Goodwill and Intangible Assets - Schedule Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands		3 Months Ended
		May. 01, 2016	Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 184,940	$ 184,940
Accumulated amortization		(102,926)	(96,510)
Net carrying amount		82,014	88,430
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		148,210	148,210
Accumulated amortization		(79,308)	(74,006)
Net carrying amount		$ 68,902	74,204
Core Technologies [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		5 years
Core Technologies [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		8 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 30,030	30,030
Accumulated amortization		(16,947)	(15,847)
Net carrying amount		$ 13,083	14,183
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		5 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		10 years
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		2 years
Gross carrying amount	[1]	$ 100	100
Accumulated amortization	[1]	(71)	(57)
Net carrying amount	[1]	29	43
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		6,600	6,600
Accumulated amortization		(6,600)	(6,600)
Net carrying amount		$ 0	$ 0
Other Intangible Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		1 year
Other Intangible Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		5 years

[1] Technology licenses relate to end-license agreements for intellectual property that is used by the Company in research and development activities and also has alternative future uses. Amortization expense related to technology licenses is reported as “Product development and engineering” in the condensed consolidated statements of operations.