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Net Income Per Share (Details Textual)
3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Net Income Per Share [Abstract]        
Stock options excluded from the calculation of dilutive earnings per share 4,973,398 209,914 3,240,098 308,641