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Fair Value Of Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Jul. 11, 2017
May 15, 2017
Contingent consideration $ 5,229 $ 4,548      
Increase (decrease) in contingent consideration liabilities 1,334 1,014 $ (1,936)    
Robert Gregory Partners [Member]          
Contingent consideration 1,761 606     $ 4,500
Increase (decrease) in contingent consideration liabilities 1,155        
Jhana Education [Member]          
Contingent consideration 3,468 $ 3,942   $ 7,200  
Increase (decrease) in contingent consideration liabilities $ 179