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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Consolidated Statements of Comprehensive Income                      
Net (loss) income $ (448,000) $ 105,400 $ 93,500 $ 65,100 $ 105,400 $ 75,100 $ (107,700) $ 124,400 $ (183,990) $ 197,127 $ 421,476
Other comprehensive (loss) income, net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 (13,972) 1,693 4,605
Foreign currency translation adjustments                 (46,628) (82,717) 65,389
Pension adjustments, net of tax                 (100,367) 79,523 87,061
Other comprehensive (loss) income, net of tax                 (160,967) (1,501) 157,055
Comprehensive (loss) income, net of tax                 (344,957) 195,626 578,531
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (76,960) (61,827) (82,220)
Comprehensive (loss) income attributable to AECOM, net of tax                 (421,917) 133,799 496,311
Eliminations                      
Consolidated Statements of Comprehensive Income                      
Net (loss) income                 (27,600) (668,100) (693,400)
Other comprehensive (loss) income, net of tax:                      
Comprehensive (loss) income, net of tax                 (27,600) (668,100) (693,400)
Comprehensive (loss) income attributable to AECOM, net of tax                 (27,600) (668,100) (693,400)
Parent | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income                      
Net (loss) income                 (261,100) 136,700 339,200
Other comprehensive (loss) income, net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 (7,400) 2,300 4,900
Pension adjustments, net of tax                 (15,800) 5,000 7,100
Other comprehensive (loss) income, net of tax                 (23,200) 7,300 12,000
Comprehensive (loss) income, net of tax                 (284,300) 144,000 351,200
Comprehensive (loss) income attributable to AECOM, net of tax                 (284,300) 144,000 351,200
Guarantor Subsidiaries | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income                      
Net (loss) income                 67,300 450,700 440,000
Other comprehensive (loss) income, net of tax:                      
Pension adjustments, net of tax                 (41,200) 10,800 13,800
Other comprehensive (loss) income, net of tax                 (41,200) 10,800 13,800
Comprehensive (loss) income, net of tax                 26,100 461,500 453,800
Comprehensive (loss) income attributable to AECOM, net of tax                 26,100 461,500 453,800
Non-Guarantor Subsidiaries | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income                      
Net (loss) income                 37,400 277,900 335,700
Other comprehensive (loss) income, net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 (6,600) (600) (300)
Foreign currency translation adjustments                 (46,600) (82,700) 65,400
Pension adjustments, net of tax                 (43,400) 63,700 66,100
Other comprehensive (loss) income, net of tax                 (96,600) (19,600) 131,200
Comprehensive (loss) income, net of tax                 (59,200) 258,300 466,900
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (76,900) (61,900) (82,200)
Comprehensive (loss) income attributable to AECOM, net of tax                 (136,100) 196,400 384,700
Total                      
Consolidated Statements of Comprehensive Income                      
Net (loss) income                 (184,000) 197,200 421,500
Other comprehensive (loss) income, net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 (14,000) 1,700 4,600
Foreign currency translation adjustments                 (46,600) (82,700) 65,400
Pension adjustments, net of tax                 (100,400) 79,500 87,000
Other comprehensive (loss) income, net of tax                 (161,000) (1,500) 157,000
Comprehensive (loss) income, net of tax                 (345,000) 195,700 578,500
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (76,900) (61,900) (82,200)
Comprehensive (loss) income attributable to AECOM, net of tax                 $ (421,900) $ 133,800 $ 496,300