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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 26, 2020 | Jan. 26, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 47,300 | $ 88,857
Accumulated Amortization | (30,128) | (68,845)
Total expected amortization expense | 17,172 | 20,012
Core technologies |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 43,300 | 82,857
Accumulated Amortization | (26,350) | (63,434)
Total expected amortization expense | $ 16,950 | 19,423
Core technologies | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 3 years |
Core technologies | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 8 years |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,000 | 6,000
Accumulated Amortization | (3,778) | (5,411)
Total expected amortization expense | $ 222 | $ 589
Customer relationships | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 3 years |
Customer relationships | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 3 years |

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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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