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Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Sep. 01, 2018
Aug. 31, 2016
Mar. 27, 2015
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents $ 27,699 $ 10,153 $ 8,924   $ 10,456 $ 10,000
Costs to exit Japan publishing business     2,107      
Capitalized interest expense   100 100      
Capitalized curriculum development spending 2,700          
Capitalized development costs 7,000 9,300        
Foreign currency transaction gains (losses) (200) (500) (200)      
Advertising costs $ 4,600 $ 6,900 $ 6,400      
Percent likelihood of being realized upon ultimate settlement 50.00%          
Operating lease, liabilities $ 1,400          
Operating lease, ROU asset 1,600          
Retained Earnings [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Cumulative effect of new accounting standard 3,143          
Held Outside The US By Foreign Subsidiaries [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents 10,600          
ASU 2014-09 [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Cumulative effect of new accounting standard       $ 4,100    
ASU 2014-09 [Member] | Retained Earnings [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Cumulative effect of new accounting standard       $ 3,100    
Covey Trade Name [Member]            
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]            
Goodwill, impairment loss $ 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