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Business Acquisitions, Goodwill and Intangible Assets (Details) (USD $)	3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2015	Oct. 17, 2014	Dec. 31, 2014	Dec. 31, 2013	Oct. 24, 2014
Pro Forma Operating Results
Total	$ 91,599,000us-gaap_BusinessCombinationAcquisitionRelatedCosts	$ 230,062,000us-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			284,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accounts receivable			2,579,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Prepaid expenses and other current assets			356,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Property and equipment			579,900,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Total identifiable intangible assets			991,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Goodwill			3,846,900,000acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwill / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Other non-current assets			335,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accounts payable			(720,000,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Accrued expenses and other current liabilities			(1,136,000,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccruedExpensesAndOtherCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Billings in excess of cost on uncompleted contracts	(118,700,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	(118,700,000)acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	(369,000,000)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			(433,000,000)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			(225,600,000)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			125,000,000us-gaap_AccruedLiabilitiesAndOtherLiabilities / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Fair value of margin liability			172,900,000acm_BusinessCombinationRecognizedMarginFairValueLiability / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Pro Forma Operating Results
Revenue				9,044,000,000us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	9,082,000,000us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Income from continuing operations				207,000,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	10,000,000us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss)				137,000,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	(105,000,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss) attributable to AECOM				85,000,000acm_BusinessAcquisitionProFormaNetIncomeLossPortionAttributableToParent / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	(130,000,000)acm_BusinessAcquisitionProFormaNetIncomeLossPortionAttributableToParent / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Revenue of acquiree since acquisition date		4,200,000,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Income from continuing operations of acquiree since acquisition date		46,800,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Amortization of intangible assets of acquiree since acquisition date	93,400,000acm_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	192,400,000acm_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Fair value adjustment of joint ventures	9,700,000acm_BusinessCombinationFairValueAdjustmentOfJointVentures / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	17,800,000acm_BusinessCombinationFairValueAdjustmentOfJointVentures / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Fair value adjustment of noncontrolling interests	(5,700,000)acm_BusinessCombinationFairValueAdjustmentOfNoncontrollingInterests / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	(15,200,000)acm_BusinessCombinationFairValueAdjustmentOfNoncontrollingInterests / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance and personnel costs	42,200,000acm_BusinessCombinationAcquisitionRelatedCostsSeveranceAndPersonnelCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	151,500,000acm_BusinessCombinationAcquisitionRelatedCostsSeveranceAndPersonnelCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Professional service, real estate-related, and other expenses	49,400,000acm_BusinessCombinationAcquisitionRelatedCostsProfessionalServiceRealEstateRelatedAndOtherExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	78,600,000acm_BusinessCombinationAcquisitionRelatedCostsProfessionalServiceRealEstateRelatedAndOtherExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Total	91,600,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	230,100,000us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance expense		63,400,000acm_SeveranceExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Severance expense paid		21,200,000acm_SeveranceExpensesPaid / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Financing-related expenses	4,000,000us-gaap_InterestAndDebtExpense / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	72,000,000us-gaap_InterestAndDebtExpense / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Penalty from prepayment of unsecured senior notes		55,600,000us-gaap_PaymentsOfDebtExtinguishmentCosts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Write-off of debt issuance costs		9,000,000us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Net income (loss) attributable to AECOM per share:
Basic				$ 0.56us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	$ (0.86)us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Diluted				$ 0.56us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember	$ (0.86)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			983,800,000us-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			3 years
URS Corporation | Trade Name
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Total identifiable intangible assets			7,800,000us-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
URS Corporation | Adjustment
Estimated fair values of the assets acquired and liabilities assumed, as of the acquisition dates, from acquisitions
Total identifiable intangible assets	161,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	161,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Noncontrolling interests	2,300,000us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	2,300,000us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Net income (loss) attributable to AECOM per share:
Increase in fair value margin liability	172,900,000acm_BusinessCombinationRecognizedMarginFairValueLiabilityAdjustment / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	172,900,000acm_BusinessCombinationRecognizedMarginFairValueLiabilityAdjustment / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Increase (decrease) in amortization expense	53,900,000acm_IncreaseDecreaseAmortizationExpenses / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Increase(decrease) in revenue	$ 24,400,000acm_IncreaseDecreaseRevenues / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember

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- 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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- Definition

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

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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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Represents the margin fair value liability of acquisition.

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Amount of adjustment made to carrying amount of fair value margin liability for acquisition.

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Amount of amortization expense increase (decrease) for adjustment of carrying amount of intangible assets acquired.

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Amount of revenue increase (decrease) for adjustment in carrying amount of fair value margin liability resulting through acquisition.

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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 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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