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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Earnings Per Share [Abstract]        
Weighted average common shares outstanding 232,010 229,920 231,387 228,146
Effect of dilutive securities - stock options 10,950 7,215 9,643 8,662
Weighted average common and dilutive potential common shares outstanding 242,960 237,135 241,030 236,808