Goodwill and Acquisition-Related Intangibles (Tables)

6 Months Ended

Sep. 29, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

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

As of September 29, 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)	September 29, 2012			March 31, 2012			Amortization Life
Goodwill	$	158,990		$	149,538
In-process research and development	$	—		$	4,000
Core technology, gross	89,360			76,440			5.8 years
Less accumulated amortization	(49,834		)	(46,051		)
Core technology, net	39,526			30,389
Other intangibles, gross	46,516			46,206			2.7 years
Less accumulated amortization	(44,946		)	(44,263		)
Other intangibles, net	1,570			1,943
Total acquisition-related intangibles, gross	135,876			126,646
Less accumulated amortization	(94,780		)	(90,314		)
Total acquisition-related intangibles, net	$	41,096		$	36,332

Schedule of expected annual amortization expense for acquisition-related intangibles

Based on the carrying value of acquisition-related intangibles recorded as of September 29, 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 six months)	$	5,041
2014	9,542
2015	8,846
2016	8,244
2017	6,473
Thereafter	2,950
Total	$	41,096