XML 70 R59.htm IDEA: XBRL DOCUMENT
v3.19.1

Derivative Financial Instruments and Fair Value Measurements - Cash Flow Hedges (Details) - Designated as Hedging Instrument - Cash Flow Hedging $ in Millions, $ in Millions | Mar. 31, 2019 AUD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 AUD ($) | Sep. 30, 2018 USD ($)
--- | --- | --- | --- | ---
Interest Rate Swap February 2021 | AUD |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  | $ 200.0 |  | $ 200.0
Fixed Rate (as a percent) | 2.19% | 2.19% | 2.19% | 2.19%
Interest Rate Swap September 2022 | CAD |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  | $ 400.0 |  | $ 400.0
Fixed Rate (as a percent) | 2.49% | 2.49% | 2.49% | 2.49%
Interest Rate Swap February 2023 | USD |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount |  | $ 200.0 |  | $ 200.0
Fixed Rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Foreign currency contracts |  |  |  |
Derivative financial instruments |  |  |  |
Notional Amount | $ 41.5 | $ 31.3 | $ 65.2 | $ 49.1

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
Name: | invest_DerivativeNotionalAmount
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=acm_InterestRateSwapFebruary2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=acm_InterestRateSwapSeptember2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CurrencyAxis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=acm_InterestRateSwapFebruary2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |