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Goodwill and Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jul. 28, 2019 | Jan. 27, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 94,089 | $ 201,961
Accumulated amortization | (68,883) | (167,703)
Total expected amortization expense | 25,206 | 34,258
Core Technologies [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | 88,088 | 167,930
Accumulated amortization | (64,337) | (136,544)
Total expected amortization expense | $ 23,751 | 31,386
Core Technologies [Member] | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 5 years |
Core Technologies [Member] | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 8 years |
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross carrying amount | $ 6,001 | 34,031
Accumulated amortization | (4,546) | (31,159)
Total expected amortization expense | $ 1,455 | $ 2,872
Customer Relationships [Member] | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 3 years |
Customer Relationships [Member] | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life | 10 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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