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Computation of Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Oct. 25, 2014
Oct. 26, 2013
Basic earnings per unit    
Net income $ 20,807 $ 18,660
Weighted-average number of common shares (in shares) 34,010,147 33,423,678
Basic earnings per common share (usd per share) $ 0.61 $ 0.56
Diluted earnings per unit    
Weighted-average number of common shares (in shares) 34,010,147 33,423,678
Potential common stock arising from stock options, and unvested restricted share units (in shares) 1,107,526 1,215,320
Total shares-diluted (in shares) 35,117,673 34,638,998
Diluted earnings per common share (usd per share) $ 0.59 $ 0.54
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 570,749 547,154