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Intangible Assets
 6 Months Ended
Jul. 31, 2011
Notes to financial statements [Abstract]  
Intangible Assets
Note 11 - Intangible Assets
 
 The components of our amortizable intangible assets are as follows:

 
July 31, 2011
 
January 30, 2011
 
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
 
(In thousands)
 
Technology licenses
 
$
319,445
   
$
(79,338
)
 
$
240,107
   
$
320,477
   
$
(62,791
)
 
$
257,686
 
Acquisition-related intangible assets
   
172,039
     
(68,496
)
   
103,543
     
75,339
     
(61,114
)
   
14,225
 
Patents
   
32,403
     
(17,917
)
   
14,486
     
32,203
     
(15,369
)
   
16,834
 
Total intangible assets
 
$
523,887
   
$
(165,751
)
 
$
358,136
   
$
428,019
   
$
(139,274
)
 
$
288,745
 

        Amortization expense associated with intangible assets for the three and six months ended July 31, 2011 was $15.6 million and $26.5 million, respectively. Amortization expense associated with intangible assets for the three and six months ended August 1, 2010 was $7.2 million and $14.3 million, respectively. Amortization expense increased compared to prior year primarily due to addition of acquisition-related intangible assets from the Icera acquisition completed on June 10, 2011.  Please refer to Note 9 of these Notes to Condensed Consolidated Financial Statements for further information regarding this business combination.  Future amortization expense related to the net carrying amount of intangible assets at July 31, 2011 is estimated to be $32.4 million for the remainder of fiscal year 2012, $57.4 million in fiscal year 2013, $52.8 million in fiscal year 2014, $52.7 million in fiscal year 2015, $47.4 million in fiscal year 2016 and a total of $115.5 million in fiscal year 2017 and fiscal years subsequent to fiscal year 2017.