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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares
3 Months Ended
Oct. 31, 2019
Jul. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Statement of Stockholders' Equity [Abstract]        
Cash dividends paid (in usd per share) $ 0.19 $ 0.19 $ 0.19 $ 0.17
Stock options exercised (in shares)     5,800 9,250