Goodwill And Intangible Assets (Schedule Of Finite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 29, 2012 Y		Jan. 29, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 221,704		$ 81,030
Accumulated Amortization	(29,238)		(24,210)
Net Carrying Amount	192,466		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	171,837		65,900
Accumulated Amortization	(24,518)		(21,031)
Net Carrying Amount	147,319		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	(3,719)		(2,929)
Net Carrying Amount	36,411		9,201
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Life (in years)	5	[1]
Gross Carrying Amount	3,000	[1]	3,000	[1]
Accumulated Amortization	(400)	[1]	(250)	[1]
Net Carrying Amount	2,600	[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	6,737
Accumulated Amortization	(601)
Net Carrying Amount	$ 6,136

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