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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Oct. 27, 2019
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 27, 2019 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
Additions | — |  |  | — |  |  | — |  |  | — |
Balance at October 27, 2019 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
(in thousands) | Signal Integrity |  | Wireless and Sensing |  | Protection |  | Total
Balance at January 28, 2018 | $ | 274,085 |  |  | $ | 67,812 |  |  | $ | — |  |  | $ | 341,897 |
Additions (1) (2) | — |  |  | 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 27, 2019 |  | January 27, 2019
(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 |  | $ | 83,088 |  |  | $ | (62,674 | ) |  | $ | 20,414 |  |  | $ | 167,930 |  |  | $ | (136,544 | ) |  | $ | 31,386 |
Customer relationships | 3-10 years |  | 6,000 |  |  | (4,978 | ) |  | 1,022 |  |  | 34,031 |  |  | (31,159 | ) |  | 2,872 |
Total finite-lived intangible assets |  |  | $ | 89,088 |  |  | $ | (67,652 | ) |  | $ | 21,436 |  |  | $ | 201,961 |  |  | $ | (167,703 | ) |  | $ | 34,258 |
Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows:
| Three Months Ended |  | Nine Months Ended
(in thousands) | October 27, 2019 |  | October 28, 2018 |  | October 27, 2019 |  | October 28, 2018
Core technologies | $ | 3,337 |  |  | $ | 5,047 |  |  | $ | 10,971 |  |  | $ | 15,622 |
Customer relationships | 433 |  |  | 1,433 |  |  | 1,850 |  |  | 4,299 |
Total amortization expense | $ | 3,770 |  |  | $ | 6,480 |  |  | $ | 12,821 |  |  | $ | 19,921 |
Schedule of Future Amortization of Intangible Asset | Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands) |  |  |  |  |
Fiscal Year Ending: | Core Technologies |  | Customer Relationships |  | Total
2020 (remaining three months) | $ | 3,267 |  |  | $ | 433 |  |  | $ | 3,700 |
2021 | 7,389 |  |  | 589 |  |  | 7,978 |
2022 | 4,655 |  |  | — |  |  | 4,655 |
2023 | 3,714 |  |  | — |  |  | 3,714 |
2024 | 1,389 |  |  | — |  |  | 1,389 |
Thereafter | — |  |  | — |  |  | — |
Total expected amortization expense | $ | 20,414 |  |  | $ | 1,022 |  |  | $ | 21,436 |
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 27, 2019 | $ | 2,300 |
In-process research and development through acquisitions | — |
Value at October 27, 2019 | $ | 2,300 |

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