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Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year $ 4,548    
Increase in Fair Value 1,334 $ 1,014 $ (1,936)
Payments (653)    
Contingent consideration liability at end of year 5,229 4,548  
Robert Gregory Partners [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year 606    
Increase in Fair Value 1,155    
Contingent consideration liability at end of year 1,761 606  
Jhana Education [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Contingent consideration liability at beginning of year 3,942    
Increase in Fair Value 179    
Payments (653)    
Contingent consideration liability at end of year $ 3,468 $ 3,942