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

 
$
(124,083
)
 
$
65,156

 
$
189,239

 
$
(114,104
)
 
$
75,135

Patents and licensed technology
449,204

 
(253,747
)
 
195,457

 
446,196

 
(225,319
)
 
220,877

Total intangible assets
$
638,443

 
$
(377,830
)
 
$
260,613

 
$
635,435

 
$
(339,423
)
 
$
296,012



Amortization expense associated with intangible assets for the three and six months ended July 27, 2014 was $19.3 million and $38.4 million, respectively. Amortization expense associated with intangible assets for the three and six months ended July 28, 2013 was $18.6 million and $36.0 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 July 27, 2014 is estimated to be $40.0 million for the remainder of fiscal year 2015, $71.9 million in fiscal year 2016, $63.7 million in fiscal year 2017, $49.0 million in fiscal year 2018, $20.4 million in fiscal year 2019 and a total of $15.6 million in fiscal year 2020 and beyond.