Quarterly report [Sections 13 or 15(d)]

Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details)

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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]        
Costs on uncompleted contracts $ 2,912,732 $ 2,224,511    
Estimated earnings to date on uncompleted contracts 343,733 271,719    
Costs and estimated earnings to date on uncompleted contracts 3,256,465 2,496,230    
Billings to date on uncompleted contracts (3,346,280) (2,590,329)    
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (89,815) $ (94,099) $ (67,332) $ (51,609)