Goodwill and Intangible Assets - Schedule of Indefinite-lived Intangible Assets (Details) - In-process research and development - USD ($) $ in Thousands	12 Months Ended
	Jan. 26, 2020	Jan. 28, 2018
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite-lived intangible asset	$ 0	$ 2,300
Beginning balance, indefinite-lived intangible assets	2,300
Transfers to core technologies	(2,300)
Ending balance, indefinite-lived intangible assets	$ 0