Annual report pursuant to Section 13 and 15(d)

Contract Assets and Liabilities - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings (Details)

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Contract Assets and Liabilities - Reconciliation of Net Billings in Excess of Costs and Estimated Earnings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts    
Contract asset, beginning balance $ 27,296 $ 29,271
Changes in revenue billed, contract price or cost estimates (1,330) (1,975)
Contract asset, ending balance 25,966 27,296
Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts    
Contract liability, beginning balance (78,905) (52,477)
Changes in revenue billed, contract price or cost estimates (41,160) (26,428)
Contract liability, ending balance (120,065) (78,905)
Net Billings in Excess of Costs and Estimated Earnings on Uncompleted Contracts    
Net billings in excess of costs, beginning balance (51,609) (23,206)
Changes in revenue billed, contract price or cost estimates (42,490) (28,403)
Net billings in excess of costs, ending balance $ (94,099) $ (51,609)