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Intangible Assets (Tables)
 6 Months Ended
Jul. 28, 2013
Notes to financial statements [Abstract]  
Amortizable Intangible Assets Components
 
July 28, 2013
 
January 27, 2013
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net Carrying
Amount
 
(In thousands)
Acquisition-related intangible assets
$
173,039

 
$
(104,288
)
 
$
68,751

 
$
172,039

 
$
(96,389
)
 
$
75,650

Patents and licensed technology
452,161

 
(198,392
)
 
253,769

 
407,002

 
(170,320
)
 
236,682

Total intangible assets
$
625,200

 
$
(302,680
)
 
$
322,520

 
$
579,041

 
$
(266,709
)
 
$
312,332