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Intangible Assets (Tables)
 12 Months Ended
Jan. 26, 2014
Notes to financial statements [Abstract]  
Amortizable Intangible Assets Components
 
January 26, 2014
 
January 27, 2013
 
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

 
$
(114,104
)
 
$
75,135

 
6.5
 
$
172,039

 
$
(96,389
)
 
$
75,650

 
6.9
Patents and licensed technology
446,196

 
(225,319
)
 
220,877

 
7.2
 
407,002

 
(170,320
)
 
236,682

 
7.0
Total intangible assets
$
635,435

 
$
(339,423
)
 
$
296,012

 
 
 
$
579,041

 
$
(266,709
)
 
$
312,332