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Nature of Business and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
May. 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
Apr. 26, 2014
Jan. 25, 2014
Oct. 26, 2013
Jul. 27, 2013
May. 02, 2015
Apr. 26, 2014
Apr. 27, 2013
Net income                      
Basic earnings per share $ 3,839 $ 561 $ 7,737 $ 8,745 $ 1,826 $ 2,871 $ 11,790 $ 5,719 $ 20,882 $ 22,206 $ 22,779
Dilution associated with stock compensation plans                 0 0 0
Diluted earnings per share                 $ 20,882 $ 22,206 $ 22,779
Shares                      
Basic earnings per share (in shares)                 43,514 42,886 42,280
Dilution associated with stock compensation plans (in shares)                 929 876 341
Diluted earnings per share (in shares)                 44,443 43,762 42,621
Per share income (loss)                      
Basic earnings per share (in dollars per share) $ 0.09 $ 0.01 $ 0.18 $ 0.20 $ 0.04 $ 0.07 $ 0.28 $ 0.13 $ 0.48 $ 0.52 $ 0.54
Dilution associated with stock compensation plans (in dollars per share)                 (0.01) (0.01) (0.01)
Diluted earnings per share (in dollars per share) $ 0.09 $ 0.01 $ 0.18 $ 0.20 $ 0.04 $ 0.07 $ 0.27 $ 0.13 $ 0.47 $ 0.51 $ 0.53
Stock Options                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 1,462 1,564 2,672
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)                 $ 18.42 $ 18.64 $ 15.09