Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 27, 2019	Jan. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 201,961	$ 198,961
Accumulated Amortization	(167,703)	(141,054)
Net Carrying Amount	34,258	57,907
Core technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	167,930	164,930
Accumulated Amortization	(136,544)	(115,628)
Net Carrying Amount	$ 31,386	49,302
Core technologies | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 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	$ 34,031	34,031
Accumulated Amortization	(31,159)	(25,426)
Net Carrying Amount	$ 2,872	$ 8,605
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	10 years