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Reportable Segments and Geographic Information - Summarized financial information (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
USD ($)
segment
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Summarized financial information concerning the Company's reportable segments      
Number of reportable segments | segment 3    
Revenue $ 16,105,498 $ 14,378,461 $ 13,148,182
Gross profit 1,084,341 945,465 847,974
Equity in earnings of joint ventures 2,124 (279,352) 53,640
General and administrative expenses (160,105) (153,575) (147,309)
Restructuring costs (98,918) (188,404) (107,501)
Operating income 827,442 324,134 646,804
Segment assets 12,061,669 11,233,398  
Total      
Summarized financial information concerning the Company's reportable segments      
Revenue 16,105,500 14,378,500 13,148,200
Gross profit 1,084,300 945,500 848,000
Equity in earnings of joint ventures 2,100 (279,400) 53,600
General and administrative expenses (160,100) (153,600) (147,300)
Restructuring costs (98,900) (188,400) (107,500)
Operating income $ 827,400 $ 324,100 $ 646,800
Gross profit as a % of revenue 6.70% 6.60% 6.40%
Operating Segments | Americas      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 12,485,700 $ 10,975,700 $ 9,939,300
Gross profit 759,100 699,700 639,900
Equity in earnings of joint ventures 15,500 14,900 13,900
Operating income 774,600 714,600 653,800
Segment assets $ 7,988,100 $ 7,433,100 $ 7,232,200
Gross profit as a % of revenue 6.10% 6.40% 6.40%
Operating Segments | International      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 3,618,400 $ 3,402,100 $ 3,206,700
Gross profit 323,800 245,100 205,900
Equity in earnings of joint ventures 13,500 9,600 15,300
Operating income 337,300 254,700 221,200
Segment assets $ 2,734,500 $ 2,536,200 $ 2,467,900
Gross profit as a % of revenue 8.90% 7.20% 6.40%
Operating Segments | AECOM Capital      
Summarized financial information concerning the Company's reportable segments      
Revenue $ 1,400 $ 700 $ 2,200
Gross profit 1,400 700 2,200
Equity in earnings of joint ventures (26,900) (303,900) 24,400
General and administrative expenses (15,000) (12,600) (12,600)
Operating income (40,500) (315,800) 14,000
Segment assets 53,200 64,500 264,900
Corporate      
Summarized financial information concerning the Company's reportable segments      
General and administrative expenses (145,100) (141,000) (134,700)
Restructuring costs (98,900) (188,400) (107,500)
Operating income (244,000) (329,400) (242,200)
Segment assets $ 1,208,700 $ 1,104,400 $ 1,095,300