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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
Apr. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Apr. 30, 2016
Jan. 30, 2016
Oct. 31, 2015
Aug. 01, 2015
Apr. 29, 2017
Apr. 30, 2016
May 02, 2015
Net income                      
Basic earnings per share $ 909 $ (5,127) $ 9,021 $ 5,539 $ (2,930) $ (1,953) $ 3,168 $ 3,776 $ 10,342 $ 2,061 $ 20,882
Dilution associated with stock compensation plans                 0 0 0
Diluted earnings per share                 $ 10,342 $ 2,061 $ 20,882
Shares                      
Basic earnings per share (in shares)                 44,114 43,990 43,514
Dilution associated with stock compensation plans (in shares)                 189 466 929
Diluted earnings per share (in shares)                 44,303 44,456 44,443
Per share income (loss)                      
Basic earnings per share (in dollars per share) $ 0.02 $ (0.12) $ 0.21 $ 0.13 $ (0.07) $ (0.04) $ 0.07 $ 0.09 $ 0.23 $ 0.05 $ 0.48
Dilution associated with stock compensation plans (in dollars per share)                 0.00 0.00 (0.01)
Diluted earnings per share (in dollars per share) $ 0.02 $ (0.12) $ 0.20 $ 0.13 $ (0.07) $ (0.04) $ 0.07 $ 0.09 $ 0.23 $ 0.05 $ 0.47
Stock Options                      
Antidilutive Securities Excluded from Computation of Earnings Per Share                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 2,112 2,122 1,462
Antidilutive securities excluded from computation of earnings per share, weighted average exercise price (in dollars per share)                 $ 13.30 $ 15.04 $ 18.42