other comprehensive loss to interest expense within the next 12 months. At June 30, 2014, the effective portion of the Company’s foreign currency options designated as cash flow hedges before tax effect were immaterial.
	The effect of derivative instruments in cash flow hedging relationships on income and other comprehensive income is summarized below (in millions):
			Decrease/(Increase) in Losses						Decrease/(Increase) in Losses
			Recognized in Accumulated						Recognized in Accumulated
			Other Comprehensive Loss						Other Comprehensive Loss
			on Derivatives Before Tax						on Derivatives Before Tax
			Effect (Effective Portion)						Effect (Effective Portion)
			Three Months Ended June 30,						Nine Months Ended June 30,
			2014			2013			2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements		$	(2.9	)	$	0.4		$	(3.2	)	$	0.4
					Losses Reclassified from						Losses Reclassified from
					Accumulated Other						Accumulated Other
					Comprehensive Loss into						Comprehensive Loss into
					Income (Effective Portion)						Income (Effective Portion)
					Three Months Ended June 30,						Nine Months Ended June 30,
			Location		2014			2013			2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements		Interest expense		$	(0.7	)	$	(0.8	)	$	(2.3	)	$	(2.3	)
					Gains / (Losses) Recognized in						Gains / (Losses) Recognized in
					Income on Derivatives						Income on Derivatives
					(Amount Excluded from						(Amount Excluded from
Effectiveness Testing and					Effectiveness Testing and
Ineffective Portion)(1)					Ineffective Portion)(1)
Three Months Ended June 30,					Nine Months Ended June 30,
		Location		2014			2013			2014			2013
Derivatives in cash flow hedging relationship:
Foreign currency options		Cost of revenue		$	—		$	0.1		$	—		$	—
(1)         Losses related to the ineffective portion of the hedges were not material in all periods presented.
The gain recognized in accumulated other comprehensive loss from the Company’s foreign currency options was immaterial for the nine months ended June 30, 2014 and 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						Gains / (Losses) Recognized
				in Income on Derivatives						in Income on Derivatives
				(Amount Excluded from						(Amount Excluded from
				Effectiveness Testing and						Effectiveness Testing and
				Ineffective Portion) (1)						Ineffective Portion) (1)
				Three Months Ended June 30,						Nine Months Ended June 30,
		Location		2014			2013			2014			2013
Derivatives not designated as hedging instruments:
Foreign currency forward contracts		General and administrative expenses		$	0.6		$	(4.0	)	$	—		$	(3.9	)
Option contracts		Other income (expense)		—			0.1			—			(0.3		)
				$	0.6		$	(3.9	)	$	—		$	(4.2	)
(1)         Losses related to the ineffective portion of the hedges were not material in all periods presented.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Jun. 30, 2014
Fair Value Measurements	'
Fair Value Measurements	'
	10.       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 nine months ended June 30, 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:
		June 30,		Quoted Prices in
		2014		Active Markets for
				Identical Assets
				(Level 2)
	Foreign currency options	$	0.1	$	0.1
	Foreign currency forward contracts	1.5		1.5
	Total assets	$	1.6	$	1.6
	Interest rate swap agreements	$	4.7	$	4.7
	Foreign currency forward contracts	0.8		0.8
	Total liabilities	$	5.5	$	5.5
		September 30,		Quoted Prices in
		2013		Active Markets for
				Similar Assets
				(Level 2)
	Foreign currency options	$	0.1	$	0.1
	Foreign currency forward contracts	1.6		1.6
	Total assets	$	1.7	$	1.7
	Interest rate swap agreements	$	3.7	$	3.7
	Foreign currency forward contracts	1.5		1.5
	Total liabilities	$	5.2	$	5.2

Sharebased_Payments

Share-based Payments	9 Months Ended
	Jun. 30, 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.
	Stock option activity for the nine months ended June 30 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, prior year	1.6		$	24.73	2.5		$	22.81
	Options granted	0.6		31.62		—		—
	Options exercised	(0.4	)	22.99		(0.6	)	17.55
	Options forfeited or expired	(0.1	)	26.86		(0.2	)	26.95
	Outstanding at June 30	1.7		27.57		1.7		24.32
	Vested and expected to vest in the future as of June 30	1.7		$	27.57	1.7		$	24.32
	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 over a two or three-year period. Additionally, the Company issues restricted stock units to employees which are earned based on service conditions. Total compensation expense related to share-based payments was $26.0 million and $27.4 million during the nine months ended June 30, 2014 and 2013, respectively. Unrecognized compensation expense related to total share-based payments outstanding was $68.9 million and $52.6 million as of June 30, 2014 and September 30, 2013, 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 $0.6 million and $1.8 million for the nine months ended June 30, 2014 and 2013, respectively, have been classified as financing cash inflows in the consolidated statements of cash flows.

Income_Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2014
Income Taxes	'
Income Taxes	'
	12.      Income Taxes
	The Company’s effective tax rate was 23.7% and 25.6% for the nine months ended June 30, 2014 and 2013, respectively. The Company’s effective tax rate is lower than the federal statutory rate of 35.0% primarily due to the tax rate differential on foreign earnings where the statutory rates are generally lower than the federal statutory rate. Our effective tax rate fluctuates from quarter to quarter due to several factors including the change in the mix of foreign and domestic earnings, tax law changes, outcomes of administrative audits, changes in our assessment of valuation allowances and other tax contingencies.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Jun. 30, 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.
	The following table sets forth a reconciliation of the denominators for basic and diluted earnings per share:
		Three Months Ended		Nine Months Ended
		June 30,	June 30,	June 30,	June 30,
		2014	2013	2014	2013
		(in millions)
	Denominator for basic earnings per share	97.5	99.3	96.9	101.5
	Potential common shares	1.5	1.5	1.4	1.2
	Denominator for diluted earnings per share	99	100.8	98.3	102.7
	EPS includes the effect of repurchased shares, which are discussed in Note 3 herein. For the nine months ended June 30, 2014 and 2013, options excluded from the calculation of potential common shares were not significant.

Other_Financial_Information

Other Financial Information	9 Months Ended
	Jun. 30, 2014
Other Financial Information	'
Other Financial Information	'
	14.       Other Financial Information
	Accrued expenses and other current liabilities consist of the following:
		June 30,		September 30,
		2014		2013
		(in millions)
	Accrued salaries and benefits	$	419.4	$	410.6
	Accrued contract costs	396.4		404.2
	Other accrued expenses	114.9		100.5
		$	930.7	$	915.3
	Accrued contract costs above include balances related to professional liability accruals of $117.7 million and $121.3 million as of June 30, 2014 and September 30, 2013, respectively. The remaining accrued contract costs primarily relate to costs for services provided by subcontractors and other non-employees.
	Other long-term liabilities consist of the following:
		June 30,		September 30,
		2014		2013
		(in millions)
	Pension liabilities (Note 7)	$	184.8	$	192.7
	Reserve for uncertain tax positions	58.2		60.2
	Other	196.4		196
		$	439.4	$	448.9

