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Computation of Earnings Per Common Share - Basic and Diluted Earnings Calculation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 26, 2019
Oct. 27, 2018
Oct. 26, 2019
Oct. 27, 2018
Basic earnings per unit        
Net income $ 24,229 $ 27,830 $ 68,404 $ 74,961
Weighted-average number of common shares (in shares) 31,502,543 31,246,591 31,480,759 31,214,172
Basic earnings per common share (in dollars per share) $ 0.77 $ 0.89 $ 2.17 $ 2.40
Diluted earnings per unit        
Weighted-average number of common shares (in shares) 31,502,543 31,246,591 31,480,759 31,214,172
Potential common stock arising from stock options, and unvested restricted share units (in shares) 324,302 587,951 330,746 605,992
Potential shares of common stock issuable on exercise of convertible senior notes 0 0 0 245,065
Total shares-diluted (in shares) 31,826,845 31,834,542 31,811,505 32,065,229
Diluted earnings per common share (in dollars per share) $ 0.76 $ 0.87 $ 2.15 $ 2.34
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 10,251,008 10,133,190 10,267,737 9,834,798
Stock-based awards        
Diluted earnings per unit        
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 239,540 121,722 256,269 68,395
Convertible senior notes        
Diluted earnings per unit        
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 5,005,734 5,005,734 5,005,734 4,760,669
Warrants        
Diluted earnings per unit        
Anti-dilutive weighted shares excluded from the calculation of earnings per share (in shares) 5,005,734 5,005,734 5,005,734 5,005,734