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Segment Information - Revenue by Product Line (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 29, 2018 | Jul. 30, 2017 | Jul. 29, 2018 | Jul. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Net sales | $ 163,211,000 | $ 153,127,000 | $ 293,640,000 | $ 296,929,000
Signal Integrity [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 68,802,000 | 66,666,000 | 134,401,000 | 134,724,000
Protection [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 45,999,000 | 45,058,000 | 86,791,000 | 87,307,000
Wireless and Sensing [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 48,410,000 | 44,600,000 | 93,949,000 | 83,375,000
Other: Warrant Shares |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales offset | $ 0 | $ (3,197,000) | $ (21,501,000) | $ (8,477,000)
Net sales [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00% | 100.00%
Net sales [Member] | Signal Integrity [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 42.00% | 44.00% | 45.00% | 46.00%
Net sales [Member] | Protection [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 28.00% | 29.00% | 30.00% | 29.00%
Net sales [Member] | Wireless and Sensing [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 30.00% | 29.00% | 32.00% | 28.00%
Net sales [Member] | Other: Warrant Shares |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | (0.00%) | (2.00%) | (7.00%) | (3.00%)

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