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Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2018
May 31, 2017
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year   $ 6,965  
Change in Fair Value $ 136 789 $ (1,936)
Payments   (2,296)  
Contingent consideration liability at end of quarter 5,458 5,458  
Robert Gregory Partners, LLC [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year   913  
Change in Fair Value   583  
Payments    
Contingent consideration liability at end of quarter 1,496 1,496  
Jhana Education [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year   6,052  
Change in Fair Value   206  
Payments   (2,296)  
Contingent consideration liability at end of quarter $ 3,962 $ 3,962