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Goodwill and Intangible Assets | 12 Months Ended
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Jan. 27, 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 28, 2018 | $ | 274,085 |  |  | $ | 67,812 |  |  | $ | — |  |  | $ | 341,897 |
Additions (1) | — |  |  | 4,316 |  |  | 4,928 |  |  | 9,244 |
Balance at January 27, 2019 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
(1) See Note 3 for Goodwill associated with acquisitions in the current fiscal year. Goodwill is not amortized, but is tested for impairment using either a qualitative assessment or a two-step method on an annual basis, 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 a result of the realignment of its operating segments, during the first quarter of fiscal year 2019, the Company combined the Wireless and Sensing and the Power and High-Reliability reporting units (see Note 14). Goodwill of $49.4 million that was related to the Power and High-Reliability reporting unit, which was previously a separate reporting unit, is now included in the Wireless and Sensing reporting unit’s goodwill balance. The reporting units are the same as the operating segments which are part of a single reportable segment. The difference between the fair value and the carrying amount of these reporting units is one of several factors the Company considers when assessing whether to perform the first step of the goodwill impairment test. Goodwill is tested for impairment at the reporting unit level during the fourth quarter of each fiscal year. For fiscal years 2019 and 2018, the Company performed a qualitative assessment and concluded that it was more likely than not that the fair value of each of the three reporting units exceeded its carrying value. As such, the Company did not perform a quantitative impairment analysis. In addition to its annual review, the Company performs a test of impairment when indicators of impairment are present. As of January 27, 2019, and January 28, 2018, there were no indications 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 and technology licenses purchased, which continue to be amortized:
|  |  | January 27, 2019 |  | January 28, 2018
(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 |  | $ | 167,930 |  |  | $ | (136,544 | ) |  | $ | 31,386 |  |  | $ | 164,930 |  |  | $ | (115,628 | ) |  | $ | 49,302 |
Customer relationships | 3-10 years |  | 34,031 |  |  | (31,159 | ) |  | 2,872 |  |  | 34,031 |  |  | (25,426 | ) |  | 8,605 |
Total finite-lived intangible assets |  |  | $ | 201,961 |  |  | $ | (167,703 | ) |  | $ | 34,258 |  |  | $ | 198,961 |  |  | $ | (141,054 | ) |  | $ | 57,907 |
Amortization expenses recorded in the Statements of Income for each period were as follows:
(in thousands) | January 27, 2019 |  | January 28, 2018 |  | January 29, 2017
Core technologies | $ | 20,916 |  |  | $ | 22,688 |  |  | $ | 20,901 |
Customer relationships | 5,733 |  |  | 5,179 |  |  | 4,400 |
Total amortization expense | $ | 26,649 |  |  | $ | 27,867 |  |  | $ | 25,301 |
Future amortization expense is expected to be as follows:
(in thousands) |  |  |  |  |
To be recognized in: | Core Technologies |  | Customer relationships |  | Total
Fiscal year 2020 | $ | 14,239 |  |  | $ | 2,283 |  |  | $ | 16,522 |
Fiscal year 2021 | 7,389 |  |  | 589 |  |  | 7,978 |
Fiscal year 2022 | 4,655 |  |  | — |  |  | 4,655 |
Fiscal year 2023 | 3,714 |  |  | — |  |  | 3,714 |
Fiscal year 2024 | 1,389 |  |  | — |  |  | 1,389 |
Thereafter | — |  |  | — |  |  | — |
Total expected amortization expense | $ | 31,386 |  |  | $ | 2,872 |  |  | $ | 34,258 |
The following table sets forth the Company’s indefinite-lived intangible assets resulting from additions to IPR&D:
(in thousands) | Net Carrying Amount
Value at January 29, 2017 | $ | — |
In-process research and development through acquisitions | 2,300 |
Value at January 28, 2018 | 2,300 |
Value at January 27, 2019 | $ | 2,300 |
The Company reviews indefinite-lived intangible assets for impairment during the fourth quarter of each year by comparing the carrying amount of the asset to the future discounted cash flows that asset is expected to generate.

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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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