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Reportable Segments and Geographic Information - Summarized financial information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Summarized financial information concerning the Company's reportable segments      
Revenue $ 14,378,461 $ 13,148,182 $ 13,340,852
Gross profit 945,465 847,974 798,421
Equity in earnings of joint ventures (279,352) 53,640 35,044
General and administrative expenses (153,575) (147,309) (155,072)
Restructuring costs (188,404) (107,501) (48,840)
Operating income 324,134 646,804 629,553
Segment assets 11,233,398 11,139,315  
Total      
Summarized financial information concerning the Company's reportable segments      
Revenue 14,378,500 13,148,200 13,340,900
Gross profit 945,500 848,000 798,400
Equity in earnings of joint ventures (279,400) 53,600 35,000
General and administrative expenses (153,600) (147,300) (155,000)
Restructuring costs (188,400) (107,500) (48,800)
Operating income $ 324,100 $ 646,800 $ 629,600
Gross profit as a % of revenue 6.60% 6.40% 6.00%
Operating Segments | Americas      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 10,975,700 $ 9,939,300 $ 10,226,300
Gross profit 699,700 639,900 631,600
Equity in earnings of joint ventures 14,900 13,900 11,400
Operating income 714,600 653,800 643,000
Segment assets $ 7,433,100 $ 7,232,200 $ 7,204,600
Gross profit as a % of revenue 6.40% 6.40% 6.20%
Operating Segments | International      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 3,402,100 $ 3,206,700 $ 3,112,600
Gross profit 245,100 205,900 164,800
Equity in earnings of joint ventures 9,600 15,300 12,200
Operating income 254,700 221,200 177,000
Segment assets $ 2,536,200 $ 2,467,900 $ 2,764,500
Gross profit as a % of revenue 7.20% 6.40% 5.30%
Operating Segments | AECOM Capital      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 700 $ 2,200 $ 2,000
Gross profit 700 2,200 2,000
Equity in earnings of joint ventures (303,900) 24,400 11,400
General and administrative expenses (12,600) (12,600) (11,100)
Operating income (315,800) 14,000 2,300
Segment assets 64,500 264,900 234,600
Corporate      
Summarized financial information concerning the Company's reportable segments      
General and administrative expenses (141,000) (134,700) (143,900)
Restructuring costs (188,400) (107,500) (48,800)
Operating income (329,400) (242,200) (192,700)
Segment assets $ 1,104,400 $ 1,095,300 $ 1,390,900