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Commitments And Contingencies (Narrative) (Details)
3 Months Ended
Nov. 30, 2020
USD ($)
claim
Loss Contingencies [Line Items]  
Number of pending claims | claim 0
Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Commitment outstanding $ 0
Indemnification Agreement 2 [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
Minimum [Member] | Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Purchase commitment period 2 months
Maximum [Member] | Purchase Commitment [Member]  
Loss Contingencies [Line Items]  
Purchase commitment period 6 months