Goodwill and Intangible Assets (Schedule Of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jul. 29, 2012 Y		Jan. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 216,978		$ 81,030
Accumulated Amortization	(37,364)		(24,210)
Net Carrying Amount	179,614		56,820
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	167,124		65,900
Accumulated Amortization	(29,822)		(21,031)
Net Carrying Amount	137,302		44,869
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life, minimum (in years)	7
Estimated Useful Life, maximum (in years)	10
Gross Carrying Amount	40,130		12,130
Accumulated Amortization	(5,058)		(2,929)
Net Carrying Amount	35,072		9,201
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	5
Gross Carrying Amount	3,000	[1]	3,000	[1]
Accumulated Amortization	(550)	[1]	(250)	[1]
Net Carrying Amount	2,450	[1]	2,750	[1]
Other Intangibles Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life, minimum (in years)	1
Estimated Useful Life, maximum (in years)	5
Gross Carrying Amount	6,724		0
Accumulated Amortization	(1,934)		0
Net Carrying Amount	$ 4,790		$ 0

[1] Technology licenses relate to licensing agreements entered into by the Company. Amortization expense related to technology licenses is reported as “Product development and engineering” in the Unaudited Consolidated Condensed Statements of Income.