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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Jan. 28, 2018
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 |  | Power and High-Reliability |  | Wireless and Sensing |  | Total
Balance at January 29, 2017 | $ | 261,891 |  |  | $ | 49,384 |  |  | $ | 18,428 |  |  | $ | 329,703 |
Additions | 12,194 |  |  | — |  |  | — |  |  | 12,194 |
Balance at January 28, 2018 | $ | 274,085 |  |  | $ | 49,384 |  |  | $ | 18,428 |  |  | $ | 341,897 |
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 continue to be amortized:
|  |  | January 28, 2018 |  | January 29, 2017
(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 |  | $ | 164,930 |  |  | $ | (115,628 | ) |  | $ | 49,302 |  |  | $ | 144,930 |  |  | $ | (92,940 | ) |  | $ | 51,990 |
Customer relationships | 3-10 years |  | 34,031 |  |  | (25,426 | ) |  | 8,605 |  |  | 30,030 |  |  | (20,247 | ) |  | 9,783 |
Total finite-lived intangible assets |  |  | $ | 198,961 |  |  | $ | (141,054 | ) |  | $ | 57,907 |  |  | $ | 174,960 |  |  | $ | (113,187 | ) |  | $ | 61,773 |
Schedule of amortization expenses recorded in the Statements of Income | Amortization expenses recorded in the Statements of Income for each period were as follows:
(in thousands) | January 28, 2018 |  | January 29, 2017 |  | January 31, 2016
Core technologies | $ | 22,688 |  |  | $ | 20,901 |  |  | $ | 20,692 |
Customer relationships | 5,179 |  |  | 4,400 |  |  | 4,367 |
Total amortization expense | $ | 27,867 |  |  | $ | 25,301 |  |  | $ | 25,059 |
Schedule of future amortization expense | Future amortization expense by operating segment is expected to be as follows:
(in thousands) |  |  |  |  |
To be recognized in: | Core Technologies |  | Customer relationships |  | Total
Fiscal year 2019 | $ | 20,666 |  |  | $ | 5,733 |  |  | $ | 26,399 |
Fiscal year 2020 | 13,239 |  |  | 2,283 |  |  | 15,522 |
Fiscal year 2021 | 6,389 |  |  | 589 |  |  | 6,978 |
Fiscal year 2022 | 3,905 |  |  | — |  |  | 3,905 |
Fiscal year 2023 | 3,714 |  |  | — |  |  | 3,714 |
Thereafter | 1,389 |  |  | — |  |  | 1,389 |
Total expected amortization expense | $ | 49,302 |  |  | $ | 8,605 |  |  | $ | 57,907 |
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 31, 2016 | $ | — |
Value at January 29, 2017 | — |
In-process research and development through acquisitions | 2,300 |
Value at January 28, 2018 | $ | 2,300 |

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