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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Jan. 26, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill balances | 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 January 26, 2020 | $ | 274,085 |  |  | $ | 72,128 |  |  | $ | 4,928 |  |  | $ | 351,141 |
Schedule of finite-lived intangible assets which continue to be amortized | The following table sets forth the Company’s finite-lived intangible assets resulting from business acquisitions and technology licenses purchased, which are amortized over their estimated useful lives:
|  |  | January 26, 2020 |  | 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 | 3-8 years |  | $ | 82,857 |  |  | $ | (63,434 | ) |  | $ | 19,423 |  |  | $ | 167,930 |  |  | $ | (136,544 | ) |  | $ | 31,386 |
Customer relationships | 3-5 years |  | 6,000 |  |  | (5,411 | ) |  | 589 |  |  | 34,031 |  |  | (31,159 | ) |  | 2,872 |
Total finite-lived intangible assets |  |  | $ | 88,857 |  |  | $ | (68,845 | ) |  | $ | 20,012 |  |  | $ | 201,961 |  |  | $ | (167,703 | ) |  | $ | 34,258 |
Schedule of amortization expenses recorded in the Statements of Income | Amortization expense of finite-lived intangible assets recorded in the Statements of Income for each period was as follows:
(in thousands) | January 26, 2020 |  | January 27, 2019 |  | January 28, 2018
Core technologies | $ | 14,263 |  |  | $ | 20,916 |  |  | $ | 22,688 |
Customer relationships | 2,283 |  |  | 5,733 |  |  | 5,179 |
Total amortization expense | $ | 16,546 |  |  | $ | 26,649 |  |  | $ | 27,867 |
Schedule of future amortization expense | Future amortization expense of finite-lived intangible assets is expected as follows:
(in thousands) |  |  |  |  |
To be recognized in: | Core Technologies |  | Customer relationships |  | Total
Fiscal year 2021 | $ | 7,677 |  |  | $ | 589 |  |  | $ | 8,266 |
Fiscal year 2022 | 4,942 |  |  | — |  |  | 4,942 |
Fiscal year 2023 | 4,002 |  |  | — |  |  | 4,002 |
Fiscal year 2024 | 1,676 |  |  | — |  |  | 1,676 |
Fiscal year 2025 | 1,126 |  |  | — |  |  | 1,126 |
Total expected amortization expense | $ | 19,423 |  |  | $ | 589 |  |  | $ | 20,012 |
Schedule of indefinite-lived intangible assets | 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 28, 2018 | $ | 2,300 |
Value at January 27, 2019 | 2,300 |
Transfers to core technologies | (2,300 | )
Value at January 26, 2020 | $ | — |

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