Goodwill and Acquisition-Related Intangibles (Tables)

3 Months Ended

Jun. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Gross and net amounts of goodwill and of acquisition-related intangibles

As of June 30, 2012 and March 31, 2012, the gross and net amounts of goodwill and of acquisition-related intangibles for all acquisitions were as follows:

							Weighted Average
(In thousands)	June 30, 2012			March 31, 2012			Amortization Life
Goodwill	$	149,538		$	149,538
In-process research and development	$	—		$	4,000
Core technology, gross	80,440			76,440			5.7	years
Less accumulated amortization	(47,868		)	(46,051		)
Core technology, net	32,572			30,389
Other intangibles, gross	46,206			46,206			2.7	years
Less accumulated amortization	(44,594		)	(44,263		)
Other intangibles, net	1,612			1,943
Total acquisition-related intangibles, gross	126,646			126,646
Less accumulated amortization	(92,462		)	(90,314		)
Total acquisition-related intangibles, net	$	34,184		$	36,332

Schedule of expected annual amortization expense for acquisition-related intangibles

Based on the carrying value of acquisition-related intangibles recorded as of June 30, 2012, and assuming no subsequent impairment of the underlying assets, the annual amortization expense for acquisition-related intangibles is expected to be as follows:

Fiscal Year	(In thousands)
2013 (remaining nine months)	$	6,388
2014	7,918
2015	7,289
2016	6,742
2017	4,986
Thereafter	861
Total	$	34,184