Goodwill and Acquisition-Related Intangibles (Tables)

12 Months Ended

Mar. 31, 2012

Goodwill and Acquisition-Related Intangibles [Abstract]

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

							Weighted Average
(In thousands)	2012			2011			Amortization Life
Goodwill	$	149,538		$	133,580
In-process research and development	$	4,000		$	6,000
Core technology—gross		76,440			58,439			5.7 years
Less accumulated amortization		(46,051	)		(39,789	)
Core technology—net		30,389			18,650
Other intangibles—gross		46,206			45,201			2.7 years
Less accumulated amortization		(44,263	)		(42,955	)
Other intangibles—net		1,943			2,246
Total acquisition-related intangibles-gross		126,646			109,640
Less accumulated amortization		(90,314	)		(82,744	)
Total acquisition-related intangibles-net	$	36,332		$	26,896

Schedule of expected annual amortization expense for acquisition-related intangibles

Fiscal Year	(In thousands)
2013	$	8,536
2014		7,918
2015		7,289
2016		6,742
2017		4,986
Thereafter		861
Total	$	36,332