Reclassifications_out_of_Accum

Reclassifications out of Accumulated Other Comprehensive Loss	9 Months Ended
	Jun. 30, 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 and nine months ended June 30, 2014 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 March 31, 2014	$	(193.4	)	$	(89.4	)	$	(1.5	)	$	(284.3	)
	Other comprehensive income before reclassification	(3.3		)	22.3			(1.6		)	17.4
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax	1.5			—			—			1.5
	Cash flow hedge losses, net of tax	—			—			0.4			0.4
	Balances at June 30, 2014	$	(195.2	)	$	(67.1	)	$	(2.7	)	$	(265.0	)
		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	(6.9		)	(0.7		)	(1.9		)	(9.5		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax	4.5			—			—			4.5
	Cash flow hedge losses, net of tax	—			—			1.3			1.3
	Balances at June 30, 2014	$	(195.2	)	$	(67.1	)	$	(2.7	)	$	(265.0	)
	Accumulated Other Comprehensive Loss Components	Three Months			Nine Months
		Ended June 30,			Ended June 30,
		2014			2014
	Cash flow hedges(1)	$	0.7		$	2.3
	Taxes	(0.3		)	(1.0		)
	Cash flow hedges, net of tax	$	0.4		$	1.3
	Actuarial losses(2)	$	2.2		$	6.5
	Taxes	(0.7		)	(2.0		)
	Actuarial losses, net of tax	$	1.5		$	4.5
	(1)      This accumulated other comprehensive component is reclassified in Interest expense in our Consolidated Statements of Income. See Note 9, 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 7, Pension Benefit Obligations, for more information.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 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, 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 June 30, 2014, the Company was contingently liable in the amount of approximately $284.3 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. 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. On projects where the Company has additional exposure including for delay or consequential damages, the policy is to cap those damages in order to limit this exposure and, in any case, to cap the performance guarantees themselves. 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.
	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 their 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 (SPV) 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 SPV (and certain affiliated SPVs) went into insolvency administrations in February 2011.
	KordaMentha, the receivers for the SPV and certain affiliated 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).  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 is vigorously defending the claims brought against it. The likely resolution of these matters cannot be reasonably determined at this time.  However, if these matters are not resolved in AECOM Australia’s favor then, depending upon the outcomes, it could have a material adverse effect on the Company’s results of operations.
	Litigation Related to the Merger
	As discussed in Note 18, on July 11, 2014, we entered into a definitive merger agreement to acquire URS Corporation.  In connection with the merger, beginning on July 21, 2014, five putative class action lawsuits were filed in the Court of Chancery of the State of Delaware by purported URS Corporation stockholders: Falato v. URS Corp., et al., Case No. 9921; City of Atlanta Firefighters’ Pension Fund v. Creel, et al., Case No. 9924; Petroutson v. URS Corp., et al., Case No. 9938; Miller v. URS Corp., et al., Case No. 9939; and Oklahoma Police Pension & Retirement System v. Creel, et al., Case No. 9975. The actions name as defendants URS Corporation, the members of the URS Corporation board of directors, AECOM, and two merger subsidiaries of AECOM formed for purposes of effecting the merger. Two of the actions also names as a defendant JANA Partners LLC. The complaints allege, among other things, that AECOM and its merger subsidiaries aided and abetted alleged breaches of fiduciary duties by URS Corporation and its board of directors. The complaints seek, among other relief, class certification, preliminary and permanent injunctive relief, and damages. AECOM believe the lawsuits are without merit and intends to defend vigorously against them.

Reportable_Segments

Reportable Segments	9 Months Ended
	Jun. 30, 2014
Reportable Segments	'
Reportable Segments	'
	17.       Reportable Segments
	The Company’s operations are organized into two reportable segments: Professional Technical Services (PTS) and Management Support Services (MSS). The Company’s PTS reportable segment delivers planning, consulting, architectural and engineering design, and program and construction management services to commercial and government clients worldwide. The Company’s MSS 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 PTS reportable segment 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.
	Management internally analyzes the results of its operations using several non-GAAP measures. A significant portion of the Company’s revenues relates to services provided by subcontractors and other non-employees that it categorizes as other direct costs. Other direct costs are segregated from cost of revenues resulting in revenue, net of other direct costs, which is a measure of work performed by Company employees. The Company has included information on revenue, net of other direct costs, as it believes that it is useful to view its revenue exclusive of costs associated with external service providers.
	The following tables set forth summarized financial information concerning the Company’s reportable segments:
	Reportable Segments:	Professional			Management			Corporate			Total
		Technical			Support
		Services			Services
		(in millions)
	Three Months Ended June 30, 2014:
	Revenue	$	1,794.60		$	173.6		$	—		$	1,968.20
	Revenue, net of other direct costs(1)	1,112.00			92.7			—			1,204.70
	Gross profit	99.5			9			—			108.5
	Equity in earnings of joint ventures	2.1			3.9			—			6
	General and administrative expenses	—			—			(22.9		)	(22.9		)
	Operating income	101.6			12.9			(22.9		)	91.6
	Gross profit as a % of revenue	5.5		%	5.2		%	—			5.5		%
	Gross profit as a % of revenue, net of other direct costs(1)	8.9		%	9.7		%	—			9		%
	Three Months Ended June 30, 2013:
	Revenue	$	1,847.10		$	220.4		$	—		$	2,067.50
	Revenue, net of other direct costs(1)	1,102.00			134			—			1,236.00
	Gross profit	119.8			12			—			131.8
	Equity in earnings of joint ventures	1			3.1			—			4.1
	General and administrative expenses	¾			¾			(24.0		)	(24.0		)
	Operating income	120.8			15.1			(24.0		)	111.9
	Gross profit as a % of revenue	6.5		%	5.4		%	—			6.4		%
	Gross profit as a % of revenue, net of other direct costs(1)	10.9		%	9		%	—			10.7		%
	Reportable Segments:	Professional			Management			Corporate			Total
		Technical			Support
		Services			Services
		(in millions)
	Nine Months Ended June 30, 2014:
	Revenue	$	5,248.40		$	545.9		$	—		$	5,794.30
	Revenue, net of other direct costs(1)	3,241.70			294.7			—			3,536.40
	Gross profit	244.7			29.4			—			274.1
	Equity in earnings of joint ventures	36.5			13			—			49.5
	General and administrative expenses	—			—			(73.2		)	(73.2		)
	Operating income	281.2			42.4			(73.2		)	250.4
	Gross profit as a % of revenue	4.7		%	5.4		%	—			4.7		%
	Gross profit as a % of revenue, net of other direct costs(1)	7.5		%	10		%	—			7.8		%
	Nine Months Ended June 30, 2013:
	Revenue	$	5,384.20		$	690.2		$	—		$	6,074.40
	Revenue, net of other direct costs(1)	3,306.10			426.8			—			3,732.90
	Gross profit	281.3			28.5			—			309.8
	Equity in earnings of joint ventures	10.3			7.6			—			17.9
	General and administrative expenses	¾			¾			(73.4		)	(73.4		)
	Operating income	291.6			36.1			(73.4		)	254.3
	Gross profit as a % of revenue	5.2		%	4.1		%	—			5.1		%
	Gross profit as a % of revenue, net of other direct costs(1)	8.5		%	6.7		%	—			8.3		%
	(1)                  Non-GAAP measure.

Subsequent_Events

Subsequent Events	9 Months Ended
	Jun. 30, 2014
Subsequent Events	'
Subsequent Events	'
	18.       Subsequent Events
	On July 11, 2014, the Company entered into a definitive merger agreement to acquire URS Corporation, a leading international provider of engineering, construction and technical services for approximately $4.0 billion. The acquisition is subject to customary closing conditions, including regulatory approvals, adoption of the definition merger agreement by URS stockholders and approval of the stock issuance proposal by AECOM stockholders.
	Both AECOM and URS may terminate the merger agreement under certain specified circumstances, including if the merger is not consummated on or before April 11, 2015 (or, if such date is extended pursuant to the terms of the merger agreement, if the merger is not consummated on or before July 11, 2015), if the approval of the AECOM or URS stockholders is not obtained, if there is a financing failure, if the other party’s board of directors makes an adverse recommendation change with respect to the proposed transaction, or to enter into a superior acquisition proposal.  In certain circumstances in connection with the termination of the merger agreement, including if AECOM’s board of directors changes or withdraws its recommendation of the stock issuance or terminates the merger agreement to enter into an agreement with respect to a superior proposal, AECOM must pay to URS a termination fee equal to $140 million, or $240 million if the merger agreement is terminated under circumstances where all closing conditions have been satisfied but AECOM’s debt financing is not available to complete the merger and AECOM fails to close the merger.  In certain circumstances in connection with the termination of the merger agreement, including if URS’s board of directors changes or withdraws its recommendation of the merger or terminates the merger agreement to enter into an agreement with respect to a superior proposal, URS must pay to AECOM a termination fee equal to $140 million. If the merger agreement is terminated by a party as a result of certain breaches by the other party, then the non-terminating party will be required to reimburse the terminating party for its reasonable out-of-pocket fees and expenses up to $40 million.
	On July 24, 2014, the Company acquired Hunt Construction Group, a commercial construction management firm which serves clients in both the public and private sectors.

