Annual report pursuant to Section 13 and 15(d)

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

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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Contractors [Abstract]    
Costs on uncompleted contracts $ 876,229 $ 900,880
Estimated earnings to date on uncompleted contracts 101,055 123,256
Costs and estimated earnings to date on uncompleted contracts 977,284 1,024,136
Billings to date on uncompleted contracts (1,003,115) (1,043,221)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ 25,831 $ 19,085