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Goodwill and Intangible Assets (Tables) | 6 Months Ended
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Jul. 29, 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 | — |  |  | — |  |  | 4,834 |  |  | 4,834 |
Balance at July 29, 2018 | $ | 274,085 |  |  | $ | 67,812 |  |  | $ | 4,834 |  |  | $ | 346,731 |
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:
|  |  | July 29, 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 |  |  | $ | (126,203 | ) |  | $ | 38,727 |  |  | $ | 164,930 |  |  | $ | (115,628 | ) |  | $ | 49,302 |
Customer relationships | 3-10 years |  | 34,031 |  |  | (28,292 | ) |  | 5,739 |  |  | 34,031 |  |  | (25,426 | ) |  | 8,605 |
Total finite-lived intangible assets |  |  | $ | 198,961 |  |  | $ | (154,495 | ) |  | $ | 44,466 |  |  | $ | 198,961 |  |  | $ | (141,054 | ) |  | $ | 57,907 |
Amortization expenses recorded in the Statements of Income for each period were as follows:
| Three Months Ended |  | Six Months Ended
(in thousands) | July 29, 2018 |  | July 30, 2017 |  | July 29, 2018 |  | July 30, 2017
Core technologies | $ | 5,047 |  |  | $ | 5,464 |  |  | $ | 10,575 |  |  | $ | 10,650 |
Customer relationships | 1,433 |  |  | 1,211 |  |  | 2,866 |  |  | 2,311 |
Total amortization expense | $ | 6,480 |  |  | $ | 6,675 |  |  | $ | 13,441 |  |  | $ | 12,961 |
Schedule of Indefinite-Lived Intangible Assets | The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to IPR&D:
(in thousands) | Net Carrying Value
Value at January 28, 2018 | $ | 2,300 |
In-process research and development through acquisitions | — |
Value at July 29, 2018 | $ | 2,300 |

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