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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Oct. 28, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amounts of Goodwill | Changes in the carrying amount of goodwill by applicable reporting unit were as follows:
(in thousands) | Signal Integrity |  | Wireless and Sensing |  | Protection |  | Total
Balance at January 28, 2018 | $ | 274,085 |  |  | $ | 67,812 |  |  | $ | — |  |  | $ | 341,897 |
Additions | — |  |  | 8,500 |  |  | 4,778 |  |  | 13,278 |
Balance at October 28, 2018 | $ | 274,085 |  |  | $ | 76,312 |  |  | $ | 4,778 |  |  | $ | 355,175 |
Schedule of Finite-lived Intangible Assets Acquired | The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which continue to be amortized:
|  |  | October 28, 2018 |  | January 28, 2018
(in thousands) | Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Core technologies | 5-8 years |  | $ | 164,930 |  |  | $ | (131,250 | ) |  | $ | 33,680 |  |  | $ | 164,930 |  |  | $ | (115,628 | ) |  | $ | 49,302 |
Customer relationships | 3-10 years |  | 34,031 |  |  | (29,725 | ) |  | 4,306 |  |  | 34,031 |  |  | (25,426 | ) |  | 8,605 |
Total finite-lived intangible assets |  |  | $ | 198,961 |  |  | $ | (160,975 | ) |  | $ | 37,986 |  |  | $ | 198,961 |  |  | $ | (141,054 | ) |  | $ | 57,907 |
Amortization expenses recorded in the Statements of Income for each period were as follows:
| Three Months Ended |  | Nine Months Ended
(in thousands) | October 28, 2018 |  | October 29, 2017 |  | October 28, 2018 |  | October 29, 2017
Core technologies | $ | 5,047 |  |  | $ | 6,020 |  |  | $ | 15,622 |  |  | $ | 16,669 |
Customer relationships | 1,433 |  |  | 1,433 |  |  | 4,299 |  |  | 3,745 |
Total amortization expense | $ | 6,480 |  |  | $ | 7,453 |  |  | $ | 19,921 |  |  | $ | 20,414 |
Schedule of Indefinite-Lived Intangible Assets | The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to in-process research and development:
(in thousands) | Net Carrying Value
Value at January 28, 2018 | $ | 2,300 |
In-process research and development through acquisitions | — |
Value at October 28, 2018 | $ | 2,300 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance and exist in perpetuity, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b),(d) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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