Intangible Assets (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 28, 2012	Oct. 30, 2011	Oct. 28, 2012	Oct. 30, 2011	Jan. 29, 2012
Amortizable intangible assets components
Gross Carrying Amount	$ 580,591,000		$ 580,591,000		$ 524,425,000
Accumulated Amortization	(249,343,000)		(249,343,000)		(198,289,000)
Net Carrying Amount	331,248,000		331,248,000		326,136,000
Amortization expense associated with intangible assets
Amortization expense	17,300,000	16,400,000	51,100,000	42,900,000
Future amortization expense associated with intangible assets
Remainder of fiscal 2013			17,000,000
Fiscal 2014			66,300,000
Fiscal 2015			66,200,000
Fiscal 2016			60,800,000
Fiscal 2017			50,600,000
Fiscal 2018 and fiscal years subsequent of fiscal 2018			70,300,000
Acquisition-related intangible assets
Amortizable intangible assets components
Gross Carrying Amount	172,039,000		172,039,000		172,039,000
Accumulated Amortization	(92,063,000)		(92,063,000)		(79,261,000)
Net Carrying Amount	79,976,000		79,976,000		92,778,000
Patents and Licensed Technology [Member]
Amortizable intangible assets components
Gross Carrying Amount	408,552,000		408,552,000		352,386,000
Accumulated Amortization	(157,280,000)		(157,280,000)		(119,028,000)
Net Carrying Amount	$ 251,272,000		$ 251,272,000		$ 233,358,000