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Net Income Per Share (Details) - shares
shares in Thousands
3 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Earnings Per Share [Abstract]    
Weighted average common shares outstanding 112,718 120,155
Effect of dilutive securities - stock options 6,161 6,989
Weighted average common and dilutive potential common shares outstanding 118,879 127,144