Goodwill and Intangible Assets - Schedule of Indefinite-lived Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jan. 27, 2013	Jan. 29, 2012
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	$ 34,870	$ 12,370
Accumulated Impairment Loss	(3,170)	(2,470)
Net Carrying Amount	31,700	9,900
In-process research and development
Indefinite-lived Intangible Assets by Major Class [Line Items]
Gross Carrying Amount	34,870	12,370
Accumulated Impairment Loss	(3,170)	(2,470)
Net Carrying Amount	$ 31,700	$ 9,900