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Derivative Financial Instruments (Details) In Millions, unless otherwise specified |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in June 2018 USD ($) | Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in September 2015 USD ($) | Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in September 2015 USD ($) | Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2014 USD ($) | Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2014 USD ($) | Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2013 USD ($) | Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options USD ($) | Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options BRL | Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options USD ($) | Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options BRL | Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Purchase USD ($) | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Purchase USD ($) | Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Sell USD ($) | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Sell USD ($) | Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase item | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase USD ($) | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase BRL | Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell USD ($) | Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell BRL | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell USD ($) | Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell BRL
Derivative financial instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount | $ 300.0 | $ 250.0 | $ 250.0 | $ 200.0 | $ 200.0 | $ 150.0 |  |  |  |  | $ 93.8 | $ 171.8 | $ 59.9 | $ 174.2 |  | $ 1.8 | 4.0 | $ 1.9 | 4.1 | $ 3.6 | 8.2
Fixed Rate (as a percent) | 1.63% | 0.95% | 0.95% | 0.68% | 0.68% | 0.55% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional principal of derivative exchange contracts |  |  |  |  |  |  | $ 0.5 | 1.1 | $ 0.9 | 2.1 |  |  |  |  |  |  |  |  |  |  |
Maximum maturity term |  |  |  |  |  |  | 12 months | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |

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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 Represents the number of contracts entered into by the entity. + References No definition available. + Details
Name: | acm_NumberOfContracts
Namespace Prefix: | acm_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
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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
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_DerivativeHigherRemainingMaturityRange1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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