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Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings (Detail) - USD ($)
Jun. 30, 2023
Sep. 30, 2022
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 19,400,000 $ 12,660,000
Estimated earnings 7,143,000 4,780,000
Costs and estimated earnings on uncompleted contracts 26,543,000 17,440,000
Billings to date 19,630,000 15,322,000
Costs and estimated earnings in excess of billings $ 6,913,000 $ 2,118,000