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Intangible Assets
 3 Months Ended
Apr. 28, 2013
Notes to financial statements [Abstract]  
Intangible Assets
Intangible Assets
 
The components of our amortizable intangible assets are as follows:

 
April 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
$
172,039

 
$
(100,306
)
 
$
71,733

 
$
172,039

 
$
(96,389
)
 
$
75,650

Patents and licensed technology
448,834

 
(183,834
)
 
265,000

 
407,002

 
(170,320
)
 
236,682

Total intangible assets
$
620,873

 
$
(284,140
)
 
$
336,733

 
$
579,041

 
$
(266,709
)
 
$
312,332



The increase in gross carrying amount of intangible assets is primarily due to new purchases of licenses to technology and patents during the first quarter of fiscal year 2014.

Amortization expense associated with intangible assets for the three months ended April 28, 2013 and April 29, 2012 was $17.4 million and $16.6 million, respectively. Amortization expense increased compared to the prior year primarily due to the addition of a licensed technology and a patent portfolio. Future amortization expense related to the net carrying amount of intangible assets at April 28, 2013 is estimated to be $56.6 million for the remainder of fiscal year 2014, $75.3 million in fiscal year 2015, $68.2 million in fiscal year 2016, $51.7 million in fiscal year 2017, $48.7 million in fiscal year 2018 and a total of $36.2 million in fiscal year 2019 and fiscal years subsequent to fiscal year 2019.