Stock_Repurchase_Program_Table

Stock Repurchase Program (Tables)	9 Months Ended
	Jun. 30, 2014
Stock Repurchase Program	'
Schedule of the dollar value capacity of the Repurchase Program	'
	Authorization Date	Increase in the		Maximum Dollar
		Dollar		Value Capacity at the
		Value Capacity		Authorization Date
		(amounts in millions)
	August 2011	$	200	$	200
	August 2012	$	300	$	500
	January 2013	$	500	$	1,000.00

Business_Acquisitions_Goodwill1

Business Acquisitions, Goodwill and Intangible Assets (Tables)	9 Months Ended
	Jun. 30, 2014
Business Acquisitions, Goodwill and Intangible Assets	'
Schedule of changes in the carrying value of goodwill by reportable segment	'
		September 30,		Post-			Foreign			Acquired		June 30, 2014
		2013		Acquisition			Exchange
				Adjustments			Impact
		(in millions)
	Professional Technical Services	$	1,645.00	$	5		$	0.4		$	79.2	$	1,729.60
	Management Support Services	166.8		—			—			—		166.8
	Total	$	1,811.80	$	5		$	0.4		$	79.2	$	1,896.40
		September 30,		Post-			Foreign			Acquired		June 30, 2013
		2012		Acquisition			Exchange
				Adjustments			Impact
		(in millions)
	Professional Technical Services	$	1,608.60	$	—		$	(43.4	)	$	65.3	$	1,630.50
	Management Support Services	166.8		—			—			—		166.8
	Total	$	1,775.40	$	—		$	(43.4	)	$	65.3	$	1,797.30
Schedule of finite-lived intangible assets by major class	'
		June 30, 2014								September 30, 2013
		Gross		Accumulated			Intangible			Gross		Accumulated			Intangible		Amortization
		Amount		Amortization			Assets, Net			Amount		Amortization			Assets, Net		Period
		(in millions)															(years)
	Backlog	$	104.3	$	(95.0	)	$	9.3		$	94.9	$	(89.4	)	$	5.5	1 – 5
	Customer relationships	158.6		(81.2		)	77.4			147.1		(69.5		)	77.6		10
	Trademark / tradename	7.8		(7.8		)	—			7.8		(7.8		)	—		2
	Total	$	270.7	$	(184.0	)	$	86.7		$	249.8	$	(166.7	)	$	83.1
Schedule of estimated future amortization expense of intangible assets	'
	Fiscal Year	(in millions)
	2014 (three months remaining)	$	5.7
	2015	21.7
	2016	15.5
	2017	13
	2018	9.7
	Thereafter	21.1
	Total	$	86.7

Accounts_ReceivableNet_Tables

Accounts Receivable-Net (Tables)	9 Months Ended
	Jun. 30, 2014
Accounts Receivable-Net	'
Schedule of net accounts receivable	'
		June 30,			September 30,
		2014			2013
		(in millions)
	Billed	$	1,083.60		$	1,177.60
	Unbilled	1,240.20			1,076.80
	Contract retentions	180			174.3
	Total accounts receivable—gross	2,503.80			2,428.70
	Allowance for doubtful accounts	(72.3		)	(86.4		)
	Total accounts receivable—net	$	2,431.50		$	2,342.30

Joint_Ventures_and_Variable_In1

Joint Ventures and Variable Interest Entities (Tables)	9 Months Ended
	Jun. 30, 2014
Joint Ventures and Variable Interest Entities	'
Summary of unaudited financial information of the consolidated joint ventures	'
		June 30,		September 30,
		2014		2013
		(in millions)
	Current assets	$	236.2	$	185.7
	Non-current assets	109.3		—
	Total assets	$	345.5	$	185.7
	Current liabilities	$	172.1	$	38.9
	Non-current liabilities	—		—
	Total liabilities	172.1		38.9
	Total AECOM equity	99.5		106.8
	Noncontrolling interests	73.9		40
	Total owners’ equity	173.4		146.8
	Total liabilities and owners’ equity	$	345.5	$	185.7
Summary of unaudited financial information of the unconsolidated joint ventures	'
		June 30,		September 30,
		2014		2013
		(in millions)
	Current assets	$	435.8	$	525.5
	Non-current assets	244.8		98.7
	Total assets	$	680.6	$	624.2
	Current liabilities	$	337.8	$	384.1
	Non-current liabilities	48.3		17.5
	Total liabilities	386.1		401.6
	Joint venturers’ equity	294.5		222.6
	Total liabilities and joint venturers’ equity	$	680.6	$	624.2
	AECOM’s investment in joint ventures	$	133.8	$	106.4
Summary of AECOM's equity in earnings of unconsolidated joint ventures	'
		Nine Months Ended
		June 30, 2014		June 30, 2013
		(in millions)
	Pass through joint ventures	$	5.5	$	4.8
	Other joint ventures	44		13.1
	Total	$	49.5	$	17.9

Pension_Benefit_Obligations_Ta

Pension Benefit Obligations (Tables)	9 Months Ended
	Jun. 30, 2014
Pension Benefit Obligations	'
Components of net periodic cost for the Company's pension plans	'
		Three Months Ended												Nine months Ended
		June 30, 2014						June 30, 2013						June 30, 2014						June 30, 2013
		U.S.			Int’l			U.S.			Int’l			U.S.			Int’l			U.S.			Int’l
		(in millions)
	Components of net periodic (benefit) cost:
	Service costs	$	—		$	0.2		$	—		$	0.2		$	—		$	0.5		$	—		$	0.7
	Interest cost on projected benefit obligation	1.9			7.1			1.7			5.9			5.7			20.8			5			18
	Expected return on plan assets	(2.1		)	(6.6		)	(2.1		)	(5.6		)	(6.3		)	(19.5		)	(6.4		)	(17.1		)
	Amortization of prior service costs	—			(0.1		)	—			—			—			(0.2		)	—			(0.1		)
	Amortization of net loss	1			1.2			1			0.9			3			3.7			3.2			2.9
	Settlement loss recognized	—			—			—			—			—			—			—			2.6
	Net periodic (benefit) cost	$	0.8		$	1.8		$	0.6		$	1.4		$	2.4		$	5.3		$	1.8		$	7

Debt_Tables

Debt (Tables)	9 Months Ended
	Jun. 30, 2014
Debt	'
Schedule of debt	'
		June 30,			September 30,
		2014			2013
		(in millions)
	Unsecured term credit agreement	$	750		$	750
	Unsecured senior notes	262.9			260.2
	Unsecured revolving credit facility	—			114.7
	Other debt	30.5			48.4
	Total debt	1,043.40			1,173.30
	Less: Current portion of debt and short-term borrowings	(66.5		)	(84.3		)
	Long-term debt, less current portion	$	976.9		$	1,089.00
Schedule of maturities of debt	'
	Fiscal Year
	2014 (three months remaining)	$	66
	2015	38.7
	2016	38.1
	2017	37.7
	2018	600
	Thereafter	262.9
	Total	$	1,043.40

