Intangible Assets (Tables)

12 Months Ended

Jan. 25, 2015

Notes to financial statements [Abstract]

Amortizable Intangible Assets Components

	January 25, 2015								January 26, 2014
	Gross Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted Average Useful Life	Gross Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted Average Useful Life
	(In thousands)							(In years)	(In thousands)							(In years)
Acquisition-related intangible assets	$	189,239	$	(134,062	)	$	55,177	6.8	$	189,239	$	(114,104	)	$	75,135	6.5
Patents and licensed technology	448,873		(282,336		)	166,537		7.2	446,196		(225,319		)	220,877		7.2
Total intangible assets	$	638,112	$	(416,398	)	$	221,714		$	635,435	$	(339,423	)	$	296,012