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Condensed Consolidating Financial Information - Operations (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
Condensed Consolidating Statements of Operations                      
Revenue $ 5,305,800 $ 5,148,000 $ 4,790,900 $ 4,910,800 $ 4,856,400 $ 4,561,500 $ 4,427,200 $ 4,358,300 $ 20,155,512 $ 18,203,402 $ 17,410,825
Cost of revenue 5,117,800 4,962,800 4,649,700 4,774,600 4,686,300 4,386,300 4,258,800 4,188,300 19,504,863 17,519,682 16,768,001
Gross profit 188,000 185,200 141,200 136,200 170,100 175,200 168,400 170,000 650,649 683,720 642,824
Equity in earnings of joint ventures 25,500 12,800 13,100 29,700 31,900 66,500 21,800 21,400 81,133 141,582 104,032
General and administrative expenses (35,700) (35,100) (30,200) (34,700) (36,900) (34,000) (29,900) (32,600) (135,787) (133,309) (115,088)
Impairment on assets held for sale, including goodwill     (168,200)           (168,178)    
Acquisition and integration expenses         (3,300)   (20,000) (15,400)   (38,709) (213,642)
(Loss) gain on disposal activities (800) (2,100)         600   (2,949) 572 (42,589)
Income from operations 177,000 160,800 (44,100) 131,200 161,800 207,700 140,900 143,400 424,868 653,856 375,537
Other income 2,600 2,700 12,500 2,300 2,500 2,100 1,300 800 20,135 6,636 8,180
Interest expense (55,500) (55,300) (100,500) (56,200) (54,300) (61,600) (61,800) (53,600) (267,519) (231,310) (258,162)
Income before income tax (benefit) expense 124,100 108,200 (132,100) 77,300 110,000 148,200 80,400 90,600 177,484 429,182 125,555
Income tax (benefit) expense 18,700 33,100 (24,400) (47,100) 6,200 12,100 (35,400) 24,800 (19,643) 7,706 (37,917)
Net income 105,400 75,100 (107,700) 124,400 103,800 136,100 115,800 65,800 197,127 421,476 163,472
Noncontrolling interests in income of consolidated subsidiaries, net of tax (21,400) (14,200) (12,000) (13,100) (15,300) (34,800) (13,400) (18,600) (60,659) (82,086) (67,363)
Net income attributable to AECOM $ 84,000 $ 60,900 $ (119,700) $ 111,300 $ 88,500 $ 101,300 $ 102,400 $ 47,200 136,468 339,390 96,109
Eliminations                      
Condensed Consolidating Statements of Operations                      
Revenue                 (110,300) (52,300) (82,000)
Cost of revenue                 (110,300) (52,300) (82,000)
Equity in earnings from subsidiaries                 (668,100) (661,700) (680,100)
Income from operations                 (668,100) (661,700) (680,100)
Other income                 (39,100) (36,500) (40,000)
Interest expense                 39,100 36,500 40,000
Income before income tax (benefit) expense                 (668,100) (661,700) (680,100)
Income tax (benefit) expense                   31,700 37,300
Net income                 (668,100) (693,400) (717,400)
Net income attributable to AECOM                 (668,100) (693,400) (717,400)
Parent | Reportable Legal Entities                      
Condensed Consolidating Statements of Operations                      
Equity in earnings from subsidiaries                 460,900 439,300 437,400
General and administrative expenses                 (124,400) (124,700) (114,000)
Acquisition and integration expenses                   (38,700) (213,600)
Income from operations                 336,500 275,900 109,800
Other income                 12,000 2,100 800
Interest expense                 (242,900) (203,700) (231,700)
Income before income tax (benefit) expense                 105,600 74,300 (121,100)
Income tax (benefit) expense                 (31,100) (264,900) (217,300)
Net income                 136,700 339,200 96,200
Net income attributable to AECOM                 136,700 339,200 96,200
Guarantor Subsidiaries | Reportable Legal Entities                      
Condensed Consolidating Statements of Operations                      
Revenue                 11,052,900 10,491,600 10,182,100
Cost of revenue                 10,757,200 10,136,100 9,864,300
Gross profit                 295,700 355,500 317,800
Equity in earnings from subsidiaries                 207,200 222,400 242,700
Equity in earnings of joint ventures                 37,200 43,800 38,400
General and administrative expenses                     (1,100)
Income from operations                 540,100 621,700 597,800
Other income                 34,500 31,900 34,700
Interest expense                 (25,100) (31,100) (29,000)
Income before income tax (benefit) expense                 549,500 622,500 603,500
Income tax (benefit) expense                 98,800 182,500 118,700
Net income                 450,700 440,000 484,800
Net income attributable to AECOM                 450,700 440,000 484,800
Non-Guarantor Subsidiaries | Reportable Legal Entities                      
Condensed Consolidating Statements of Operations                      
Revenue                 9,212,900 7,764,100 7,310,700
Cost of revenue                 8,858,000 7,435,900 6,985,700
Gross profit                 354,900 328,200 325,000
Equity in earnings of joint ventures                 43,900 97,800 65,600
General and administrative expenses                 (11,300) (8,700)  
Acquisition and integration expenses                 (168,200)    
(Loss) gain on disposal activities                 (2,900) 600 (42,600)
Income from operations                 216,400 417,900 348,000
Other income                 12,700 9,200 12,700
Interest expense                 (38,600) (33,000) (37,400)
Income before income tax (benefit) expense                 190,500 394,100 323,300
Income tax (benefit) expense                 (87,400) 58,400 23,400
Net income                 277,900 335,700 299,900
Noncontrolling interests in income of consolidated subsidiaries, net of tax                 (60,700) (82,100) (67,400)
Net income attributable to AECOM                 $ 217,200 $ 253,600 $ 232,500