0000001 - Document - COVER link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - STATEMENT OF NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS link:presentationLink link:calculationLink link:definitionLink 0000004 - Disclosure - DESCRIPTION OF THE PLAN link:presentationLink link:calculationLink link:definitionLink 0000005 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 0000006 - Disclosure - FAIR VALUE MEASUREMENTS link:presentationLink link:calculationLink link:definitionLink 0000007 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS VANGUARD MASTER TRUST link:presentationLink link:calculationLink link:definitionLink 0000008 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS SMA MASTER TRUST link:presentationLink link:calculationLink link:definitionLink 0000009 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS STABLE VALUE MASTER TRUST link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - BENEFITS PAYABLE link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - RELATED PARTY TRANSACTIONS link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - PLAN TERMINATION link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - TAX STATUS link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - RISKS AND UNCERTAINTIES link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Employee Benefit Plan, Schedule, Reportable Transaction link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - FAIR VALUE MEASUREMENTS (Tables) link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS VANGUARD MASTER TRUST (Tables) link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS SMA MASTER TRUST (Tables) link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS STABLE VALUE MASTER TRUST (Tables) link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 (Tables) link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - DESCRIPTION OF THE PLAN (Details) link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - SIGNIFICANT ACCOUNTING POLICIES (Details) link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - FAIR VALUE MEASUREMENTS - Fair Value of Investments (Details) link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - FAIR VALUE MEASUREMENTS - Investments Measured at NAV per share (Details) link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS VANGUARD MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS VANGUARD MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS SMA MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS SMA MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS STABLE VALUE MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - INVESTMENT IN AECOM DC RETIREMENT PLANS STABLE VALUE MASTER TRUST (Details) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - BENEFITS PAYABLE (Details) link:presentationLink link:calculationLink link:definitionLink 0000035 - Disclosure - RELATED PARTY TRANSACTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 (Details) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - SCHEDULE OF DELINQUENT PARTICIPANT CONTRIBUTIONS (Details) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) link:presentationLink link:calculationLink link:definitionLink