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Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Statement Of Stockholders Equity [Abstract]        
Cash dividends per share $ 0.32 $ 0.31 $ 0.64 $ 0.62