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Net Income Per Common Share - Additional Information (Detail)
3 Months Ended 9 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive shares excluded from computation of diluted earnings per share 123,000 107,000 109,000 102,000