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Costs and Estimated Earnings in Excess of Billings - Costs and Estimated Earnings in Excess of Billings on Uncompleted Contracts (Detail) - USD ($)	Mar. 31, 2019	Sep. 30, 2018
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]
Costs incurred on uncompleted contracts	$ 28,723,000	$ 17,437,000
Estimated earnings	12,314,000	7,335,000
Costs and estimated earnings on uncompleted contracts	41,037,000	24,772,000
Costs and estimated earnings on uncompleted contracts	41,037,000	24,772,000
Billings to date	27,024,000	12,872,000
Costs and estimated earnings in excess of billings	$ 14,013,000	$ 11,900,000