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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 |  |  |  |  |  |  |  |  |
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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 | $ 10.7 us-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 |  |  |  |  |  |  | $ 1.2 us-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 | 6.3 us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  | 300.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 300.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 300.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapJune2018Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 250.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 250.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapSeptember2015Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 200.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = acm_InterestRateSwapDecember2014Member / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  | 90.3 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 69.5 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 70.4 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember | 71.5 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_USD / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember | 1.2 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 3.9 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 0.4 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 1.1 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 3.9 invest_DerivativeNotionalAmount / us-gaap_CurrencyAxis = currency_BRL / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember | 1.2 invest_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 |  |  |  |  |  |  |  |  |  |  |  | $ 17.8 acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | $ 17.8 acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 21.9 acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |  |  |  |  |  |  | $ 0 acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_OptionMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- 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
Name: | acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts
Namespace Prefix: | acm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- 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

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- 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

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

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