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Nature Of Operations And Summary Of Significant Accounting Policies (Property And Equipment) (Details) - USD ($)
$ in Thousands
Aug. 31, 2021
Aug. 31, 2020
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 70,839 $ 71,070
Less accumulated depreciation (59,314) (55,347)
Property and equipment 11,525 15,723
Land And Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 1,312 1,312
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 30,059 30,038
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 915 900
Computer Hardware And Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 29,127 29,691
Furniture, Fixtures, And Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 9,426 $ 9,129