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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
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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

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