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Derivative Financial Instruments (Details) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014 Cash Flow Hedging [Member] Interest Rate Swap [Member] USD ($)	Dec. 31, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] USD ($)	Dec. 31, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] USD ($)	Dec. 31, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap June 2018 [Member] USD ($)	Sep. 30, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap June 2018 [Member] USD ($)	Dec. 31, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap September 2015 [Member] USD ($)	Sep. 30, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap September 2015 [Member] USD ($)	Sep. 30, 2014 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Interest Rate Swap December 2014 [Member] USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] United States of America, Dollars Purchase USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] United States of America, Dollars Purchase USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] United States of America, Dollars Sell USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] United States of America, Dollars Sell USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Brazil, Brazil Real Purchase USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Brazil, Brazil Real Purchase BRL	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Brazil, Brazil Real Purchase USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign Exchange Forward [Member] Brazil, Brazil Real Purchase BRL	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] Options Held [Member] USD ($)	Sep. 30, 2014 Not Designated as Hedging Instrument [Member] Options Held [Member] USD ($)
Derivative financial instruments
Effective portion of derivatives before tax effect	$ 4.8us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	$ (2.5)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
Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to interest expense, net	4.9us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Notional Amount				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	96.1invest_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	98.3invest_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	1.4invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember	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
Fixed Rate (as a percent)				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																	$ 0acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember	$ 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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Namespace Prefix:	acm_
Data Type:	xbrli:monetaryItemType
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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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

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

Name:	us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
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

+ Details

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

X

- Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration