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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Revenue from Contract with Customer [Abstract]    
Contract assets $ 136,679 $ 102,827
Contract liabilities (297,949) (287,763)
Net contract liability (161,270) (184,936)
Revenue recognized related to contract liabilities 261,200  
Retention amounts included in accounts receivable 8,100 $ 7,100
Retained amount expected to be collected in the next twelve months 8,000  
Retained amount expected to be collected $ 100