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Intangible Assets
 9 Months Ended
Oct. 26, 2014
Notes to financial statements [Abstract]  
Intangible Assets
Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
October 26, 2014
 
January 26, 2014
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated Amortization
 
Net Carrying
Amount
 
(In thousands)
Acquisition-related intangible assets
$
189,239

 
$
(129,073
)
 
$
60,166

 
$
189,239

 
$
(114,104
)
 
$
75,135

Patents and licensed technology
449,204

 
(268,069
)
 
181,135

 
446,196

 
(225,319
)
 
220,877

Total intangible assets
$
638,443

 
$
(397,142
)
 
$
241,301

 
$
635,435

 
$
(339,423
)
 
$
296,012



Amortization expense associated with intangible assets for the three and nine months ended October 26, 2014 was $19.3 million and $57.7 million, respectively. Amortization expense associated with intangible assets for the three and nine months ended October 27, 2013 was $19.6 million and $55.6 million, respectively.  Future amortization expense related to the net carrying amount of intangible assets at October 26, 2014 is estimated to be $19.3 million for the remainder of fiscal year 2015, $71.9 million in fiscal year 2016, $63.8 million in fiscal year 2017, $49.1 million in fiscal year 2018, $20.5 million in fiscal year 2019 and a total of $16.7 million in fiscal year 2020 and beyond.