Nature of Operations and Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Slow Moving and Obsolete Inventories (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Inventory Disclosure [Abstract]
Balance, beginning of year	$ 8,192,000	$ 5,397,000
Charged to cost of sales	2,147,000	2,966,000
Disposal of inventory, net of recoveries	(526,000)	(171,000)
Balance, end of year	$ 9,813,000	$ 8,192,000