Property and Equipment - Property and Equipment (Detail) - USD ($)	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 43,428,000	$ 38,924,000
Less: Accumulated depreciation and amortization	(29,937,000)	(27,123,000)
Property and equipment, net	13,491,000	11,801,000
Land and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	3,329,000	3,329,000
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,578,000	13,830,000
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 26,521,000	$ 21,765,000