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Goodwill and Intangible Assets | 3 Months Ended
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Apr. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The 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 |
Goodwill is not amortized, but is tested for impairment at the reporting unit level using either a qualitative or quantitative assessment on an annual basis during the fourth quarter of each fiscal year, and whenever events or changes in circumstances indicate that the carrying value may not be recoverable. The recoverability of goodwill is measured at the reporting unit level by comparing the reporting unit’s carrying amount, including goodwill, to the fair market value of the reporting unit. As of April 26, 2020, there was no indication of impairment of the Company's goodwill balances. Purchased Intangibles 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 |
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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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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