Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 26, 2020	Jan. 27, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 88,857	$ 201,961
Accumulated Amortization	(68,845)	(167,703)
Net Carrying Amount	20,012	34,258
Core technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	82,857	167,930
Accumulated Amortization	(63,434)	(136,544)
Net Carrying Amount	$ 19,423	31,386
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	$ 6,000	34,031
Accumulated Amortization	(5,411)	(31,159)
Net Carrying Amount	$ 589	$ 2,872
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	5 years