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Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings (Detail) - USD ($)	Dec. 31, 2022	Sep. 30, 2022
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 17,613,000	$ 12,660,000
Estimated earnings	7,155,000	4,780,000
Costs and estimated earnings on uncompleted contracts	24,768,000	17,440,000
Billings to date	19,818,000	15,322,000
Costs and estimated earnings in excess of billings	$ 4,950,000	$ 2,118,000