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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Earnings Per Share [Abstract]        
Weighted average common shares outstanding 227,984 232,010 230,922 231,387
Effect of dilutive securities - stock options 9,908 10,950 10,236 9,643
Weighted average common and dilutive potential common shares outstanding 237,892 242,960 241,158 241,030