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Reportable Segments - Schedule of Financial Information Concerning the Company's Reportable Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Revenue $ 3,771,613 $ 3,943,833 $ 7,785,765 $ 7,843,753  
Gross profit 290,761 261,174 559,165 505,144  
Equity in earnings (losses) of joint ventures 6,864 19,459 16,417 (9,482)  
General and administrative expenses (40,054) (44,686) (80,513) (80,410)  
Restructuring costs 0 (35,465) 0 (51,645)  
Operating income (loss) 257,571 200,482 495,069 363,607  
Total assets 11,781,867   11,781,867   $ 12,061,669
Total          
Segment Reporting Information [Line Items]          
Revenue 3,771,600 3,943,900 7,785,800 7,843,800  
Gross profit 290,800 261,100 559,200 505,100  
Equity in earnings (losses) of joint ventures 6,800 19,500 16,400 (9,500)  
General and administrative expenses (40,000) (44,700) (80,500) (80,400)  
Restructuring costs 0 (35,400) 0 (51,600)  
Operating income (loss) $ 257,600 $ 200,500 $ 495,100 $ 363,600  
Gross profit as a % of revenue 7.70% 6.60% 7.20% 6.40%  
Operating Segments | Americas          
Segment Reporting Information [Line Items]          
Revenue $ 2,896,700 $ 3,038,600 $ 6,008,700 $ 6,077,300  
Gross profit 212,500 184,400 402,700 355,400  
Equity in earnings (losses) of joint ventures 4,900 4,800 10,400 8,400  
General and administrative expenses 0 0 0 0  
Restructuring costs 0 0 0 0  
Operating income (loss) $ 217,400 $ 189,200 $ 413,100 $ 363,800  
Gross profit as a % of revenue 7.30% 6.10% 6.70% 5.80%  
Total assets $ 7,799,700   $ 7,799,700   7,988,100
Operating Segments | International          
Segment Reporting Information [Line Items]          
Revenue 874,800 $ 904,800 1,776,800 $ 1,765,800  
Gross profit 78,200 76,200 156,200 149,000  
Equity in earnings (losses) of joint ventures 4,000 5,000 6,900 9,300  
General and administrative expenses 0 0 0 0  
Restructuring costs 0 0 0 0  
Operating income (loss) $ 82,200 $ 81,200 $ 163,100 $ 158,300  
Gross profit as a % of revenue 8.90% 8.40% 8.80% 8.40%  
Total assets $ 2,664,900   $ 2,664,900   2,734,500
Operating Segments | AECOM Capital          
Segment Reporting Information [Line Items]          
Revenue 100 $ 500 300 $ 700  
Gross profit 100 500 300 700  
Equity in earnings (losses) of joint ventures (2,100) 9,700 (900) (27,200)  
General and administrative expenses (2,800) (9,700) (5,200) (12,100)  
Restructuring costs 0 0 0 0  
Operating income (loss) (4,800) 500 (5,800) (38,600)  
Total assets 49,600   49,600   53,200
Corporate          
Segment Reporting Information [Line Items]          
Revenue 0 0 0 0  
Gross profit 0 0 0 0  
Equity in earnings (losses) of joint ventures 0 0 0 0  
General and administrative expenses (37,200) (35,000) (75,300) (68,300)  
Restructuring costs 0 (35,400) 0 (51,600)  
Operating income (loss) (37,200) $ (70,400) (75,300) $ (119,900)  
Total assets $ 1,245,800   $ 1,245,800   $ 1,208,700