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Goodwill and Intangible Assets | 6 Months Ended
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Jul. 28, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets 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 July 28, 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 | — |  |  | — |  |  | 4,834 |  |  | 4,834 |
Balance at July 29, 2018 | $ | 274,085 |  |  | $ | 67,812 |  |  | $ | 4,834 |  |  | $ | 346,731 |
The reporting units are the same as the operating segments, which are part of a single reportable segment (see Note 13). Goodwill is tested for impairment at the reporting unit level during the fourth quarter of each fiscal year. In addition to its annual review, the Company performs a test of impairment when indicators of impairment are present. As of July 28, 2019, 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 continue to be amortized:
|  |  | July 28, 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 |  | $ | 88,088 |  |  | $ | (64,337 | ) |  | $ | 23,751 |  |  | $ | 167,930 |  |  | $ | (136,544 | ) |  | $ | 31,386 |
Customer relationships | 3-10 years |  | 6,001 |  |  | (4,546 | ) |  | 1,455 |  |  | 34,031 |  |  | (31,159 | ) |  | 2,872 |
Total finite-lived intangible assets |  |  | $ | 94,089 |  |  | $ | (68,883 | ) |  | $ | 25,206 |  |  | $ | 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 |  | Six Months Ended
(in thousands) | July 28, 2019 |  | July 29, 2018 |  | July 28, 2019 |  | July 29, 2018
Core technologies | $ | 3,475 |  |  | $ | 5,047 |  |  | $ | 7,634 |  |  | $ | 10,575 |
Customer relationships | 433 |  |  | 1,433 |  |  | 1,417 |  |  | 2,866 |
Total amortization expense | $ | 3,908 |  |  | $ | 6,480 |  |  | $ | 9,051 |  |  | $ | 13,441 |
Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands) |  |  |  |  |
Fiscal Year Ending: | Core Technologies |  | Customer Relationships |  | Total
2020 (remaining six months) | $ | 6,604 |  |  | $ | 866 |  |  | $ | 7,470 |
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 | $ | 23,751 |  |  | $ | 1,455 |  |  | $ | 25,206 |
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 July 28, 2019 | $ | 2,300 |
Indefinite-lived intangible assets are tested for impairment annually on the first day of the fourth quarter or more frequently if events or changes in circumstances (each, a “triggering event”) would more likely than not reduce the carrying value of the asset below its fair value, calculated as the future discounted cash flows that asset is expected to generate. Management did not identify any triggering events during the six months ended July 28, 2019, that would require an interim impairment analysis.

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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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