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Segment Information - Revenue by Product Line (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 26, 2020 | Apr. 28, 2019
Revenue from External Customer [Line Items] |  |
Net sales | $ 132,702 | $ 131,354
Signal Integrity |  |
Revenue from External Customer [Line Items] |  |
Net sales | 59,929 | 50,257
Wireless and Sensing |  |
Revenue from External Customer [Line Items] |  |
Net sales | 32,958 | 42,207
Protection |  |
Revenue from External Customer [Line Items] |  |
Net sales | $ 39,815 | $ 38,890
Net sales |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Net sales | Signal Integrity |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 45.00% | 38.00%
Net sales | Wireless and Sensing |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 25.00% | 32.00%
Net sales | Protection |  |
Revenue from External Customer [Line Items] |  |
Concentration risk, percentage | 30.00% | 30.00%

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