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Stockholders' Equity (Restricted Stock Activity) (Details)
12 Months Ended
Aug. 31, 2021
$ / shares
shares
Shares  
Outstanding as of beginning of period (in shares) 6,337,524
Changes during the period  
Shares granted (in shares) 2,304,115
Shares vested (in shares) (2,290,104)
Shares forfeited (in shares) (442,404)
Outstanding as of end of period (in shares) 5,909,131
Weighted- Average Grant-Date Fair Value  
Outstanding as of beginning of period (in dollars per share) | $ / shares $ 32.64
Changes during the period  
Shares granted (in dollars per share) | $ / shares 40.11
Shares vested (in dollars per share) | $ / shares 30.17
Shares forfeited (in dollars per share) | $ / shares 32.38
Outstanding as of end of period (in dollars per share) | $ / shares $ 36.51
Time-based restricted stock units  
Changes during the period  
Restricted stock units awarded (in shares) 1,200,000
Performance-based restricted stock units  
Changes during the period  
Restricted stock units awarded (in shares) 400,000
Market-based restricted stock units  
Changes during the period  
Restricted stock units awarded (in shares) 300,000