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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, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Business Acquisition, Contingent Consideration [Line Items]        
Contingent consideration liability at beginning of year     $ 4,548  
Change in Fair Value $ 1,069 $ 136 1,145 $ 789
Payments     (483)  
Contingent consideration liability at end of quarter 5,210   5,210  
Robert Gregory Partners [Member]        
Business Acquisition, Contingent Consideration [Line Items]        
Contingent consideration liability at beginning of year     606  
Change in Fair Value 1,100   1,096  
Payments      
Contingent consideration liability at end of quarter 1,702   1,702  
Jhana Education [Member]        
Business Acquisition, Contingent Consideration [Line Items]        
Contingent consideration liability at beginning of year     3,942  
Change in Fair Value     49  
Payments     (483)  
Contingent consideration liability at end of quarter $ 3,508   $ 3,508