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Contract Assets and Liabilities - Cost and Estimated Earnings Compared to Billings on Uncompleted Contracts (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023
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Revenue from Contract with Customer [Abstract] |  |  |  |
Costs on uncompleted contracts | $ 3,405,243 | $ 2,224,511 |  |
Estimated earnings to date on uncompleted contracts | 412,813 | 271,719 |  |
Costs and estimated earnings to date on uncompleted contracts | 3,818,056 | 2,496,230 |  |
Billings to date on uncompleted contracts | (3,887,644) | (2,590,329) |  |
Net billings in excess of costs and estimated earnings on uncompleted contracts | $ (69,588) | $ (94,099) | $ (80,645) | $ (51,609)

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