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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022
Loss Contingencies [Line Items] |  |
Loss Contingency, Discounted Amount of Insurance-related Assessment Liability | $ 7,726 | $ 7,693
Letters of Credit Outstanding, Amount | 4,166 |
Estimated cost of completion of bonded projects | 151,186 |
Purchase Commitment, Remaining Minimum Amount Committed | 0 |
Loss Contingency Accrual | 10,451 |
Loss Contingency, Loss in Period | 3,095 |
Insurance Related [Member] |  |
Loss Contingencies [Line Items] |  |
Letters of Credit Outstanding, Amount | $ 4,166 | $ 3,878

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