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Joint Ventures and Variable Interest Entities - Schedule of Financial Information of Unconsolidated Joint Ventures Derived from Unaudited Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Joint Ventures and Variable Interest Entities [Line Items]        
Current assets $ 6,999,358   $ 7,176,059  
TOTAL ASSETS 11,818,827   12,061,669  
Current liabilities 6,139,555   6,374,081  
TOTAL LIABILITIES 9,419,284   9,691,259  
Joint ventures’ equity 2,399,543 $ 2,428,218 2,370,410 $ 2,383,711
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 11,818,827   12,061,669  
AECOM’s investment in unconsolidated joint ventures 144,947   138,067  
Joint ventures summarized financial information        
Revenue 4,014,152 3,899,920    
Cost of revenue 3,745,748 3,655,950    
Gross profit 268,404 243,970    
Net income 179,204 108,594    
Equity Method Investment, Nonconsolidated Investee or Group of Investees        
Joint Ventures and Variable Interest Entities [Line Items]        
Current assets 1,375,100   1,379,000  
Non-current assets 812,900   799,900  
TOTAL ASSETS 2,188,000   2,178,900  
Current liabilities 997,800   976,300  
Non-current liabilities 107,400   114,800  
TOTAL LIABILITIES 1,105,200   1,091,100  
Joint ventures’ equity 1,082,800   1,087,800  
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY 2,188,000   2,178,900  
AECOM’s investment in unconsolidated joint ventures 144,900   $ 138,100  
Joint ventures summarized financial information        
Revenue 727,700 341,600    
Cost of revenue 691,600 318,300    
Gross profit 36,100 23,300    
Net income $ 36,800 $ 22,900