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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Aug. 31, 2021
Aug. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 10,000,000 10,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 267,418,092 263,830,270
Common stock, shares outstanding (in shares) 144,496,077 150,330,358
Treasury stock (in shares) 122,922,015 113,499,912