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Goodwill and Intangible Assets - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 27, 2019 | Oct. 28, 2018 | Oct. 27, 2019 | Oct. 28, 2018 | Jan. 27, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
2020 (remaining three months) | $ 3,700 |  | $ 3,700 |  |
2021 | 7,978 |  | 7,978 |  |
2022 | 4,655 |  | 4,655 |  |
2023 | 3,714 |  | 3,714 |  |
2024 | 1,389 |  | 1,389 |  |
Thereafter | 0 |  | 0 |  |
Total expected amortization expense | 21,436 |  | 21,436 |  | $ 34,258
Intangible amortization | 3,770 | $ 6,480 | 12,821 | $ 19,921 |
Core technologies |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
2020 (remaining three months) | 3,267 |  | 3,267 |  |
2021 | 7,389 |  | 7,389 |  |
2022 | 4,655 |  | 4,655 |  |
2023 | 3,714 |  | 3,714 |  |
2024 | 1,389 |  | 1,389 |  |
Thereafter | 0 |  | 0 |  |
Total expected amortization expense | 20,414 |  | 20,414 |  | 31,386
Intangible amortization | 3,337 | 5,047 | 10,971 | 15,622 |
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
2020 (remaining three months) | 433 |  | 433 |  |
2021 | 589 |  | 589 |  |
2022 | 0 |  | 0 |  |
2023 | 0 |  | 0 |  |
2024 | 0 |  | 0 |  |
Thereafter | 0 |  | 0 |  |
Total expected amortization expense | 1,022 |  | 1,022 |  | $ 2,872
Intangible amortization | $ 433 | $ 1,433 | $ 1,850 | $ 4,299 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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