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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Apr. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amounts of Goodwill | he carrying amounts of goodwill by applicable reporting unit were as follows:
(in thousands) | Signal Integrity |  | Wireless and Sensing |  | Protection |  | Total
Balance at January 26, 2020 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
Balance at April 26, 2020 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
Schedule of Finite-lived Intangible Assets Acquired | The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions, which are amortized over their estimated useful lives:
|  |  | April 26, 2020 |  | January 26, 2020
(in thousands) | Estimated Useful Life |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Core technologies | 3-8 years |  | $ | 43,300 |  |  | $ | (26,350 | ) |  | $ | 16,950 |  |  | $ | 82,857 |  |  | $ | (63,434 | ) |  | $ | 19,423 |
Customer relationships | 3 years |  | 4,000 |  |  | (3,778 | ) |  | 222 |  |  | 6,000 |  |  | (5,411 | ) |  | 589 |
Total finite-lived intangible assets |  |  | $ | 47,300 |  |  | $ | (30,128 | ) |  | $ | 17,172 |  |  | $ | 88,857 |  |  | $ | (68,845 | ) |  | $ | 20,012 |
Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows:
| Three Months Ended
(in thousands) | April 26, 2020 |  | April 28, 2019
Core technologies | $ | 2,473 |  |  | $ | 4,160 |
Customer relationships | 367 |  |  | 983 |
Total amortization expense | $ | 2,840 |  |  | $ | 5,143 |
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
Fiscal year 2021 (remaining nine months) | $ | 5,204 |  |  | $ | 222 |  |  | $ | 5,426 |
Fiscal year 2022 | 4,942 |  |  | — |  |  | 4,942 |
Fiscal year 2023 | 4,002 |  |  | — |  |  | 4,002 |
Fiscal year 2024 | 1,676 |  |  | — |  |  | 1,676 |
Fiscal year 2025 | 287 |  |  | — |  |  | 287 |
Thereafter | 839 |  |  | — |  |  | 839 |
Total expected amortization expense | $ | 16,950 |  |  | $ | 222 |  |  | $ | 17,172 |

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