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Intangible Assets
 3 Months Ended
Apr. 27, 2014
Notes to financial statements [Abstract]  
Intangible Assets
Intangible Assets
 
The components of our amortizable intangible assets are as follows:
 
April 27, 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

 
$
(119,094
)
 
$
70,145

 
$
189,239

 
$
(114,104
)
 
$
75,135

Patents and licensed technology
446,853

 
(239,468
)
 
207,385

 
446,196

 
(225,319
)
 
220,877

Total intangible assets
$
636,092

 
$
(358,562
)
 
$
277,530

 
$
635,435

 
$
(339,423
)
 
$
296,012



Amortization expense associated with intangible assets for the three months ended April 27, 2014 and April 28, 2013 was $19.1 million and $17.4 million, respectively. Amortization expense increased compared to the prior year primarily due to the addition of licensed technology, the purchase of certain assets of a business, and the addition of acquired in-process research and development technology that was determined to be complete. Future amortization expense related to the net carrying amount of intangible assets at April 27, 2014 is estimated to be $57.6 million for the remainder of fiscal year 2015, $71.4 million in fiscal year 2016, $63.4 million in fiscal year 2017, $48.5 million in fiscal year 2018, $20.0 million in fiscal year 2019 and a total of $16.6 million in fiscal year 2020 and fiscal years subsequent to fiscal year 2020.