Quarterly report pursuant to Section 13 or 15(d)

Costs and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail)

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Costs and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Sep. 30, 2018
Revenue from Contract with Customer [Abstract]    
Costs on uncompleted contracts $ 810,269 $ 743,322
Estimated earnings to date on uncompleted contracts 105,893 95,155
Costs and estimated earnings to date on uncompleted contracts 916,162 838,477
Billings to date on uncompleted contracts (938,224) (867,881)
Net billings in excess of costs and estimated earnings on uncompleted contracts $ (22,062) $ (29,404)