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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Revenue from Contract with Customer [Abstract] |  |
Costs on uncompleted contracts | $ 905,840 | $ 900,880
Estimated earnings to date on uncompleted contracts | 114,593 | 123,256
Costs and estimated earnings to date on uncompleted contracts | 1,020,433 | 1,024,136
Billings to date on uncompleted contracts | (1,033,872) | (1,043,221)
Net billings in excess of costs and estimated earnings on uncompleted contracts | $ (13,439) | $ (19,085)

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