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Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings (Detail) - USD ($)
Jun. 30, 2022
Sep. 30, 2021
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs incurred on uncompleted contracts $ 20,074,000 $ 11,483,000
Estimated earnings 6,279,000 4,395,000
Costs and estimated earnings on uncompleted contracts 26,353,000 15,878,000
Billings to date 24,987,000 13,975,000
Costs and estimated earnings in excess of billings $ 1,366,000 $ 1,903,000