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Commitments and Contingencies (Details) | 0 Months Ended |  | 0 Months Ended |  | 1 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 6 Months Ended | 0 Months Ended
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Jun. 17, 2014 AUD | Nov. 17, 2014 URS Corporation USD ($) | Dec. 31, 2014 Standby Letters of Credit [Member] USD ($) | Oct. 17, 2014 USAID Egyptian Projects URS Corporation Washington Group International USD ($) item project | Dec. 31, 2014 DOE Deactivation Demolition And Removal Project Member URS Corporation Washington Group International USD ($) | Dec. 31, 2014 DOE Deactivation Demolition And Removal Project Member Department of Energy Member USD ($) | Dec. 31, 2014 DOE Deactivation Demolition And Removal Project Member Department of Energy Member URS Corporation Washington Group International USD ($) | Jan. 31, 2010 Canadian Pipeline Contract Member URS Corporation Flint Energy Services Ltd Member CAD | Dec. 06, 2014 Waste Isolation Pilot Plant Environmental Incidents Member URS Corporation Nuclear Waste Partnership LLC Member USD ($) | Dec. 31, 2014 AECOM Australia [Member] item | Sep. 30, 2006 AECOM Australia [Member] AUD | Mar. 31, 2014 RCM applicants USD ($) | Jun. 17, 2014 Portigon AG AUD
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |
Contingency liability of general and professional liability insurance programs and for payment and performance guarantees |  |  | $ 443,800,000 us-gaap_LossContingencyEstimateOfPossibleLoss / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember |  |  |  |  |  |  |  |  |  |
Number of subcontractors |  |  |  | 2 us-gaap_LossContingencyNumberOfDefendants / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_UsaidEgyptianProjectsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |  |  |  |
Number of projects failed to comply USAID regulations |  |  |  | 5 acm_NumberOfProjectsFailedToComplyRegulations / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_UsaidEgyptianProjectsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |  |  |  |
Amount paid to federal government for the five completed and operational projects ( including damages and civil penalties) |  |  |  | 373,000,000 acm_LossContingencyPaymentsIncludingDamagesAndCivilPenalties / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_UsaidEgyptianProjectsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |  |  |  |
Projects costs, minimum |  |  |  |  | 146,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember | 106,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / dei_LegalEntityAxis = acm_DepartmentOfEnergyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember | 106,000,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / dei_LegalEntityAxis = acm_DepartmentOfEnergyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |
Projects costs, maximum |  |  |  |  |  |  | 146,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / dei_LegalEntityAxis = acm_DepartmentOfEnergyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |
Total project costs |  |  |  |  | 300,000,000 us-gaap_LossContingencyRangeOfPossibleLossPortionNotAccrued / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |  |  |
Amount recovery ( including additional Fees) |  |  |  |  |  |  | 103,000,000 acm_LossContingencyAmountEstimatedRecoveryFromThirdParty / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / dei_LegalEntityAxis = acm_DepartmentOfEnergyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |
Minimum cost to complete the project |  |  |  |  |  |  | 100,000,000 acm_MinimumEstimatedCostToCompleteProjectAndPromisedAmenities / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / dei_LegalEntityAxis = acm_DepartmentOfEnergyMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_DoeDeactivationDemolitionAndRemovalProjectMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_WashingtonGroupInternationalMember |  |  |  |  |  |
Civil penalty Amount |  |  |  |  |  |  |  |  | 17,700,000 us-gaap_LossContingencyDamagesPaidValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_WasteIsolationPilotPlantEnvironmentalIncidentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_NuclearWastePartnershipLlcMember |  |  |  |
Proceeds from initial public offering (IPO) |  |  |  |  |  |  |  |  |  |  | 700,000,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_AECOMAustraliaMember |  |
Bank loan |  |  |  |  |  |  |  |  |  |  | 1,400,000,000 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_AECOMAustraliaMember |  |
Number of initial public offering investors |  |  |  |  |  |  |  |  |  | 770 acm_NumberOfInitialPublicOfferingInvestors / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_AECOMAustraliaMember |  |  |
Damages claimed by applicants |  |  |  |  |  |  |  | 85,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_CanadianPipelineContractMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = acm_FlintEnergyServicesLtdMember |  |  |  | 1,680,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_SpvAndAffiliatedSpvsMember | 76,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = acm_PortigonAgMember
Securities acquired by investors | 155,000,000 acm_SecuritiesAcquiredByInvestors |  |  |  |  |  |  |  |  |  |  |  |
Amount agreed to pay fees and expenses |  | $ 900,000 us-gaap_LitigationSettlementExpense / us-gaap_BusinessAcquisitionAxis = acm_UrsCorporationMember |  |  |  |  |  |  |  |  |  |  |

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