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Basis of Presentation - Immaterial Error Corrections (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Sep. 30, 2015
Immaterial Error Corrections          
Increase in Goodwill $ 5,831,409   $ 5,831,409   $ 5,820,692
Increase in Deferred tax assets - net         250,599
Increase in Accrued expenses and other current liabilities 2,401,555   2,401,555   2,167,771
Decrease in Accounts receivable 4,620,393   4,620,393   4,841,450
Decrease in Income tax receivable 70,923   70,923   $ 81,161
Impact on Net income attributable to AECOM 67,444 $ (17,192) 88,905 $ (155,901)  
Immaterial Error Corrections | URS Corporation | Restatement Adjustment          
Immaterial Error Corrections          
Increase in Goodwill 38,000   38,000    
Increase in Deferred tax assets - net 69,300   69,300    
Increase in Accrued expenses and other current liabilities 48,200   48,200    
Decrease in Accounts receivable (5,000)   (5,000)    
Decrease in Income tax receivable (54,600)   (54,600)    
Impact on Net income attributable to AECOM $ 4,800   $ 3,300