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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Earnings Per Share [Abstract]    
Weighted average common shares outstanding 231,169 233,888
Effect of dilutive securities — stock options 7,493 10,938
Weighted average common and dilutive potential common shares outstanding 238,662 244,826