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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2017
Apr. 30, 2016
Earnings Per Share [Abstract]        
Weighted average common shares outstanding 229,920 221,088 228,146 234,142
Effect of dilutive securities - stock options 7,215 15,324 8,662 14,638
Weighted average common and dilutive potential common shares outstanding 237,135 236,412 236,808 248,780