Goodwill And Intangible Assets (Schedule Of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Oct. 30, 2011 years		Jan. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 81,030		$ 78,030
Accumulated Amortization	(21,985)		(15,577)
Net Carrying Amount	59,045		62,453
Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life, minimum (in years)	2
Estimated Useful Life, maximum (in years)	10
Gross Carrying Amount	65,900		65,900
Accumulated Amortization	(19,296)		(14,006)
Net Carrying Amount	46,604		51,894
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life, minimum (in years)	8
Estimated Useful Life, maximum (in years)	10
Gross Carrying Amount	12,130		12,130
Accumulated Amortization	(2,589)		(1,571)
Net Carrying Amount	9,541		10,559
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	5	[1]
Gross Carrying Amount	3,000	[1]
Accumulated Amortization	(100)	[1]		[1]
Net Carrying Amount	$ 2,900	[1]

[1] Technology licenses relate to licensing agreements entered into by the Company.