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Other Financial Information (Details) (USD $)
Dec. 31, 2014
Sep. 30, 2014
Accrued expenses    
Accrued salaries and benefits $ 866,000,000us-gaap_EmployeeRelatedLiabilitiesCurrent $ 400,600,000us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued contract costs 773,700,000acm_AccruedContractCostsCurrent 446,400,000acm_AccruedContractCostsCurrent
Other accrued expenses 214,600,000us-gaap_OtherAccruedLiabilitiesCurrent 117,600,000us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses 1,854,293,000us-gaap_AccruedLiabilitiesCurrent 964,627,000us-gaap_AccruedLiabilitiesCurrent
Accrued contract costs related to professional liability accruals $ 244,800,000acm_AccruedContractCostsRelatedToProfessionalLiabilityCurrent $ 120,200,000acm_AccruedContractCostsRelatedToProfessionalLiabilityCurrent