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Computation of Earnings Per Common Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Apr. 27, 2013
Apr. 28, 2012
Apr. 27, 2013
Apr. 28, 2012
Basic earnings per unit        
Net income $ 7,199 $ 9,645 $ 20,522 $ 26,096
Weighted-average number of common shares (in shares) 33,033,740 33,741,255 32,968,897 33,669,974
Basic earnings per common share $ 0.22 $ 0.29 $ 0.62 $ 0.78
Diluted earnings per unit        
Weighted-average number of common shares (in shares) 33,033,740 33,741,255 32,968,897 33,669,974
Potential common stock arising from stock options, and unvested restricted share units (in shares) 808,410 941,636 716,077 846,928
Total shares-diluted (in shares) 33,842,150 34,682,891 33,684,974 34,516,902
Diluted earnings per common share $ 0.21 $ 0.28 $ 0.61 $ 0.76
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 1,309,752 1,166,613 1,338,523 1,245,950