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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Revenue from Contract with Customer [Abstract] |  |
Costs on uncompleted contracts | $ 1,436,139 | $ 1,520,510
Estimated earnings to date on uncompleted contracts | 132,997 | 146,459
Costs and estimated earnings to date on uncompleted contracts | 1,569,136 | 1,666,969
Billings to date on uncompleted contracts | (1,602,014) | (1,690,175)
Net billings in excess of costs and estimated earnings on uncompleted contracts | $ (32,878) | $ (23,206)

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