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Reportable Segments - Schedule of Financial Information Concerning the Company's Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Revenue $ 4,178,440 $ 4,151,251 $ 11,964,205 $ 11,995,004  
Gross profit 326,950 285,044 886,115 790,188  
Equity in earnings of joint ventures 5,290 7,647 21,707 (1,835)  
General and administrative expenses (38,163) (36,209) (118,676) (116,619)  
Restructuring costs 0 (29,025) 0 (80,670)  
Operating income (loss) 294,077 227,457 789,146 591,064  
Total assets 12,252,145   12,252,145   $ 12,061,669
Total          
Segment Reporting Information [Line Items]          
Revenue 4,178,400 4,151,200 11,964,200 11,995,000  
Gross profit 326,900 285,100 886,100 790,200  
Equity in earnings of joint ventures 5,300 7,700 21,700 (1,800)  
General and administrative expenses (38,200) (36,200) (118,700) (116,600)  
Restructuring costs 0 (29,100) 0 (80,700)  
Operating income (loss) $ 294,000 $ 227,500 $ 789,100 $ 591,100  
Gross profit as a % of revenue 7.80% 6.90% 7.40% 6.60%  
Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Revenue $ 3,277,200 $ 3,246,900 $ 9,285,900 $ 9,324,200  
Gross profit 238,800 203,900 641,500 559,300  
Equity in earnings of joint ventures 2,200 3,500 12,600 11,900  
General and administrative expenses 0 0 0 0  
Restructuring costs 0 0 0 0  
Operating income (loss) $ 241,000 $ 207,400 $ 654,100 $ 571,200  
Gross profit as a % of revenue 7.30% 6.30% 6.90% 6.00%  
Total assets $ 7,864,300   $ 7,864,300   7,988,100
Operating Segments | International          
Segment Reporting Information [Line Items]          
Revenue 901,100 $ 904,200 2,677,900 $ 2,670,000  
Gross profit 88,000 81,100 244,200 230,100  
Equity in earnings of joint ventures 2,100 3,500 9,000 12,800  
General and administrative expenses 0 0 0 0  
Restructuring costs 0 0 0 0  
Operating income (loss) $ 90,100 $ 84,600 $ 253,200 $ 242,900  
Gross profit as a % of revenue 9.80% 9.00% 9.10% 8.60%  
Total assets $ 2,830,800   $ 2,830,800   2,734,500
Operating Segments | AECOM Capital          
Segment Reporting Information [Line Items]          
Revenue 100 $ 100 400 $ 800  
Gross profit 100 100 400 800  
Equity in earnings of joint ventures 1,000 700 100 (26,500)  
General and administrative expenses (2,300) (600) (7,500) (12,700)  
Restructuring costs 0 0 0 0  
Operating income (loss) (1,200) 200 (7,000) (38,400)  
Total assets 46,800   46,800   53,200
Corporate          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Gross profit 0 0 0 0  
Equity in earnings of joint ventures 0 0 0 0  
General and administrative expenses (35,900) (35,600) (111,200) (103,900)  
Restructuring costs 0 (29,100) 0 (80,700)  
Operating income (loss) (35,900) $ (64,700) (111,200) $ (184,600)  
Total assets $ 1,493,400   $ 1,493,400   $ 1,208,700