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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Oct. 29, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amounts of Goodwill | Goodwill by applicable reporting unit is as follows:
(in thousands) | Signal Integrity |  | Power and High Reliability |  | Wireless and Sensing |  | Total
Balance at January 29, 2017 | $ | 261,891 |  |  | $ | 49,384 |  |  | $ | 18,428 |  |  | $ | 329,703 |
Additions (1) | 12,187 |  |  | — |  |  | — |  |  | 12,187 |
Balance at October 29, 2017 | $ | 274,078 |  |  | $ | 49,384 |  |  | $ | 18,428 |  |  | $ | 341,890 |
(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.
Schedule of Finite-Lived Intangible Assets | The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which continue to be amortized:
|  |  | October 29, 2017 |  | January 29, 2017
(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 |  |  | $ | (109,609 | ) |  | $ | 55,321 |  |  | $ | 144,930 |  |  | $ | (92,940 | ) |  | $ | 51,990 |
Customer relationships | 5-10 years |  | 34,030 |  |  | (23,991 | ) |  | 10,039 |  |  | 30,030 |  |  | (20,247 | ) |  | 9,783 |
Total finite-lived intangible assets |  |  | $ | 198,960 |  |  | $ | (133,600 | ) |  | $ | 65,360 |  |  | $ | 174,960 |  |  | $ | (113,187 | ) |  | $ | 61,773 |
Schedule of Finite-lived Intangible Assets Acquired | The following table sets forth the Company’s finite-lived intangible assets resulting from acquisitions:
(in thousands) | Gross Carrying Value
Value at January 29, 2017 | $ | 174,960 |
Acquired intangible assets | 24,000 |
Value at October 29, 2017 | $ | 198,960 |
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 29, 2017 | $ | — |
In-process research and development through acquisitions | 2,300 |
Value at October 29, 2017 | $ | 2,300 |

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