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	9 Months Ended
	Jun. 30, 2014
Derivative Financial Instruments	'
Notional principle, fixed rates and related expiration dates of outstanding interest rate swap agreements	'
	June 30, 2014
	Notional Amount			Fixed		Expiration
	(in millions)			Rate		Date
	$	300		1.63	%	June 2018
	250			0.95	%	September 2015
	200			0.68	%	December 2014
	September 30, 2013
	Notional Amount			Fixed		Expiration
	(in millions)			Rate		Date
	$	250		0.95	%	September 2015
	200			0.68	%	December 2014
	150			0.55	%	December 2013
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		Jun 30,			Sep 30,
					2014			2013
	Derivative assets
	Derivatives designated as hedging instruments:
	Foreign currency options		Prepaid expenses and other current assets		$	0.1		$	0.1
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts		Prepaid expenses and other current assets		1.5			1.6
	Total				$	1.6		$	1.7
	Derivative liabilities
	Derivatives designated as hedging instruments:
	Interest rate swap agreements		Accrued expenses and other current liabilities		$	4.3		$	2.6
	Interest rate swap agreements		Other long-term liabilities		0.4			1.1
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts		Accrued expenses and other current liabilities		0.8			1.5
	Total				$	5.5		$	5.2
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):
			Decrease/(Increase) in Losses						Decrease/(Increase) in Losses
			Recognized in Accumulated						Recognized in Accumulated
			Other Comprehensive Loss						Other Comprehensive Loss
			on Derivatives Before Tax						on Derivatives Before Tax
			Effect (Effective Portion)						Effect (Effective Portion)
			Three Months Ended June 30,						Nine Months Ended June 30,
			2014			2013			2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements		$	(2.9	)	$	0.4		$	(3.2	)	$	0.4
					Losses Reclassified from						Losses Reclassified from
					Accumulated Other						Accumulated Other
					Comprehensive Loss into						Comprehensive Loss into
					Income (Effective Portion)						Income (Effective Portion)
					Three Months Ended June 30,						Nine Months Ended June 30,
			Location		2014			2013			2014			2013
	Derivatives in cash flow hedging relationship:
	Interest rate swap agreements		Interest expense		$	(0.7	)	$	(0.8	)	$	(2.3	)	$	(2.3	)
					Gains / (Losses) Recognized in						Gains / (Losses) Recognized in
					Income on Derivatives						Income on Derivatives
					(Amount Excluded from						(Amount Excluded from
					Effectiveness Testing and						Effectiveness Testing and
					Ineffective Portion)(1)						Ineffective Portion)(1)
					Three Months Ended June 30,						Nine Months Ended June 30,
			Location		2014			2013			2014			2013
	Derivatives in cash flow hedging relationship:
	Foreign currency options		Cost of revenue		$	—		$	0.1		$	—		$	—
	(1)         Losses related to the ineffective portion of the hedges were not material in all periods presented.
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						Gains / (Losses) Recognized
					in Income on Derivatives						in Income on Derivatives
					(Amount Excluded from						(Amount Excluded from
					Effectiveness Testing and						Effectiveness Testing and
					Ineffective Portion) (1)						Ineffective Portion) (1)
					Three Months Ended June 30,						Nine Months Ended June 30,
			Location		2014			2013			2014			2013
	Derivatives not designated as hedging instruments:
	Foreign currency forward contracts		General and administrative expenses		$	0.6		$	(4.0	)	$	—		$	(3.9	)
	Option contracts		Other income (expense)		—			0.1			—			(0.3		)
					$	0.6		$	(3.9	)	$	—		$	(4.2	)
	(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)	9 Months Ended
	Jun. 30, 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:
		June 30,		Quoted Prices in
		2014		Active Markets for
				Identical Assets
				(Level 2)
	Foreign currency options	$	0.1	$	0.1
	Foreign currency forward contracts	1.5		1.5
	Total assets	$	1.6	$	1.6
	Interest rate swap agreements	$	4.7	$	4.7
	Foreign currency forward contracts	0.8		0.8
	Total liabilities	$	5.5	$	5.5
		September 30,		Quoted Prices in
		2013		Active Markets for
				Similar Assets
				(Level 2)
	Foreign currency options	$	0.1	$	0.1
	Foreign currency forward contracts	1.6		1.6
	Total assets	$	1.7	$	1.7
	Interest rate swap agreements	$	3.7	$	3.7
	Foreign currency forward contracts	1.5		1.5
	Total liabilities	$	5.2	$	5.2

Sharebased_Payments_Tables

Share-based Payments (Tables)	9 Months Ended
	Jun. 30, 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, prior year	1.6		$	24.73	2.5		$	22.81
	Options granted	0.6		31.62		—		—
	Options exercised	(0.4	)	22.99		(0.6	)	17.55
	Options forfeited or expired	(0.1	)	26.86		(0.2	)	26.95
	Outstanding at June 30	1.7		27.57		1.7		24.32
	Vested and expected to vest in the future as of June 30	1.7		$	27.57	1.7		$	24.32

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Jun. 30, 2014
Earnings Per Share	'
Reconciliation of the denominators for basic and diluted EPS	'
		Three Months Ended		Nine Months Ended
		June 30,	June 30,	June 30,	June 30,
		2014	2013	2014	2013
		(in millions)
	Denominator for basic earnings per share	97.5	99.3	96.9	101.5
	Potential common shares	1.5	1.5	1.4	1.2
	Denominator for diluted earnings per share	99	100.8	98.3	102.7

Other_Financial_Information_Ta

Other Financial Information (Tables)	9 Months Ended
	Jun. 30, 2014
Other Financial Information	'
Schedule of accrued expenses and other current liabilities	'
		June 30,		September 30,
		2014		2013
		(in millions)
	Accrued salaries and benefits	$	419.4	$	410.6
	Accrued contract costs	396.4		404.2
	Other accrued expenses	114.9		100.5
		$	930.7	$	915.3
Schedule of other long-term liabilities	'
		June 30,		September 30,
		2014		2013
		(in millions)
	Pension liabilities (Note 7)	$	184.8	$	192.7
	Reserve for uncertain tax positions	58.2		60.2
	Other	196.4		196
		$	439.4	$	448.9

Reclassifications_out_of_Accum1

Reclassifications out of Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Jun. 30, 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 and nine months ended June 30, 2014 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 March 31, 2014	$	(193.4	)	$	(89.4	)	$	(1.5	)	$	(284.3	)
	Other comprehensive income before reclassification	(3.3		)	22.3			(1.6		)	17.4
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax	1.5			—			—			1.5
	Cash flow hedge losses, net of tax	—			—			0.4			0.4
	Balances at June 30, 2014	$	(195.2	)	$	(67.1	)	$	(2.7	)	$	(265.0	)
		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	(6.9		)	(0.7		)	(1.9		)	(9.5		)
	Amounts reclassified from accumulated other comprehensive loss:
	Actuarial losses, net of tax	4.5			—			—			4.5
	Cash flow hedge losses, net of tax	—			—			1.3			1.3
	Balances at June 30, 2014	$	(195.2	)	$	(67.1	)	$	(2.7	)	$	(265.0	)
Schedule of amounts reclassified from accumulated other comprehensive loss	'
	Accumulated Other Comprehensive Loss Components	Three Months			Nine Months
		Ended June 30,			Ended June 30,
		2014			2014
	Cash flow hedges(1)	$	0.7		$	2.3
	Taxes	(0.3		)	(1.0		)
	Cash flow hedges, net of tax	$	0.4		$	1.3
	Actuarial losses(2)	$	2.2		$	6.5
	Taxes	(0.7		)	(2.0		)
	Actuarial losses, net of tax	$	1.5		$	4.5
	(1)      This accumulated other comprehensive component is reclassified in Interest expense in our Consolidated Statements of Income. See Note 9, 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 7, Pension Benefit Obligations, for more information.

