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Condensed Consolidating Financial Information (Details 4) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Consolidated Statements of Comprehensive Income (Loss)                      
Net (loss) income $ 26,500 $ (200) $ 20,600 $ (118,100) $ 64,700 $ 69,100 $ 42,500 $ 56,500 $ (71,233) $ 232,764 $ 243,196
Other comprehensive income (loss), net of tax:                      
Net unrealized (loss) gain on derivatives, net of tax                 (9,196) 315 1,568
Foreign currency translation adjustments                 (285,520) (72,715) (70,441)
Pension adjustments, net of tax                 12,953 (24,161) (14,582)
Other comprehensive loss, net of tax                 (281,763) (96,561) (83,455)
Comprehensive (loss) income, net of tax                 (352,996) 136,203 159,741
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (80,347) (1,652) (2,624)
Comprehensive (loss) income attributable to AECOM, net of tax                 (433,343) 134,551 157,117
Reportable Legal Entities | Parent                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net (loss) income                 (154,800) 229,900 239,300
Other comprehensive income (loss), net of tax:                      
Net unrealized (loss) gain on derivatives, net of tax                 (6,100) 300 1,600
Pension adjustments, net of tax                 1,800 (9,900) 19,100
Other comprehensive loss, net of tax                 (4,300) (9,600) 20,700
Comprehensive (loss) income, net of tax                 (159,100) 220,300 260,000
Comprehensive (loss) income attributable to AECOM, net of tax                 (159,100) 220,300 260,000
Reportable Legal Entities | Guarantor Subsidiaries                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net (loss) income                 82,200 179,600 178,800
Other comprehensive income (loss), net of tax:                      
Pension adjustments, net of tax                 6,400    
Other comprehensive loss, net of tax                 6,400    
Comprehensive (loss) income, net of tax                 88,600 179,600 178,800
Comprehensive (loss) income attributable to AECOM, net of tax                 88,600 179,600 178,800
Reportable Legal Entities | Non-Guarantor Subsidiaries                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net (loss) income                 271,200 217,700 217,300
Other comprehensive income (loss), net of tax:                      
Net unrealized (loss) gain on derivatives, net of tax                 (3,100)    
Foreign currency translation adjustments                 (285,600) (72,700) (70,500)
Pension adjustments, net of tax                 4,800 (14,300) (33,700)
Other comprehensive loss, net of tax                 (283,900) (87,000) (104,200)
Comprehensive (loss) income, net of tax                 (12,700) 130,700 113,100
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (80,300) (1,600) (2,600)
Comprehensive (loss) income attributable to AECOM, net of tax                 (93,000) 129,100 110,500
Eliminations                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net (loss) income                 (269,800) (394,400) (392,200)
Other comprehensive income (loss), net of tax:                      
Comprehensive (loss) income, net of tax                 (269,800) (394,400) (392,200)
Comprehensive (loss) income attributable to AECOM, net of tax                 $ (269,800) $ (394,400) $ (392,200)