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Net Income Per Share (Details) - shares
shares in Thousands
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Earnings Per Share [Abstract]      
Weighted average common shares outstanding 114,423 125,914 125,693
Effect of dilutive securities — stock options 7,724 5,511 5,537
Weighted average common and dilutive potential common shares outstanding 122,147 131,425 131,230