Reportable_Segments_Tables

Reportable Segments (Tables)	9 Months Ended
	Jun. 30, 2014
Reportable Segments	'
Summarized financial information concerning the Company's reportable segments	'
	Reportable Segments:	Professional			Management			Corporate			Total
		Technical			Support
		Services			Services
		(in millions)
	Three Months Ended June 30, 2014:
	Revenue	$	1,794.60		$	173.6		$	—		$	1,968.20
	Revenue, net of other direct costs(1)	1,112.00			92.7			—			1,204.70
	Gross profit	99.5			9			—			108.5
	Equity in earnings of joint ventures	2.1			3.9			—			6
	General and administrative expenses	—			—			(22.9		)	(22.9		)
	Operating income	101.6			12.9			(22.9		)	91.6
	Gross profit as a % of revenue	5.5		%	5.2		%	—			5.5		%
	Gross profit as a % of revenue, net of other direct costs(1)	8.9		%	9.7		%	—			9		%
	Three Months Ended June 30, 2013:
	Revenue	$	1,847.10		$	220.4		$	—		$	2,067.50
	Revenue, net of other direct costs(1)	1,102.00			134			—			1,236.00
	Gross profit	119.8			12			—			131.8
	Equity in earnings of joint ventures	1			3.1			—			4.1
	General and administrative expenses	¾			¾			(24.0		)	(24.0		)
	Operating income	120.8			15.1			(24.0		)	111.9
	Gross profit as a % of revenue	6.5		%	5.4		%	—			6.4		%
	Gross profit as a % of revenue, net of other direct costs(1)	10.9		%	9		%	—			10.7		%
	Reportable Segments:	Professional			Management			Corporate			Total
		Technical			Support
		Services			Services
		(in millions)
	Nine Months Ended June 30, 2014:
	Revenue	$	5,248.40		$	545.9		$	—		$	5,794.30
	Revenue, net of other direct costs(1)	3,241.70			294.7			—			3,536.40
	Gross profit	244.7			29.4			—			274.1
	Equity in earnings of joint ventures	36.5			13			—			49.5
	General and administrative expenses	—			—			(73.2		)	(73.2		)
	Operating income	281.2			42.4			(73.2		)	250.4
	Gross profit as a % of revenue	4.7		%	5.4		%	—			4.7		%
	Gross profit as a % of revenue, net of other direct costs(1)	7.5		%	10		%	—			7.8		%
	Nine Months Ended June 30, 2013:
	Revenue	$	5,384.20		$	690.2		$	—		$	6,074.40
	Revenue, net of other direct costs(1)	3,306.10			426.8			—			3,732.90
	Gross profit	281.3			28.5			—			309.8
	Equity in earnings of joint ventures	10.3			7.6			—			17.9
	General and administrative expenses	¾			¾			(73.4		)	(73.4		)
	Operating income	291.6			36.1			(73.4		)	254.3
	Gross profit as a % of revenue	5.2		%	4.1		%	—			5.1		%
	Gross profit as a % of revenue, net of other direct costs(1)	8.5		%	6.7		%	—			8.3		%
	(1)                  Non-GAAP measure.

Basis_of_Presentation_Details

Basis of Presentation (Details)	9 Months Ended
	Jun. 30, 2014
Minimum	'
Length of fiscal year	'364 days
Maximum	'
Length of fiscal year	'371 days

Stock_Repurchase_Program_Detai

Stock Repurchase Program (Details) (USD $)	1 Months Ended			9 Months Ended	35 Months Ended	1 Months Ended				35 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jan. 31, 2013	Aug. 31, 2012	Aug. 31, 2011	Jun. 30, 2014	Jun. 30, 2014	Jan. 31, 2013	Aug. 31, 2012	Aug. 31, 2011	Sep. 30, 2011	Jun. 30, 2014
						Maximum	Maximum	Maximum	Accelerated Share Repurchase	Rule 10b5-1 Repurchase Plan and Open Market Purchases
Stock Repurchase Program	'	'	'	'	'	'	'	'	'	'
Stock repurchase additional authorized amount	$500	$300	$200	'	'	'	'	'	'	'
Number of shares authorized to be repurchased	'	'	'	'	'	'	'	'	4.8	'
Authorized amount of stock repurchase	'	'	'	'	'	1,000	500	200	100	'
Shares repurchased and retired under the agreement	'	'	'	'	27.4	'	'	'	'	22.6
Total cost of shares repurchased under the agreement	'	'	'	'	660.1	'	'	'	'	560.1
Remaining repurchase amount of shares pursuant to the plan	'	'	'	$339.90	'	'	'	'	'	'
Average price per share of stock repurchased under the agreement (in dollars per share)	'	'	'	'	$24.10	'	'	'	'	$24.75

Business_Acquisitions_Goodwill2

Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012
	item		Professional Technical Services	Professional Technical Services	Management Support Services	Management Support Services	Management Support Services	Management Support Services
Business Acquisitions, Goodwill and Intangible Assets	'	'	'	'	'	'	'	'
Number of business acquisitions	0	'	'	'	'	'	'	'
Maximum period to determine final value of identifiable intangible assets	'12 months	'	'	'	'	'	'	'
Changes in the carrying value of goodwill by reporting segment	'	'	'	'	'	'	'	'
Goodwill at the beginning of the period	$1,811,754,000	$1,775,400,000	$1,645,000,000	$1,608,600,000	$166,800,000	$166,800,000	$166,800,000	$166,800,000
Post-Acquisition Adjustments	5,000,000	'	5,000,000	'	'	'	'	'
Foreign Exchange Impact	400,000	-43,400,000	400,000	-43,400,000	'	'	'	'
Acquired	79,200,000	65,300,000	79,200,000	65,300,000	'	'	'	'
Goodwill at the end of the period	$1,896,371,000	$1,797,300,000	$1,729,600,000	$1,630,500,000	$166,800,000	$166,800,000	$166,800,000	$166,800,000

Business_Acquisitions_Goodwill3

Business Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $)	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Identifiable intangible assets with finite useful lives	'	'	'
Gross Amount	$270,700,000	'	$249,800,000
Accumulated Amortization	-184,000,000	'	-166,700,000
Intangible Assets, Net	86,717,000	'	83,149,000
Amortization expense	17,300,000	16,100,000	'
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years	'	'	'
2014 (three months remaining)	5,700,000	'	'
2015	21,700,000	'	'
2016	15,500,000	'	'
2017	13,000,000	'	'
2018	9,700,000	'	'
Thereafter	21,100,000	'	'
Intangible Assets, Net	86,717,000	'	83,149,000
Backlog	'	'	'
Identifiable intangible assets with finite useful lives	'	'	'
Gross Amount	104,300,000	'	94,900,000
Accumulated Amortization	-95,000,000	'	-89,400,000
Intangible Assets, Net	9,300,000	'	5,500,000
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years	'	'	'
Intangible Assets, Net	9,300,000	'	5,500,000
Backlog | Minimum	'	'	'
Identifiable intangible assets with finite useful lives	'	'	'
Amortization Period	'1 year	'	'
Backlog | Maximum	'	'	'
Identifiable intangible assets with finite useful lives	'	'	'
Amortization Period	'5 years	'	'
Customer relationships	'	'	'
Identifiable intangible assets with finite useful lives	'	'	'
Gross Amount	158,600,000	'	147,100,000
Accumulated Amortization	-81,200,000	'	-69,500,000
Intangible Assets, Net	77,400,000	'	77,600,000
Amortization Period	'10 years	'	'
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years	'	'	'
Intangible Assets, Net	77,400,000	'	77,600,000
Trademark / tradename	'	'	'
Identifiable intangible assets with finite useful lives	'	'	'
Gross Amount	7,800,000	'	7,800,000
Accumulated Amortization	($7,800,000)	'	($7,800,000)
Amortization Period	'2 years	'	'

Accounts_ReceivableNet_Details

Accounts Receivable-Net (Details) (USD $)	9 Months Ended	12 Months Ended
	Jun. 30, 2014	Sep. 30, 2013
Accounts Receivable-Net	'	'
Billed	$1,083,600,000	$1,177,600,000
Unbilled	1,240,200,000	1,076,800,000
Contract retentions	180,000,000	174,300,000
Total accounts receivable-gross	2,503,800,000	2,428,700,000
Allowance for doubtful accounts	-72,300,000	-86,400,000
Total accounts receivable -net	2,431,517,000	2,342,262,000
Period in which unbilled receivables are expected to be billed and collected	'12 months	'12 months
Sale of trade receivables, outstanding	$116,100,000	$100,200,000

