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Segment Information - Net Sales Activity by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 29, 2017 | Oct. 30, 2016 | Oct. 29, 2017 | Oct. 30, 2016
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 150,304 | $ 137,185 | $ 447,233 | $ 404,241
Semiconductor Products Group [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 150,304 | 137,185 | 447,233 | 404,036
All others [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 0 | $ 0 | $ 0 | $ 205

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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