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Reportable Segments and Geographic Information - Schedule of Reportable Segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Summarized financial information concerning the Company's reportable segments      
Total assets $ 12,200,249 $ 12,061,669  
Investments in unconsolidated joint ventures 138,056 138,067  
Depreciation and amortization 175,917 178,812 $ 175,725
Total      
Summarized financial information concerning the Company's reportable segments      
Total assets 12,200,200 12,061,700  
Investments in unconsolidated joint ventures 138,100 138,100  
Depreciation and amortization (175,900) (178,800) (175,700)
Operating Segments | Americas      
Summarized financial information concerning the Company's reportable segments      
Total assets 7,866,900 7,988,100  
Investments in unconsolidated joint ventures 44,000 34,100  
Depreciation and amortization (94,300) (101,600) (100,600)
Operating Segments | International      
Summarized financial information concerning the Company's reportable segments      
Total assets 2,702,900 2,734,500  
Investments in unconsolidated joint ventures 56,600 61,100  
Depreciation and amortization (70,800) (67,200) (67,200)
Operating Segments | AECOM Capital      
Summarized financial information concerning the Company's reportable segments      
Total assets 41,600 53,200  
Investments in unconsolidated joint ventures 37,500 42,900  
Depreciation and amortization 0 0 0
Corporate and Assets Held for Sale      
Summarized financial information concerning the Company's reportable segments      
Total assets 1,588,800 1,285,900  
Investments in unconsolidated joint ventures 0 0  
Depreciation and amortization $ (10,800) $ (10,000) $ (7,900)