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Reportable Segments - Summarized financial information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
segment
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Summarized financial information concerning the Company's reportable segments          
Revenue $ 3,943,833 $ 3,490,172 $ 7,843,753 $ 6,872,527  
Gross profit 261,174 228,094 $ 505,144 443,082  
Number of reportable segments | segment     3    
Equity in earnings of joint ventures 19,459 7,456 $ (9,482) 17,285  
General and administrative expenses (44,686) (34,147) (80,410) (69,759)  
Restructuring costs (35,465) (3,973) (51,645) (41,432)  
Operating income (loss) 200,482 197,430 363,607 349,176  
Segment assets 11,457,393   11,457,393   $ 11,233,398
Total          
Summarized financial information concerning the Company's reportable segments          
Revenue 3,943,900 3,490,100 7,843,800 6,872,500  
Gross profit 261,100 228,100 505,100 443,100  
Equity in earnings of joint ventures 19,500 7,500 (9,500) 17,300  
General and administrative expenses (44,700) (34,200) (80,400) (69,800)  
Restructuring costs (35,400) (3,900) (51,600) (41,400)  
Operating income (loss) $ 200,500 $ 197,500 $ 363,600 $ 349,200  
Gross profit as a % of revenue 6.60% 6.50% 6.40% 6.40%  
Operating Segments | Americas          
Summarized financial information concerning the Company's reportable segments          
Revenue $ 3,038,600 $ 2,630,200 $ 6,077,300 $ 5,209,500  
Gross profit 184,400 173,300 355,400 336,200  
Equity in earnings of joint ventures 4,800 4,900 8,400 5,800  
Operating income (loss) $ 189,200 $ 178,200 $ 363,800 $ 342,000  
Gross profit as a % of revenue 6.10% 6.60% 5.80% 6.50%  
Segment assets $ 7,754,400   $ 7,754,400   7,433,100
Operating Segments | International          
Summarized financial information concerning the Company's reportable segments          
Revenue 904,800 $ 859,800 1,765,800 $ 1,662,600  
Gross profit 76,200 54,700 149,000 106,500  
Equity in earnings of joint ventures 5,000 5,400 9,300 8,700  
Operating income (loss) $ 81,200 $ 60,100 $ 158,300 $ 115,200  
Gross profit as a % of revenue 8.40% 6.40% 8.40% 6.40%  
Segment assets $ 2,671,400   $ 2,671,400   2,536,200
Operating Segments | AECOM Capital          
Summarized financial information concerning the Company's reportable segments          
Revenue 500 $ 100 700 $ 400  
Gross profit 500 100 700 400  
Equity in earnings of joint ventures 9,700 (2,800) (27,200) 2,800  
General and administrative expenses (9,700) (2,900) (12,100) (5,600)  
Operating income (loss) 500 (5,600) (38,600) (2,400)  
Segment assets 53,200   53,200   64,500
Corporate          
Summarized financial information concerning the Company's reportable segments          
General and administrative expenses (35,000) (31,300) (68,300) (64,200)  
Restructuring costs (35,400) (3,900) (51,600) (41,400)  
Operating income (loss) (70,400) $ (35,200) (119,900) $ (105,600)  
Segment assets $ 873,300   $ 873,300   $ 1,104,400