Joint_Ventures_and_Variable_In2

Joint Ventures and Variable Interest Entities (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
	item		item
Financial information	'	'	'	'	'
Number of employees in some joint ventures	0	'	0	'	'
Current assets	$3,121,810,000	'	$3,121,810,000	'	$3,131,602,000
TOTAL ASSETS	5,753,742,000	'	5,753,742,000	'	5,665,623,000
Current liabilities	2,053,860,000	'	2,053,860,000	'	2,053,549,000
TOTAL LIABILITIES	3,470,269,000	'	3,470,269,000	'	3,591,529,000
Total AECOM equity	2,197,512,000	'	2,197,512,000	'	2,021,443,000
Noncontrolling interests	85,961,000	'	85,961,000	'	52,651,000
TOTAL STOCKHOLDERS' EQUITY	2,283,473,000	'	2,283,473,000	'	2,074,094,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	5,753,742,000	'	5,753,742,000	'	5,665,623,000
AECOM's investment in joint ventures	133,766,000	'	133,766,000	'	106,422,000
Joint ventures summarized financial information	'	'	'	'	'
Total revenue	1,968,155,000	2,067,490,000	5,794,254,000	6,074,408,000	'
Gross profit	108,540,000	131,814,000	274,145,000	309,775,000	'
Summary of AECOM's equity in earnings of unconsolidated joint ventures:	'	'	'	'	'
Total	5,896,000	4,094,000	49,415,000	17,855,000	'
Greater than or equal to	'	'	'	'	'
Financial information	'	'	'	'	'
Number of partners required to form joint ventures	2	'	2	'	'
Consolidated joint ventures	'	'	'	'	'
Financial information	'	'	'	'	'
Current assets	236,200,000	'	236,200,000	'	185,700,000
Non-current assets	109,300,000	'	109,300,000	'	'
TOTAL ASSETS	345,500,000	'	345,500,000	'	185,700,000
Current liabilities	172,100,000	'	172,100,000	'	38,900,000
TOTAL LIABILITIES	172,100,000	'	172,100,000	'	38,900,000
Total AECOM equity	99,500,000	'	99,500,000	'	106,800,000
Noncontrolling interests	73,900,000	'	73,900,000	'	40,000,000
TOTAL STOCKHOLDERS' EQUITY	173,400,000	'	173,400,000	'	146,800,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	345,500,000	'	345,500,000	'	185,700,000
Joint ventures summarized financial information	'	'	'	'	'
Total revenue	'	'	380,200,000	392,600,000	'
Consolidated joint venture during the quarter ended 06/30/2014	'	'	'	'	'
Financial information	'	'	'	'	'
TOTAL ASSETS	207,800,000	'	207,800,000	'	'
TOTAL LIABILITIES	48,100,000	'	48,100,000	'	'
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	'	58,000,000	'	'
Unconsolidated joint ventures	'	'	'	'	'
Financial information	'	'	'	'	'
Current assets	435,800,000	'	435,800,000	'	525,500,000
Non-current assets	244,800,000	'	244,800,000	'	98,700,000
TOTAL ASSETS	680,600,000	'	680,600,000	'	624,200,000
Current liabilities	337,800,000	'	337,800,000	'	384,100,000
Non-current liabilities	48,300,000	'	48,300,000	'	17,500,000
TOTAL LIABILITIES	386,100,000	'	386,100,000	'	401,600,000
TOTAL STOCKHOLDERS' EQUITY	294,500,000	'	294,500,000	'	222,600,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	680,600,000	'	680,600,000	'	624,200,000
AECOM's investment in joint ventures	133,800,000	'	133,800,000	'	106,400,000
Joint ventures summarized financial information	'	'	'	'	'
Total revenue	'	'	1,455,300,000	1,504,600,000	'
Gross profit	'	'	39,100,000	49,500,000	'
Summary of AECOM's equity in earnings of unconsolidated joint ventures:	'	'	'	'	'
Pass through joint ventures	'	'	5,500,000	4,800,000	'
Other joint ventures	'	'	44,000,000	13,100,000	'
Total	'	'	$49,500,000	$17,900,000	'

Pension_Benefit_Obligations_De

Pension Benefit Obligations (Details) (USD $)

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Sep. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Sep. 30, 2014

In Millions, unless otherwise specified

U.S.

U.S.

U.S.

U.S.

U.S.

Int'l

Int'l

Int'l

Int'l

Int'l

Pension plans.

'

'

'

'

'

'

'

'

'

'

'

'

Service costs

'

'

'

'

'

'

'

$0.20

$0.20

$0.50

$0.70

'

Interest cost on projected benefit obligation

'

'

1.9

1.7

5.7

5

'

7.1

5.9

20.8

18

'

Expected return on plan assets

'

'

-2.1

-2.1

-6.3

-6.4

'

-6.6

-5.6

-19.5

-17.1

'

Amortization of prior service costs

'

'

'

'

'

'

'

-0.1

'

-0.2

-0.1

'

Amortization of net loss

'

'

1

1

3

3.2

'

1.2

0.9

3.7

2.9

'

Settlement loss recognized

'

'

'

'

'

'

'

'

'

'

2.6

'

Net periodic (benefit) cost

'

'

0.8

0.6

2.4

1.8

'

1.8

1.4

5.3

7

'

Employer contributions

'

'

'

'

3.6

'

'

'

'

12.3

'

'

Expected remaining scheduled annual employer contributions for the current fiscal year

'

'

'

'

'

'

1.3

'

'

'

'

4.1

Net pension liabilities included in other long-term liabilities

$184.80

$192.70

'

'

'

'

'

'

'

'

'

'

Debt_Details

Debt (Details) (USD $)

9 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

9 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 31, 2010

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jul. 31, 2010

Jun. 30, 2014

Sep. 30, 2013

Jul. 31, 2010

Jun. 30, 2014

Jan. 31, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Unsecured term credit agreement

Unsecured term credit agreement

Unsecured term credit agreement

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Unsecured term credit agreement in June 2013

Prior term loan facility

Unsecured senior notes

Unsecured senior notes

Unsecured senior notes

Unsecured senior notes

5.43% Senior Notes, Series A, due July 2020

1.00% Senior Discount Notes, Series B, due July 2022

1.00% Senior Discount Notes, Series B, due July 2022

1.00% Senior Discount Notes, Series B, due July 2022

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Unsecured revolving credit facility

Other debt

Other debt

Unsecured credit facilities

Minimum

Base rate

Base rate

Base rate

Eurocurrency rate

Eurocurrency rate

Eurocurrency rate

Minimum

Minimum

Maximum

Base rate

Base rate

Base rate

Eurocurrency rate

Eurocurrency rate

Eurocurrency rate

item

Minimum

Maximum

Minimum

Maximum

item

Minimum

Maximum

Minimum

Maximum

Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total debt

$1,043,400,000

'

$1,173,300,000

$750,000,000

$750,000,000

'

'

'

'

'

'

'

'

'

'

'

$262,900,000

$260,200,000

'

'

'

'

'

'

'

$114,700,000

'

'

'

'

'

'

'

'

$30,500,000

$48,400,000

'

Less: Current portion of debt and short-term borrowings

-66,500,000

'

-84,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term debt, less current portion

976,963,000

'

1,089,060,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Scheduled maturities of debt:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2014 (three months remaining)

66,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

38,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

38,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

37,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2018

600,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Thereafter

262,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total debt

1,043,400,000

'

1,173,300,000

750,000,000

750,000,000

'

'

'

'

'

'

'

'

'

'

'

262,900,000

260,200,000

'

'

'

'

'

'

'

114,700,000

'

'

'

'

'

'

'

'

30,500,000

48,400,000

'

Debt agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Face amount of debt instrument

'

'

'

'

'

'

'

750,000,000

'

'

'

'

'

'

'

300,000,000

'

'

'

175,000,000

'

'

125,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional borrowings available

'

'

'

'

'

'

'

100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayment of indebtedness

1,547,557,000

1,748,366,000

'

'

'

'

'

'

'

'

'

'

'

'

675,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate, basis spread (as a percent)

'

'

'

'

'

'

'

'

'

0.13%

1.25%

'

1.13%

2.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

1.25%

'

1.13%

2.25%

'

'

'

Interest rate (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.43%

'

'

1.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Description of interest rate basis

'

'

'

'

'

'

'

'

'Base Rate

'

'

'Eurodollar Rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Base Rate

'

'

'Eurocurrency Rate

'

'

'

'

'

Average interest rate (as a percent)

'

'

'

'

'

'

1.66%

1.98%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Final principal payment

'

'

'

'

'

'

600,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effective interest rate (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.62%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of debt instrument

