Revenue Recognition and Related Costs - Additional Information (Detail) - USD ($)	9 Months Ended
	Jun. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Amortization period for incremental costs	1 year
Costs and estimated earnings in excess of billings	$ 2,700,000	$ 1,508,000
Contract assets collection period	1 year
Accounts receivable related to contracts with customers	$ 153,000	114,000
Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Customer deposits related to contracts with customers	$ 2,560,000	$ 6,815,000