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Business Acquisitions, Goodwill and Intangible Assets (Details 3) (USD $) | 6 Months Ended | 3 Months Ended |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Sep. 30, 2014 | Oct. 17, 2014
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
2015 (six months remaining) | $ 196,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  | $ 196,000,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |
2016 | 191,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  | 191,300,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |
2017 | 97,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  | 97,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |
2018 | 79,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  | 79,200,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |
2019 | 73,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  | 73,800,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |
Thereafter | 216,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  | 216,600,000 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive |  |
Intangible Assets, Net | 854,493,000 us-gaap_FiniteLivedIntangibleAssetsNet |  | 854,493,000 us-gaap_FiniteLivedIntangibleAssetsNet | 90,238,000 us-gaap_FiniteLivedIntangibleAssetsNet |
Gross Amount | 1,253,300,000 us-gaap_FiniteLivedIntangibleAssetsGross |  | 1,253,300,000 us-gaap_FiniteLivedIntangibleAssetsGross | 280,900,000 us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization | (398,800,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | (398,800,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | (190,700,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Intangible Assets, Net | 854,493,000 us-gaap_FiniteLivedIntangibleAssetsNet |  | 854,493,000 us-gaap_FiniteLivedIntangibleAssetsNet | 90,238,000 us-gaap_FiniteLivedIntangibleAssetsNet |
Amortization expense | 208,100,000 us-gaap_AmortizationOfIntangibleAssets | 11,400,000 us-gaap_AmortizationOfIntangibleAssets |  |  |
URS Corporation |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Billings in excess of costs on uncompleted contracts | 118,700,000 acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  | 118,700,000 acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  | 369,000,000 acm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBillingsInExcessOfCostsOnUncompletedContracts / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember
Revenue and related income from operations | 54,200,000 acm_PercentageOfCompletionRevenueRecognition / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  | 29,800,000 acm_PercentageOfCompletionRevenueRecognition / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  |
Minimum | URS Corporation |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Years the remaining liability will be recognized | 1 year |  |  |  |
Maximum | URS Corporation |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Years the remaining liability will be recognized | 5 years |  |  |  |
Backlog and customer relationship |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Intangible Assets, Net | 854,200,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 854,200,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 88,800,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Gross Amount | 1,236,900,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 1,236,900,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 271,600,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Accumulated Amortization | (382,700,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | (382,700,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (182,800,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Intangible Assets, Net | 854,200,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 854,200,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 88,800,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Backlog and customer relationship | Minimum |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Amortization Period | 1 year |  |  |  |
Backlog and customer relationship | Maximum |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Amortization Period | 11 years |  |  |  |
Trademark / tradename |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Intangible Assets, Net | 300,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | 300,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 1,400,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Gross Amount | 16,400,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | 16,400,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | 9,300,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Accumulated Amortization | (16,100,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | (16,100,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | (7,900,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Intangible Assets, Net | $ 300,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |  | $ 300,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember | $ 1,400,000 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksAndTradeNamesMember |
Amortization Period | 2 years |  |  |  |
Trademark / tradename | Minimum |  |  |  |  |
Estimated amortization expense of intangible assets for the remainder of fiscal 2013 and for the succeeding years |  |  |  |  |
Amortization Period | 3 months 18 days |  |  |  |

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