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Property and Equipment - Property and Equipment (Detail) - USD ($)
Sep. 30, 2021
Sep. 30, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 38,924,000 $ 33,175,000
Less: Accumulated depreciation and amortization (27,123,000) (24,834,000)
Property and equipment, net 11,801,000 8,341,000
Land and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 3,329,000 3,323,000
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 13,830,000 13,547,000
Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 21,765,000 $ 16,305,000