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Nature Of Operations And Summary Of Significant Accounting Policies (Property And Equipment) (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 64,441 $ 63,636
Less accumulated depreciation (44,711) (47,553)
Property and equipment 19,730 16,083
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 30,044 32,201
Machinery And Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 2,119 2,279
Computer Hardware And Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 22,647 18,552
Furniture, Fixtures, And Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,319 $ 9,292