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Debt (Details) (USD $)	3 Months Ended		0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Oct. 17, 2014	Oct. 24, 2014	Sep. 30, 2014	Oct. 06, 2014
Debt
Total debt	$ 4,977,800,000us-gaap_DebtAndCapitalLeaseObligations				$ 1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Less: Current portion of debt and short-term borrowings	(202,400,000)us-gaap_DebtCurrent				(64,400,000)us-gaap_DebtCurrent
Long-term debt, less current portion	4,775,396,000us-gaap_LongTermDebtAndCapitalLeaseObligations				939,565,000us-gaap_LongTermDebtAndCapitalLeaseObligations
Scheduled maturities of debt:
2015 (nine months remaining)	166,600,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
2016	140,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017	315,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018	119,300,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019	87,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter	4,149,900,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total debt	4,977,800,000us-gaap_DebtAndCapitalLeaseObligations				1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Debt agreements
Repayment of indebtedness	2,053,648,000us-gaap_RepaymentsOfDebt	476,013,000us-gaap_RepaymentsOfDebt
Prepayment Penalty On Unsecured Senior Notes	55,639,000acm_PrepaymentPenaltyOnUnsecuredSeniorNotes
Debt	4,977,800,000us-gaap_DebtAndCapitalLeaseObligations				1,004,000,000us-gaap_DebtAndCapitalLeaseObligations
Actual net worth of the entity	3,550,220,000us-gaap_StockholdersEquity				2,186,517,000us-gaap_StockholdersEquity
Average effective interest rate on total borrowings, including the effects of swaps (as a percent)	4.00%acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap	2.80%acm_LineOfCreditFacilityInterestRateDuringPeriodNetOfInterestRateSwap
Line of Credit [Member]
Debt agreements
Consolidated leverage ratio	4.4acm_ConsolidatedLeverageRatio / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Outstanding letters of credit	111,800,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember				12,100,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Remaining borrowing capacity under the credit facility	859,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember				1,037,900,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Maximum increase in borrowing capacity			500,000,000acm_LineOfCreditFacilityMaximumIncreaseInBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember
Secured Debt [Member]
Debt
Total debt	2,681,100,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember
Scheduled maturities of debt:
Total debt	2,681,100,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember
Debt agreements
Debt	2,681,100,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_CreditFacilityAxis = us-gaap_SecuredDebtMember
Revolving Credit Facility [Member]
Debt agreements
Borrowing capacity			1,050,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Letter of Credit [Member]
Debt agreements
Borrowing capacity			500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember
URS Corporation
Debt agreements
Senior notes assumed in acquisition as part of consideration			1,000,000,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Notes Payable to Banks
Debt
Total debt					712,500,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember
Scheduled maturities of debt:
Total debt					712,500,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember
Debt agreements
Debt					712,500,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_NotesPayableToBanksMember
Senior Notes
Debt
Total debt					263,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Scheduled maturities of debt:
Total debt					263,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Debt agreements
Debt					263,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Fair value of debt instrument	1,652,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Senior Notes | URS Corporation
Debt
Total debt	430,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember			1,000,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Scheduled maturities of debt:
Total debt	430,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember			1,000,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Debt agreements
Debt	430,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember			1,000,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Redemption price percentage			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
Fair value of long term debt	419,800,000us-gaap_LongTermDebtFairValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Senior Notes 5.00 Percent Due 2022 | URS Corporation
Debt agreements
Interest rate (as a percent)				5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.00PercentDue2022Member
Senior Notes 3.85 Percent Due 2017 | URS Corporation
Debt agreements
Interest rate (as a percent)				3.85%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_DebtInstrumentAxis = acm_SeniorNotes3.85PercentDue2017Member
Senior Notes 5.43 Percent Series A Due July 2020 [Member]
Debt agreements
Interest rate (as a percent)			5.43%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.43PercentSeriesADueJuly2020Member
Senior Discount Notes 1.00 Percent Series B Due July 2022 [Member]
Debt agreements
Interest rate (as a percent)			1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorDiscountNotes1.00PercentSeriesBDueJuly2022Member
Other Debt
Debt
Total debt	186,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember				27,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember
Scheduled maturities of debt:
Total debt	186,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember				27,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember
Debt agreements
Debt	186,900,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember				27,600,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember
Outstanding letters of credit	332,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember				301,000,000us-gaap_LettersOfCreditOutstandingAmount / us-gaap_DebtInstrumentAxis = acm_OtherDebtMember
Unsecured Credit Facilities
Debt agreements
Remaining borrowing capacity under the credit facility	483,500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_UnsecuredCreditFacilitiesMember
Revolving Credit Facility [Member]
Debt
Total debt	79,200,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Scheduled maturities of debt:
Total debt	79,200,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Debt agreements
Debt	79,200,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = us-gaap_RevolvingCreditFacilityMember
Term Loan A
Debt agreements
Borrowing capacity			1,925,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_TermLoanMember
Term Loan B
Debt agreements
Borrowing capacity			760,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = acm_TermLoanBMember
Notes
Debt
Total debt	1,600,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member
Scheduled maturities of debt:
Total debt	1,600,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member
Debt agreements
Debt	1,600,000,000us-gaap_DebtAndCapitalLeaseObligations / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022AndSeniorNotes5.875Due2024Member
The 2022 Notes
Debt agreements
Principal amount						800,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022Member
Interest rate (as a percent)						5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.75Due2022Member
The 2024 Notes
Debt agreements
Principal amount						$ 800,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.875Due2024Member
Interest rate (as a percent)						5.875%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = acm_SeniorNotes5.875Due2024Member

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Represents the average effective interest rate during the period, net of the impact of the interest rate swaps.

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Represents the maximum amount of increase in borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Represents the prepayment penalty on unsecured senior notes.

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

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Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Fair value amount of debt instrument that was repurchased.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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