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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Statement of Stockholders' Equity [Abstract]          
Dividends declared (in dollars per share) $ 0.59 $ 0.53 $ 1.18 $ 1.06 $ 1.06