Goodwill and Intangible Assets - Schedule of Finite-lived Intangible Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Jan. 31, 2016	Jan. 25, 2015	Jan. 26, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 184,940	$ 169,048	$ 185,997
Accumulated Amortization		(96,511)	(71,448)
Net Carrying Amount		88,429	97,600
Core technologies
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		148,210	134,155
Accumulated Amortization		(74,006)	(53,286)
Net Carrying Amount		$ 74,204	80,869
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		$ 30,030	28,030
Accumulated Amortization		(15,847)	(11,480)
Net Carrying Amount		$ 14,183	16,550
Customer relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		5 years
Customer relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		10 years
Technology licenses
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		2 years
Gross Carrying Amount	[1]	$ 100	263
Accumulated Amortization	[1]	(58)	(169)
Net Carrying Amount	[1]	42	94
Other intangible assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		6,600	6,600
Accumulated Amortization		(6,600)	(6,513)
Net Carrying Amount		$ 0	$ 87
Other intangible assets | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		1 year
Other intangible assets | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		5 years

[1] Technology licenses relate to licensing agreements entered into by the Company that are used in research and development activities and have alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” in the consolidated statements of operations.