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Segment Information - Revenue by Product Line (Details) - USD ($) | 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 | $ 150,304,000 | $ 137,185,000 | $ 447,233,000 | $ 404,241,000
Signal Integrity [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 63,921,000 | 60,550,000 | 198,645,000 | 193,745,000
Protection [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 49,366,000 | 40,250,000 | 136,673,000 | 108,296,000
Wireless and Sensing [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 31,146,000 | 24,070,000 | 92,378,000 | 60,514,000
Power and High Reliability [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 12,120,000 | 15,984,000 | 34,263,000 | 45,150,000
Systems Innovation [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales | 0 | 0 | 0 | 205,000
Other: Warrant Shares [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net sales offset | $ (6,249,000) | $ (3,669,000) | $ (14,726,000) | $ (3,669,000)
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% | 43.00% | 48.00%
Net sales [Member] | Protection [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 33.00% | 29.00% | 31.00% | 27.00%
Net sales [Member] | Wireless and Sensing [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 21.00% | 18.00% | 21.00% | 15.00%
Net sales [Member] | Power and High Reliability [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 8.00% | 12.00% | 8.00% | 11.00%
Net sales [Member] | Systems Innovation [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | 0.00% | 0.00% | 0.00% | 0.00%
Net sales [Member] | Other: Warrant Shares [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Concentration risk, percentage | (4.00%) | (3.00%) | (3.00%) | (1.00%)

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