Intangible Assets, Net (Tables)

12 Months Ended

Jan. 31, 2012

Finite-Lived Intangible Assets [Abstract]

Acquired Intangible Assets

Acquired intangible assets as of January 31, 2012 and 2011 are as follows:

		January 31,
	Useful Life	2012		2011
		(In thousands)
Gross carrying amount:
Intangible assets with finite lives:
Acquired technology	2 to 7 years	$	94,027	$	66,794
Customer relationships	4 to 10 years	225,554		198,106
Trade names	3 to 5 years	12,824		9,552
Non-competition agreements	3 to 10 years	5,779		5,215
Distribution network	10 years	2,440		2,440
Backlog	3 years	843		—
Total intangible assets with finite lives		341,467		282,107
In-process research and development with indefinite lives		2,500		—
		343,967		282,107
Accumulated amortization:
Acquired technology		49,732		37,579
Customer relationships		95,173		74,412
Trade names		9,805		9,177
Non-competition agreements		3,656		2,760
Distribution network		1,352		1,108
Backlog		19		—
		159,737		125,036
Total		$	184,230	$	157,071

Schedule of Expected Amortization Expense

Estimated future amortization expense on finite-lived acquisition-related intangible assets for each of the five succeeding fiscal years and thereafter is as follows:

Fiscal Years Ending January 31,	(In thousands)
2013	$	39,577
2014	34,412
2015	30,981
2016	29,643
2017	26,881
2018 and thereafter	20,236
	$	181,730