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Concentration of Risk and Segment Data (Foreign Source Revenue) (Details)
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Foreign source revenue | Net Revenue | Geographic Concentration Risk        
Concentration Risk [Line Items]        
Concentration risk, percentage 84.70% 82.60% 84.10% 82.20%