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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended
--- | --- | --- | ---
Aug. 17, 2018 | May 02, 2018 | Oct. 27, 2019 | Oct. 28, 2018
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 351,141 | $ 341,897
Additions |  |  | 0 | 13,278
Ending balance |  |  | 351,141 | 355,175
Goodwill beginning balance |  |  | 351,141 | 341,897
Signal Integrity |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | 274,085 | 274,085
Additions |  |  | 0 | 0
Ending balance |  |  | 274,085 | 274,085
Goodwill beginning balance |  |  | 274,085 | 274,085
Wireless and Sensing |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | 72,128 | 67,812
Additions |  |  | 0 | 8,500
Ending balance |  |  | 72,128 | 76,312
Goodwill beginning balance |  |  | 72,128 | 67,812
Protection |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | 4,928 | 0
Additions |  |  | 0 | 4,778
Ending balance |  |  | 4,928 | 4,778
Goodwill beginning balance |  |  | 4,928 | $ 0
TrackNet Acquisition |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | 4,300 |
Goodwill beginning balance |  |  | 4,300 |
Purchase price | $ 8,500 |  |  |
IC Interconnect, Inc. |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Beginning balance |  |  | 4,900 |
Additions |  | $ 4,800 |  |
Goodwill beginning balance |  |  | $ 4,900 |
Cash paid to to acquire business |  | $ 7,400 |  |

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