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Segment Information - Revenue by Product Line (Details) - USD ($) | 3 Months Ended
--- | ---
Apr. 29, 2018 | Apr. 30, 2017
Revenue from External Customer [Line Items] |  |
Net sales | $ 130,429,000 | $ 143,802,000
Signal Integrity [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 65,599,000 | 68,058,000
Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 40,792,000 | 42,249,000
Wireless and Sensing [Member] |  |
Revenue from External Customer [Line Items] |  |
Net sales | 45,539,000 | 38,775,000
Other: Warrant Shares |  |
Revenue from External Customer [Line Items] |  |
Net sales offset | $ (21,501,000) | $ (5,280,000)
Net sales [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Net sales [Member] | Signal Integrity [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 50.00% | 49.00%
Net sales [Member] | Protection [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 31.00% | 29.00%
Net sales [Member] | Wireless and Sensing [Member] |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 35.00% | 26.00%
Net sales [Member] | Other: Warrant Shares |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | (16.00%) | (4.00%)

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