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Intangible Assets, Net
 9 Months Ended
Oct. 31, 2012
Finite-Lived Intangible Assets [Abstract]  
Intangible Assets, Net
INTANGIBLE ASSETS, NET
Intangible assets, net as of October 31, 2012 and January 31, 2012 were as follows:
 
 
Useful Life
 
October 31,
2012
 
January 31,
2012
 
 
 
(In thousands)
Gross carrying amount:
 
 
 
 
 
Intangible assets with finite lives:
 
 
 
 
 
Acquired technology
2 to 7 years
 
$
93,802

 
$
94,027

Customer relationships
4 to 10 years
 
225,941

 
225,554

Trade names
3 to 5 years
 
12,783

 
12,824

Non-competition agreements
3 to 10 years
 
5,776

 
5,779

Distribution network
10 years
 
2,440

 
2,440

Backlog
3 years
 
843

 
843

Total intangible assets with finite lives
 
 
341,585

 
341,467

In-process research and development with indefinite lives
 
 
2,500

 
2,500

 
 
 
344,085

 
343,967

Accumulated amortization:
 
 
 
 
 
Acquired technology
 
 
60,947

 
49,732

Customer relationships
 
 
112,614

 
95,173

Trade names
 
 
10,395

 
9,805

Non-competition agreements
 
 
4,279

 
3,656

Distribution network
 
 
1,535

 
1,352

Backlog
 
 
62

 
19

 
 
 
189,832

 
159,737

Total
 
 
$
154,253

 
$
184,230


Amortization of intangible assets was $9.8 million and $29.5 million for the three and nine months ended October 31, 2012, respectively, and $9.4 million and $25.7 million for the three and nine months ended October 31, 2011, respectively. There was no impairment of intangible assets for the nine months ended October 31, 2012 and 2011.
Intangible assets have been retrospectively adjusted as of January 31, 2012 to reflect measurement period adjustments to the purchase price allocations for several business combinations completed during the fiscal year ended January 31, 2012. These adjustments were identified during the three months ended April 30, 2012, and resulted from new information obtained about facts and circumstances that existed as of the respective acquisition dates. Intangible assets were changed to reduce acquired technology and customer relationships by $0.3 million and $0.4 million, respectively (see Note 5, Business Combinations).
Estimated future amortization expense on finite-lived acquisition-related intangible assets for the remainder of the fiscal year and the four succeeding fiscal years and thereafter is as follows:
 
Fiscal Years Ending January 31,
 
(In thousands)
2013 (remainder of fiscal year)
 
$
9,915

2014
 
34,510

2015
 
30,959

2016
 
29,568

2017
 
26,835

2018 and thereafter
 
19,966

 
 
$
151,753