Revenue Recognition and Related Costs - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Amortization period for incremental costs	1 year
Costs and estimated earnings in excess of billings	$ 1,225,000	$ 1,903,000
Contract assets collection period	1 year
Accounts receivable related to contracts with customers	$ 260,000	210,000
Current Liabilities [Member]
Disaggregation of Revenue [Line Items]
Customer deposits related to contracts with customers	$ 8,697,000	$ 5,244,000