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Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Mar. 27, 2015
Aug. 31, 2014
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents $ 8,924 $ 10,456 $ 16,234 $ 10,000 $ 10,483
Costs to exit Japan publishing business 2,107        
Capitalized interest expense 100        
Capitalized curriculum development spending 6,500        
Capitalized development costs 11,600 8,900      
Foreign currency transaction gains (losses) (200) (300) (1,100)    
Licensee royalty revenue 10,600 14,400 13,700    
Reclassified income taxes payable to accrued liabilities   4      
Advertising costs $ 6,400 6,600 7,400    
Percent likelihood of being realized upon ultimate settlement 50.00%        
Goodwill, impairment loss      
Held Outside The US By Foreign Subsidiaries [Member]          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalents 7,300        
Covey Trade Name [Member]          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]          
Goodwill, impairment loss $ 0 $ 0 $ 0    
Minimum [Member]          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]          
Capitalized development costs, amortization period 3 years        
Maximum [Member]          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]          
Capitalized development costs, amortization period 5 years