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Commitments And Contingencies (Narrative) (Details) - USD ($)
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Loss Contingencies [Line Items]      
Rent expense $ 1,800,000 $ 2,000,000.0 $ 2,100,000
Purchase Commitment [Member]      
Loss Contingencies [Line Items]      
Commitment outstanding 0    
Indemnification Agreement 1 [Member]      
Loss Contingencies [Line Items]      
Liabilities related to indemnification agreement 0    
Senior Officers And Directors [Member] | Indemnification Agreement 1 [Member]      
Loss Contingencies [Line Items]      
Liabilities related to indemnification agreement $ 0