Quarterly report pursuant to Section 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, 2024
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Revenue from Contract with Customer [Abstract]        
Costs on uncompleted contracts $ 1,705,395 $ 1,831,106    
Estimated earnings to date on uncompleted contracts 181,298 194,760    
Costs and estimated earnings to date on uncompleted contracts 1,886,693 2,025,866    
Billings to date on uncompleted contracts (1,954,025) (2,077,475)    
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (67,332) $ (51,609) $ (32,878) $ (23,206)