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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill (Details) $ in Thousands | 9 Months Ended
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Oct. 29, 2017 USD ($)
Goodwill [Roll Forward] |  |
Beginning balance | $ 329,703 |
Additions (1) | 12,187 | [1]
Ending balance | 341,890 |
Signal Integrity [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 261,891 |
Additions (1) | 12,187 | [1]
Ending balance | 274,078 |
Power and High Reliability [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 49,384 |
Additions (1) | 0 | [1]
Ending balance | 49,384 |
Wireless and Sensing [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 18,428 |
Additions (1) | 0 | [1]
Ending balance | $ 18,428 |
[1] | Composed of goodwill recognized on the acquisition date and subsequent adjustments resulting from changes to the acquisition date fair values of net assets acquired in the business combination recorded during their respective measurement periods.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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