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, 2021
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]    
Costs on uncompleted contracts $ 888,654 $ 876,229
Estimated earnings to date on uncompleted contracts 103,005 101,055
Costs and estimated earnings to date on uncompleted contracts 991,659 977,284
Billings to date on uncompleted contracts (1,000,427) (1,003,115)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (8,768) $ (25,831)