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

282,100,000

269,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from sale of senior notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

249,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of subsidiary guarantors

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum borrowing capacity under the credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,050,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Contingent increase to maximum borrowing capacity under the credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,250,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of commitment fee

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

0.35%

'

'

'

'

'

'

'

'

'

Outstanding letters of credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,500,000

'

35,500,000

'

'

'

'

'

'

'

'

274,800,000

236,400,000

'

Remaining borrowing capacity under the credit facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,040,500,000

'

'

'

'

'

'

'

'

'

'

'

'

332,900,000

Actual consolidated leverage ratio under debt agreements

2.54

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum consolidated leverage ratio under debt agreements

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net worth threshold, base amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net worth threshold, percentage of the consolidated net income for each fiscal quarter commencing with the specified period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Actual net worth of the entity

2,197,512,000

'

2,021,443,000

'

'

'

'

'

'

'

'

'

'

'

'

'

2,200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net worth threshold

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,700,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Average effective interest rate on total borrowings, including the effects of swaps (as a percent)

2.80%

3.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$87,900,000

$85,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details)

Jun. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

In Millions, unless otherwise specified

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Interest rate swap agreements expiring in June 2018

Interest rate swap agreements expiring in September 2015

Interest rate swap agreements expiring in September 2015

Interest rate swap agreements expiring in December 2014

Interest rate swap agreements expiring in December 2014

Interest rate swap agreements expiring in December 2013

Foreign currency options

Foreign currency options

Foreign currency options

Foreign currency options

USD for foreign currencies

USD for foreign currencies

USD for foreign currencies

USD for foreign currencies

GBP for BRL

GBP for BRL

GBP for BRL

GBP for BRL

GBP for BRL

GBP for BRL

GBP for BRL

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

USD ($)

BRL

USD ($)

BRL

Purchase

Purchase

Sell

Sell

Purchase

Purchase

Purchase

Sell

Sell

Sell

Sell

USD ($)

USD ($)

USD ($)

USD ($)

item

USD ($)

BRL

USD ($)

BRL

USD ($)

BRL

Derivative financial instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional Amount

$300

$250

$250

$200

$200

$150

'

'

'

'

$93.80

$171.80

$59.90

$174.20

'

$1.80

4

$1.90

4.1

$3.60

8.2

Fixed Rate (as a percent)

1.63%

0.95%

0.95%

0.68%

0.68%

0.55%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Notional principal of derivative exchange contracts

'

'

'

'

'

'

$0.50

1.1

$0.90

2.1

'

'

'

'

'

'

'

'

'

'

'

Maximum maturity term

'

'

'

'

'

'

'12 months

'12 months

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of contracts

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

'

'

'

'

'

'

Derivative_Financial_Instrumen3

Derivative Financial Instruments (Details 2) (USD $)

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2014

Sep. 30, 2013

In Millions, unless otherwise specified

Interest rate swap agreements

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Derivatives not designated as hedging instruments

Cash flow hedges

Foreign currency options

Foreign currency options

Foreign currency options

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Interest rate swap agreements

Option contracts

Option contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Foreign currency forward contracts

Cash flow hedges

Prepaid expenses and other current assets

Prepaid expenses and other current assets

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Cash flow hedges

Accrued expenses and other current liabilities

Accrued expenses and other current liabilities

Other long-term liabilities

Other long-term liabilities

Other income (expense)

Other income (expense)

General and administrative expenses

General and administrative expenses

General and administrative expenses

Prepaid expenses and other current assets

Prepaid expenses and other current assets

Accrued expenses and other current liabilities

Accrued expenses and other current liabilities

Cost of revenue

Other income (expense)

Other income (expense)

Other income (expense)

Other income (expense)

Fair values of outstanding derivative instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative assets

$1.60

$1.70

'

'

$0.10

$0.10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.50

$1.60

'

'

Derivative liabilities

5.5

5.2

'

'

'

'

'

'

'

'

'

'

'

'

4.3

2.6

0.4

1.1

'

'

'

'

'

'

'

'

'

'

'

0.8

1.5

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

'

'

4.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Effect of derivative instruments on income and other comprehensive income

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Decrease/(Increase) in Losses Recognized in Accumulated Other Comprehensive Loss on Derivatives Before Tax Effect (Effective Portion)

'

'

4.6

'

'

'

-2.9

0.4

-3.2

0.4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Losses Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)

'

'

'

'

'

'

'

'

'

'

-0.7

-0.8

-2.3

-2.3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gains / (Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)

'

'

'

0.1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Non designated derivatives, Gains/(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.60

($3.90)

$0

($4.20)

$0.10

($0.30)

$0.60

($4)

($3.90)

'

'

'

'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (Recurring basis, USD $)	Mar. 31, 2014	Sep. 30, 2013
In Millions, unless otherwise specified
Fair value	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	$1.60	$1.70
Total liabilities	5.5	5.2
Fair value | Foreign currency options	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	0.1	0.1
Fair value | Foreign currency forward contracts	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	1.5	1.6
Total liabilities	0.8	1.5
Fair value | Interest rate swap agreements	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total liabilities	4.7	3.7
Quoted Prices in Active Markets for Similar Assets (Level 2)	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	1.6	1.7
Total liabilities	5.5	5.2
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency options	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	0.1	0.1
Quoted Prices in Active Markets for Similar Assets (Level 2) | Foreign currency forward contracts	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total assets	1.5	1.6
Total liabilities	0.8	1.5
Quoted Prices in Active Markets for Similar Assets (Level 2) | Interest rate swap agreements	'	'
Non-pension financial assets and liabilities measured at fair value	'	'
Total liabilities	$4.70	$3.70

Sharebased_Payments_Details

Share-based Payments (Details) (USD $)	9 Months Ended		12 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Compensation expense	'	'	'
Recognized compensation expense	$26,000,000	$27,400,000	'
Unrecognized compensation expense	68,900,000	'	52,600,000
Period of recognition of unrecognized compensation expense	'3 years	'	'3 years
Stock options, Weighted Average Exercise Price	'	'	'
Excess tax benefit from share-based payment	$626,000	$1,754,000	'
Stock options	'	'	'
Stock options, Shares of stock under options	'	'	'
Balance at the beginning of the period (in shares)	1.6	2.5	2.5
Granted (in shares)	0.6	'	'
Exercised (in shares)	-0.4	-0.6	'
Options forfeited or expired (in shares)	-0.1	-0.2	'
Balance at the end of the period (in shares)	1.7	1.7	'
Vested and expected to vest in the future at the end of the period (in shares)	1.7	1.7	'
Stock options, Weighted Average Exercise Price	'	'	'
Balance at the beginning of the period (in dollars per share)	$24.73	$22.81	$22.81
Granted (in dollars per share)	$31.62	'	'
Exercised (in dollars per share)	$22.99	$17.55	'
Options forfeited or expired (in dollars per share)	$26.86	$26.95	'
Balance at the end of the period (in dollars per share)	$27.57	$24.32	'
Vested and expected to vest in the future at the end of the period (in dollars per share)	$27.57	$24.32	'
Performance Earnings Program	'	'	'
Compensation expense	'	'	'
Performance period over which objectives must be met to qualify for an award grant, one	'2 years	'	'
Performance period over which objectives must be met to qualify for an award grant, two	'3 years	'	'

Income_Taxes_Details

Income Taxes (Details)	9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Income Taxes	'	'
Effective tax rate (as a percent)	23.70%	25.60%
Tax at federal statutory rate (as a percent)	35.00%	'

Earnings_Per_Share_Details

Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share	'	'	'	'
Denominator for basic earnings per share (in shares)	97,483,000	99,257,000	96,933,000	101,482,000
Potential common shares (in shares)	1,500,000	1,500,000	1,400,000	1,200,000
Denominator for diluted earnings per share (in shares)	98,956,000	100,761,000	98,295,000	102,706,000

