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Derivative Financial Instruments (Details) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended								6 Months Ended	3 Months Ended	6 Months Ended
	Mar. 31, 2015 Cash Flow Hedging Interest rate swap agreements USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Interest rate swap agreements USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Interest rate swap agreements USD ($)	Mar. 31, 2014 Designated as Hedging Instrument Cash Flow Hedging Interest rate swap agreements USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap September 2018 USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap June 2018 USD ($)	Sep. 30, 2014 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap June 2018 USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap September 2015 USD ($)	Sep. 30, 2014 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap September 2015 USD ($)	Sep. 30, 2014 Designated as Hedging Instrument Cash Flow Hedging Interest Rate Swap December 2014 USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Foreign Exchange Option USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Foreign currency forward contracts USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Foreign currency forward contracts USD ($)	Mar. 31, 2015 Designated as Hedging Instrument Cash Flow Hedging Foreign currency forward contracts AUD	Mar. 31, 2015 Not Designated as Hedging Instrument Foreign currency forward contracts United States of America, Dollars Purchase USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument Foreign currency forward contracts United States of America, Dollars Purchase USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument Foreign currency forward contracts United States of America, Dollars Sell USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument Foreign currency forward contracts United States of America, Dollars Sell USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Purchase USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Purchase BRL	Sep. 30, 2014 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Purchase USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Purchase BRL	Mar. 31, 2015 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Sell BRL	Sep. 30, 2014 Not Designated as Hedging Instrument Foreign currency forward contracts Brazil, Brazil Real Sell USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument Options Held USD ($)
Derivative financial instruments
Effective portion of derivatives before tax effect	$ 10.7us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	$ (7.5)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ (10.0)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ (0.3)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember							$ 1.2us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeOptionMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ (1.4)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ (1.4)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to interest expense, net	6.3us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Notional Amount					300.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	300.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	300.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	250.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	250.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	200.0invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapDecember2014Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember					90.3invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	69.5invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	70.4invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember	71.5invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember	1.2invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	3.9invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	0.4invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	1.1invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	3.9invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember	1.2invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember
Fixed Rate (as a percent)					1.54%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	1.63%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	1.63%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	0.95%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	0.95%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	0.68%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapDecember2014Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Notional principal of derivative exchange contracts												$ 17.8acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	$ 17.8acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember	21.9acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember											$ 0acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

X

- Definition

Aggregate notional amount of foreign currency derivatives to exchange foreign currencies. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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