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  <element id="acm_AcceleratedRecoveryOfPensionEntitlementMember" name="AcceleratedRecoveryOfPensionEntitlementMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_DesignBuildContractorMember" name="DesignBuildContractorMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_PassThroughJointVentureMember" name="PassThroughJointVentureMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_AecomUsaInc.Member" name="AecomUsaInc.Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_ConsolidatedLeverageRatio" name="ConsolidatedLeverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_NumberOfAcquisition" name="NumberOfAcquisition" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsOfAcquireeSinceAcquisitionDateActual" name="BusinessCombinationProFormaInformationAmortizationOfIntangibleAssetsOfAcquireeSinceAcquisitionDateActual" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_BusinessCombinationFairValueAdjustmentOfJointVentures" name="BusinessCombinationFairValueAdjustmentOfJointVentures" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_BusinessCombinationFairValueAdjustmentOfNoncontrollingInterests" name="BusinessCombinationFairValueAdjustmentOfNoncontrollingInterests" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_BusinessCombinationRecognizedMarginFairValueLiability" name="BusinessCombinationRecognizedMarginFairValueLiability" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_DebtInstrumentFinancialCovenantsMaximumConsolidatedLeverageRatio" name="DebtInstrumentFinancialCovenantsMaximumConsolidatedLeverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_ConsolidatedInterestCoverageRatio" name="ConsolidatedInterestCoverageRatio" nillable="true" type="xbrli:pureItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_NotionalAmountOfForeignCurrencyDerivativeExchangeContracts" name="NotionalAmountOfForeignCurrencyDerivativeExchangeContracts" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_BusinessCombinationNumberOfContingentConsiderationAgreements" name="BusinessCombinationNumberOfContingentConsiderationAgreements" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_LossContingencySuretyBondsIssued" name="LossContingencySuretyBondsIssued" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_ProceedsFromAdjustmentsToPurchasePriceInBusinessAcquisition" name="ProceedsFromAdjustmentsToPurchasePriceInBusinessAcquisition" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_CashAcquiredFromConsolidationOfJointVenture" name="CashAcquiredFromConsolidationOfJointVenture" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryBlendedIncomeTaxRatePercent" name="EffectiveIncomeTaxRateReconciliationAtFederalStatutoryBlendedIncomeTaxRatePercent" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_TaxCutsAndJobsActOf2017DeferredTaxExpenseBenefitIncompleteAccountingProvisionalAmount" name="TaxCutsAndJobsActOf2017DeferredTaxExpenseBenefitIncompleteAccountingProvisionalAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_TaxCutsAndJobsAct2017ReleaseOfDeferredTaxLiabilityRelatedToUndistributedEarningsOfForeignSubsidiariesDeferredTaxExpenseBenefitIncompleteAccountingProvisionalAmount" name="TaxCutsAndJobsAct2017ReleaseOfDeferredTaxLiabilityRelatedToUndistributedEarningsOfForeignSubsidiariesDeferredTaxExpenseBenefitIncompleteAccountingProvisionalAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_TaxCutsAndJobsActOf2017TransitionTaxOnForeignEarningsIncomeTaxExpenseBenefitIncompleteAccountingProvisionalAmount" name="TaxCutsAndJobsActOf2017TransitionTaxOnForeignEarningsIncomeTaxExpenseBenefitIncompleteAccountingProvisionalAmount" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_PaymentsForProceedsFromIntercompanyNotes" name="PaymentsForProceedsFromIntercompanyNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_ReceiptsFromJointVenturesAndOtherInvestments" name="ReceiptsFromJointVenturesAndOtherInvestments" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_InterestRateSwapFebruary2021Member" name="InterestRateSwapFebruary2021Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_InterestRateSwapSeptember2022Member" name="InterestRateSwapSeptember2022Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_InterestRateSwapFebruary2023Member" name="InterestRateSwapFebruary2023Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_ImpairmentOfIntangibleAssetsAndOtherNoncurrentAssets" name="ImpairmentOfIntangibleAssetsAndOtherNoncurrentAssets" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" name="CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" name="CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_PrepaymentPremiumOnRedemptionOfUnsecuredSeniorNote" name="PrepaymentPremiumOnRedemptionOfUnsecuredSeniorNote" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_PrepaymentPremiumOnRedemptionOfUnsecuredSeniorNotes" name="PrepaymentPremiumOnRedemptionOfUnsecuredSeniorNotes" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="acm_DebtInstrumentPrepaymentPremiumOnRedemption" name="DebtInstrumentPrepaymentPremiumOnRedemption" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
