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Intangible Assets, Net
3 Months Ended
Apr. 30, 2011
Intangible Assets, Net  
Intangible Assets, Net

7. INTANGIBLE ASSETS, NET

Acquired intangible assets as of April 30, 2011 and January 31, 2011 are as follows:

 

     Useful Life      April 30,
2011
     January 31,
2011
 
            (In thousands)  

Gross carrying amount:

     

Acquired technology

     2 to 7 years       $ 168,071       $ 164,796   

Customer relationships

     4 to 10 years         237,488         233,995   

Trade names

     1 to 10 years         13,046         12,952   

Non-competition agreements

     4 to 10 years         5,818         5,215   

Sales backlog

     3 years         691         —     

Distribution network

     10 years         2,440         2,440   
                    
        427,554         419,398   

Accumulated amortization:

        

Acquired technology

        117,363         110,740   

Customer relationships

        102,518         95,753   

Trade names

        12,968         12,577   

Non-competition agreements

        3,016         2,760   

Distribution network

        1,169         1,108   
                    
        237,034         222,938   
                    

Total

      $ 190,520       $ 196,460   
                    

 

Amortization of intangible assets was $12.7 million and $12.2 million for the three months ended April 30, 2011 and 2010, respectively. There was no impairment of finite-lived intangible assets for the three months ended April 30, 2011 and 2010.