Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 26, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 29,300	$ 88,857
Accumulated Amortization	(17,554)	(68,845)
Net Carrying Amount	11,746	20,012
Core technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	29,300	82,857
Accumulated Amortization	(17,554)	(63,434)
Net Carrying Amount	$ 11,746	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	$ 0	6,000
Accumulated Amortization	0	(5,411)
Net Carrying Amount	$ 0	$ 589