Goodwill And Intangible Assets (Schedule Of Indefinite-Lived Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 29, 2012	Jan. 29, 2012
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 47,470	$ 12,370
Accumulated Impairment Loss	(3,170)	(2,470)
Net Carrying Amount	44,300	9,900
In-Process Research And Development [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	47,470	12,370
Accumulated Impairment Loss	(3,170)	(2,470)
Net Carrying Amount	$ 44,300	$ 9,900