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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 | Jun. 30, 2019 | Sep. 30, 2018
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Revenue from Contract with Customer [Abstract] |  |
Costs on uncompleted contracts | $ 913,628 | $ 743,322
Estimated earnings to date on uncompleted contracts | 123,914 | 95,155
Costs and estimated earnings to date on uncompleted contracts | 1,037,542 | 838,477
Billings to date on uncompleted contracts | (1,055,843) | (867,881)
Net billings in excess of costs and estimated earnings on uncompleted contracts | $ (18,301) | $ (29,404)

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