Other_Financial_Information_De

Other Financial Information (Details) (USD $)	Jun. 30, 2014	Sep. 30, 2013
Accrued expenses	'	'
Accrued salaries and benefits	$419,400,000	$410,600,000
Accrued contract costs	396,400,000	404,200,000
Other accrued expenses	114,900,000	100,500,000
Total accrued expenses	930,693,000	915,282,000
Accrued contract costs related to professional liability accruals	117,700,000	121,300,000
Other long-term liabilities	'	'
Pension liabilities (Note 7)	184,800,000	192,700,000
Reserve for uncertain tax positions	58,200,000	60,200,000
Other	196,400,000	196,000,000
Total other long-term liabilities	$439,446,000	$448,920,000

Reclassifications_out_of_Accum2

Reclassifications out of Accumulated Other Comprehensive Loss (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated balances	'	'	'	'
Balance at the beginning of the period	($284,300,000)	'	($261,299,000)	'
Other comprehensive income before reclassification	17,400,000	'	-9,500,000	'
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax	1,500,000	'	4,500,000	'
Amounts reclassified from accumulated other comprehensive loss, cash flow hedge losses, net of tax	411,000	478,000	1,300,000	1,372,000
Balance at the end of the period	-264,951,000	'	-264,951,000	'
Pension Related Adjustments	'	'	'	'
Accumulated balances	'	'	'	'
Balance at the beginning of the period	-193,400,000	'	-192,800,000	'
Other comprehensive income before reclassification	-3,300,000	'	-6,900,000	'
Amounts reclassified from accumulated other comprehensive loss, actuarial losses, net of tax	1,500,000	'	4,500,000	'
Balance at the end of the period	-195,200,000	'	-195,200,000	'
Foreign Currency Translation Adjustments	'	'	'	'
Accumulated balances	'	'	'	'
Balance at the beginning of the period	-89,400,000	'	-66,400,000	'
Other comprehensive income before reclassification	22,300,000	'	-700,000	'
Balance at the end of the period	-67,100,000	'	-67,100,000	'
Loss on Derivative Instruments	'	'	'	'
Accumulated balances	'	'	'	'
Balance at the beginning of the period	-1,500,000	'	-2,100,000	'
Other comprehensive income before reclassification	-1,600,000	'	-1,900,000	'
Amounts reclassified from accumulated other comprehensive loss, cash flow hedge losses, net of tax	400,000	'	1,300,000	'
Balance at the end of the period	($2,700,000)	'	($2,700,000)	'

Reclassifications_out_of_Accum3

Reclassifications out of Accumulated Other Comprehensive Loss (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amounts Reclassified from Accumulated Other Comprehensive Loss	'	'	'	'
Income before income tax expense	$82,769	$101,394	$220,496	$221,812
Income tax expense	-13,677	-30,179	-52,367	-56,843
Net income	69,092	71,215	168,129	164,969
Cash flow hedges | Reclassification out of accumulated other comprehensive loss	'	'	'	'
Amounts Reclassified from Accumulated Other Comprehensive Loss	'	'	'	'
Income tax expense	-300	'	-1,000	'
Net income	400	'	1,300	'
Cash flow hedges | Reclassification out of accumulated other comprehensive loss | Interest expense	'	'	'	'
Amounts Reclassified from Accumulated Other Comprehensive Loss	'	'	'	'
Income before income tax expense	700	'	2,300	'
Actuarial losses | Reclassification out of accumulated other comprehensive loss	'	'	'	'
Amounts Reclassified from Accumulated Other Comprehensive Loss	'	'	'	'
Income tax expense	-700	'	-2,000	'
Net income	1,500	'	4,500	'
Actuarial losses | Reclassification out of accumulated other comprehensive loss | Cost of revenue and General and administrative expenses	'	'	'	'
Amounts Reclassified from Accumulated Other Comprehensive Loss	'	'	'	'
Income before income tax expense	$2,200	'	$6,500	'

Commitments_and_Contingencies_

Commitments and Contingencies (Details)	9 Months Ended			9 Months Ended	12 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jul. 27, 2014	Jun. 30, 2014	Jun. 30, 2014	Sep. 30, 2006	Mar. 31, 2014	Jun. 17, 2014
	USD ($)	Subsequent event	Standby letters of credit	AECOM Australia	AECOM Australia	AECOM Australia	AECOM Australia
	item	item	USD ($)	item	AUD	RCM applicants	Portigon
						USD ($)	USD ($)
Commitments and Contingencies	'	'	'	'	'	'	'
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees	'	'	$284.30	'	'	'	'
Proceeds from initial public offering (IPO)	'	'	'	'	700	'	'
Bank loan	'	'	'	'	1,400	'	'
Number of initial public offering investors	'	'	'	770	'	'	'
Damages claimed by applicants	'	'	'	'	'	1,680	76
Securities acquired by investors	$155	'	'	'	'	'	'
Number of actions filed till date	'	5	'	'	'	'	'
Number of merger subsidiaries formed for purposes of effecting the merger	2	'	'	'	'	'	'

Reportable_Segments_Details

Reportable Segments (Details) (USD $)	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
			item
Reportable Segments	'	'	'	'
Number of reportable segments	'	'	2	'
Summarized financial information concerning the Company's reportable segments	'	'	'	'
Revenue	$1,968,155,000	$2,067,490,000	$5,794,254,000	$6,074,408,000
Revenue, net of other direct costs	1,204,700,000	1,236,000,000	3,536,400,000	3,732,900,000
Gross profit	108,540,000	131,814,000	274,145,000	309,775,000
Equity in earnings of joint ventures	5,896,000	4,094,000	49,415,000	17,855,000
General and administrative expenses	-22,904,000	-24,010,000	-73,198,000	-73,365,000
Operating income (loss)	91,532,000	111,898,000	250,362,000	254,265,000
Gross profit as a % of revenue	5.50%	6.40%	4.70%	5.10%
Gross profit as a % of revenue, net of other direct costs	9.00%	10.70%	7.80%	8.30%
Corporate	'	'	'	'
Summarized financial information concerning the Company's reportable segments	'	'	'	'
General and administrative expenses	-22,900,000	-24,000,000	-73,200,000	-73,400,000
Operating income (loss)	-22,900,000	-24,000,000	-73,200,000	-73,400,000
Professional Technical Services	'	'	'	'
Summarized financial information concerning the Company's reportable segments	'	'	'	'
Revenue	1,794,600,000	1,847,100,000	5,248,400,000	5,384,200,000
Revenue, net of other direct costs	1,112,000,000	1,102,000,000	3,214,700,000	3,306,100,000
Gross profit	99,500,000	119,800,000	244,700,000	281,300,000
Equity in earnings of joint ventures	2,100,000	1,000,000	36,500,000	10,300,000
Operating income (loss)	101,600,000	120,800,000	281,200,000	291,600,000
Gross profit as a % of revenue	5.50%	6.50%	4.70%	5.20%
Gross profit as a % of revenue, net of other direct costs	8.90%	10.90%	7.50%	8.50%
Management Support Services	'	'	'	'
Summarized financial information concerning the Company's reportable segments	'	'	'	'
Revenue	173,600,000	220,400,000	545,900,000	690,200,000
Revenue, net of other direct costs	92,700,000	134,000,000	294,700,000	426,800,000
Gross profit	9,000,000	12,000,000	29,400,000	28,500,000
Equity in earnings of joint ventures	3,900,000	3,100,000	13,000,000	7,600,000
Operating income (loss)	$12,900,000	$15,100,000	$42,400,000	$36,100,000
Gross profit as a % of revenue	5.20%	5.40%	5.40%	4.10%
Gross profit as a % of revenue, net of other direct costs	9.70%	9.00%	10.00%	6.70%

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent event, USD $)	0 Months Ended
	Jul. 11, 2014	Jul. 11, 2015	Apr. 11, 2015
Maximum	'	'	'
Subsequent event	'	'	'
Out-of-pocket fees and expense to be reimburse by non-terminating party	'	'	$40,000,000
URS Corporation	'	'	'
Subsequent event	'	'	'
Proposed stock issuance for acquisition	4,000,000,000	'	'
Agreement termination fee	'	$240,000,000	$140,000,000