Intangible Assets, Net

9 Months Ended

Oct. 31, 2011

Intangible Assets, Net [Abstract]

Intangible Assets, Net

7. INTANGIBLE ASSETS, NET

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

	Useful Life	October 31, 2011		January 31, 2011
		(In thousands)
Gross carrying amount:
Acquired technology	2 to 7 years	$	190,272	$	164,796
Customer relationships	4 to 10 years		263,001		233,995
Trade names	1to 10 years		15,983		12,952
Non-competition agreements	4to 10 years		5,797		5,215
Sales backlog	3years		843		—
Distribution network	10years		2,440		2,440
			478,336		419,398
Accumulated amortization:
Acquired technology			130,130		110,740
Customer relationships			114,029		95,753
Trade names			13,102		12,577
Non-competition agreements			3,462		2,760
Sales backlog			5		—
Distribution network			1,291		1,108
			262,019		222,938
Total		$	216,317	$	196,460

Amortization of intangible assets was $13.6 million and $38.9 million for the three and nine months ended October 31, 2011, respectively, and $12.3 million and $36.7 million for the three and nine months ended October 31, 2010, respectively. There was no impairment of intangible assets for the three and nine months ended October 31, 2011 and 2010.