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v3.19.1

Significant Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Jan. 27, 2019 | Oct. 28, 2018 | Jul. 29, 2018 | Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 27, 2019 | Jan. 28, 2018 | Jan. 29, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 160,006 | $ 173,550 | $ 163,211 | $ 130,429 | $ 140,614 | $ 150,304 | $ 153,127 | $ 143,802 | $ 627,196 | $ 587,847 | $ 544,272
Cost of sales |  |  |  |  |  |  |  |  | 250,174 | 235,876 | 219,410
Provision for income taxes |  |  |  |  |  |  |  |  | (84) | 23,191 | 18,399
Net income | $ 13,340 | $ 12,165 | $ 25,169 | $ 12,382 | $ (1,297) | $ 13,338 | $ 12,564 | $ 11,821 | $ 63,056 | $ 36,426 | $ 54,661
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.20 | $ 0.18 | $ 0.38 | $ 0.19 | $ (0.02) | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.96 | $ 0.55 | $ 0.84
Diluted (in dollars per share) | $ 0.20 | $ 0.18 | $ 0.37 | $ 0.18 | $ (0.02) | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.92 | $ 0.54 | $ 0.83
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 9,848 |  |
Cost of sales |  |  |  |  |  |  |  |  | 2,247 |  |
Provision for income taxes |  |  |  |  |  |  |  |  | 1,596 |  |
Net income |  |  |  |  |  |  |  |  | $ 6,005 |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.09 |  |
Diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.09 |  |
Deferred revenue | $ (19,987) |  |  |  |  |  |  |  | $ (19,987) |  |

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