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Consolidated Statements of Equity (Parenthetical) - $ / shares
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
2.875% Convertible senior notes, due 2028      
Debt instrument, interest rate 2.875%    
2.25% Convertible senior notes, due 2024      
Debt instrument, interest rate 2.25%   2.25%
2.875% Convertible senior notes, due 2024      
Debt instrument, interest rate 2.875%    
Equity Excluding Contingently Redeemable Noncontrolling Interest      
Cash dividend per share $ 1.08 $ 1.06 $ 1.00