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Organization and Basis of Presentation (Acquisitions) (Details) - USD ($) $ in Thousands | May 02, 2018 | Jul. 28, 2019 | Jan. 27, 2019 | Jul. 29, 2018 | Jan. 28, 2018
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 351,141 | $ 351,141 | $ 346,731 | $ 341,897
IC Interconnect, Inc. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 4,900 |  |  |  |
Cash paid to to acquire business | 7,400 |  |  |  |
Tangible net assets acquired | $ 2,500 |  |  |  |

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