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Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended
	Dec. 31, 2014	Oct. 17, 2014	Dec. 31, 2013	Oct. 24, 2014
Pro Forma Operating Results
Total	$ 138,463,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
Write-off of debt issuance costs	8,997,000us-gaap_WriteOffOfDeferredDebtIssuanceCost
URS Corporation
Business Acquisition [Line Items]
Percentage of ownership acquired		100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Consideration paid in cash		2,300,000,000us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Consideration paid by issuing stock		1,600,000,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Senior notes assumed in acquisition as part of consideration		1,000,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Repayment of acquiree term loan as part of consideration		600,000,000acm_BusinessCombinationConsiderationTransferredRepaymentOfAcquireeTermLoan / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Repayment of acquiree line of credit as part of consideration		100,000,000acm_BusinessCombinationConsiderationTransferredRepaymentOfAcquireeLineOfCredit / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Cash and cash equivalents		285,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accounts receivable		2,572,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Prepaid expenses and other current assets		373,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Property and equipment		609,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Total identifiable intangible assets		830,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Goodwill		3,801,000,000acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Other non-current assets		347,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accounts payable		(750,200,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accrued expenses and other current liabilities		(1,091,400,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Billings in excess of cost on uncompleted contracts		(196,100,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Current portion of long-term debt		(47,400,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Other long-term liabilities		(473,700,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Pension and post-retirement benefit obligations		(402,100,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPensionAndPostRetirementBenefitObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Long-term debt		(520,200,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Noncontrolling interests		(216,600,000)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net assets acquired		5,120,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accrued Liabilities and Other Liabilities		100,000,000us-gaap_AccruedLiabilitiesAndOtherLiabilities / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Pro Forma Operating Results
Revenue	4,546,000,000us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		4,615,000,000us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Income from continuing operations	163,000,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		40,000,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss)	44,000,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		(57,000,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss) attributable to AECOM	21,000,000acm_BusinessAcquisitionProFormaNetIncomeLossPortionAttributableToParent / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		(83,000,000)acm_BusinessAcquisitionProFormaNetIncomeLossPortionAttributableToParent / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Revenue of acquiree since acquisition date	2,000,000,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Income from continuing operations of acquiree since acquisition date	83,000,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Amortization of intangible assets of acquiree since acquisition date	45,200,000acm_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Fair value adjustment of joint ventures	8,400,000acm_BusinessCombinationFairValueAdjustmentOfJointVentures / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Fair value adjustment of noncontrolling interests	(4,700,000)acm_BusinessCombinationFairValueAdjustmentOfNoncontrollingInterests / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance and personnel costs	109,300,000acm_BusinessCombinationAcquisitionRelatedCostsSeveranceAndPersonnelCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Professional service, real estate-related, and other expenses	29,200,000acm_BusinessCombinationAcquisitionRelatedCostsProfessionalServiceRealEstateRelatedAndOtherExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Total	138,500,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance expense	36,600,000acm_SeveranceExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance expense paid	4,600,000acm_SeveranceExpensesPaid / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Financing-related expenses	68,000,000us-gaap_InterestAndDebtExpense / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Penalty from prepayment of unsecured senior notes	55,600,000us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss) attributable to AECOM per share:
Basic	$ 0.14us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		$ (0.55)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Diluted	$ 0.14us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember		$ (0.55)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
URS Corporation | Customer relationships, contracts and backlog
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Total identifiable intangible assets		822,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = acm_CustomerRelationshipsContractsAndBacklogMember
URS Corporation | Customer relationships, contracts and backlog | Minimum
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Useful life		1 year
URS Corporation | Customer relationships, contracts and backlog | Maximum
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Useful life		11 years
URS Corporation | Customer relationships, contracts and backlog | Weighted Average
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Useful life		7 years
URS Corporation | Trade Name
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Total identifiable intangible assets		7,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
URS Corporation | Senior Notes
Business Acquisition [Line Items]
Percentage price of original principal amount of note at which note can be redeemed		101.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember		101.00%us-gaap_DebtInstrumentRedemptionPricePercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Amount of notes purchased		$ 600,000,000us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember		$ 572,300,000us-gaap_DebtInstrumentRepurchaseAmount / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember

X

- Definition

The pro forma net Income or Loss portion attributable to parent.

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This element represents acquisition-related costs for professional service, real estate-related, and other expenses incurred in connection with a business combination.

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This element represents acquisition-related costs for severance and personnel costs incurred in connection with a business combination.

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Amount of repayment of acquiree line of credit as part of consideration for the business combination.

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Amount of repayment of acquiree term loan as part of consideration for the business combination.

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Fair value adjustment recognized during the period for joint ventures in connection with business combination.

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Fair value adjustment recognized during the period for noncontrolling interests in connection with business combination.

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This element represents the amount of amortization of intangible assets of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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- Definition

Amount of billings in excess of costs on uncompleted contracts assumed at the acquisition date.

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Amount of accrued expenses and other current liabilities assumed at the acquisition date.

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The amount of goodwill recognized as of the acquisition date.

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Amount of pension and post-retirement benefit obligations due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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- Definition

Element represents the severance expense included in severance and personal costs.

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The paid portion of the severance expenses.

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Amount of obligations incurred and payable, pertaining to costs that are statutory in nature, incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include, but not limited to, taxes, interest, rent and utilities. Also includes the aggregate carrying amount of liabilities not separately disclosed.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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This element represents the fair value of the noncontrolling interest in the acquiree at the acquisition date.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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