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Selected Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | May 01, 2016 | Jan. 28, 2018 | Jan. 29, 2017 | Jan. 31, 2016
Selected Quarterly Financial Data (in Dollars) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 140,614 | $ 150,304 | $ 153,127 | $ 143,802 | $ 140,031 | $ 137,185 | $ 135,911 | $ 131,145 | $ 587,847 | $ 544,272 | $ 490,219
Gross profit | 85,401 | 89,419 | 92,236 | 84,915 | 83,498 | 81,065 | 81,775 | 78,524 | 351,971 | 324,862 | 293,110
Operating income | 14,009 | 17,579 | 18,892 | 18,256 | 15,288 | 39,099 | 16,427 | 13,267 | 68,736 | 84,081 | 29,999
Net income (loss) | $ (1,297) | $ 13,338 | $ 12,564 | $ 11,821 | $ 8,020 | $ 30,776 | $ 8,978 | $ 6,887 | $ 36,426 | $ 54,661 | $ 11,497
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.02) | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.12 | $ 0.47 | $ 0.14 | $ 0.11 | $ 0.55 | $ 0.84 | $ 0.18
Diluted (in dollars per share) | $ (0.02) | $ 0.20 | $ 0.19 | $ 0.18 | $ 0.12 | $ 0.46 | $ 0.14 | $ 0.11 | $ 0.54 | $ 0.83 | $ 0.17
Weighted average number of shares used in computing earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 66,310 | 66,194 | 65,763 | 65,839 | 65,716 | 65,549 | 65,299 | 65,144 | 66,027 | 65,427 | 65,657
Diluted (in shares) | 66,310 | 67,817 | 67,470 | 67,376 | 66,757 | 66,206 | 65,905 | 65,552 | 67,605 | 66,109 | 65,961

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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