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Condensed Consolidating Financial Information - Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Consolidated Statements of Comprehensive Income (Loss)                      
Net income $ 105,400 $ 75,100 $ (107,700) $ 124,400 $ 103,800 $ 136,100 $ 115,800 $ 65,800 $ 197,127 $ 421,476 $ 163,472
Other comprehensive income (loss), net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 1,693 4,605 5,987
Foreign currency translation adjustments                 (82,717) 65,389 (65,224)
Pension adjustments, net of tax                 79,523 87,061 (164,911)
Other comprehensive (loss) income, net of tax                 (1,501) 157,055 (224,148)
Comprehensive income, net of tax                 195,626 578,531 (60,676)
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (61,827) (82,220) (65,697)
Comprehensive income (loss) attributable to AECOM, net of tax                 133,799 496,311 (126,373)
Eliminations                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net income                 (668,100) (693,400) (717,400)
Other comprehensive income (loss), net of tax:                      
Comprehensive income, net of tax                 (668,100) (693,400) (717,400)
Comprehensive income (loss) attributable to AECOM, net of tax                 (668,100) (693,400) (717,400)
Parent | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net income                 136,700 339,200 96,200
Other comprehensive income (loss), net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 2,300 4,900 2,600
Pension adjustments, net of tax                 5,000 7,100 (3,300)
Other comprehensive (loss) income, net of tax                 7,300 12,000 (700)
Comprehensive income, net of tax                 144,000 351,200 95,500
Comprehensive income (loss) attributable to AECOM, net of tax                 144,000 351,200 95,500
Guarantor Subsidiaries | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net income                 450,700 440,000 484,800
Other comprehensive income (loss), net of tax:                      
Pension adjustments, net of tax                 10,800 13,800 (14,900)
Other comprehensive (loss) income, net of tax                 10,800 13,800 (14,900)
Comprehensive income, net of tax                 461,500 453,800 469,900
Comprehensive income (loss) attributable to AECOM, net of tax                 461,500 453,800 469,900
Non-Guarantor Subsidiaries | Reportable Legal Entities                      
Consolidated Statements of Comprehensive Income (Loss)                      
Net income                 277,900 335,700 299,900
Other comprehensive income (loss), net of tax:                      
Net unrealized gain (loss) on derivatives, net of tax                 (600) (300) 3,400
Foreign currency translation adjustments                 (82,700) 65,400 (65,300)
Pension adjustments, net of tax                 63,700 66,100 (146,700)
Other comprehensive (loss) income, net of tax                 (19,600) 131,200 (208,600)
Comprehensive income, net of tax                 258,300 466,900 91,300
Noncontrolling interests in comprehensive income of consolidated subsidiaries, net of tax                 (61,900) (82,200) (65,700)
Comprehensive income (loss) attributable to AECOM, net of tax                 $ 196,400 $ 384,700 $ 25,600