Marketable Securities (Tables)

9 Months Ended

Jan. 01, 2012

Marketable Securities [Abstract]

Schedule of Available-For-Sale Securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
January 1, 2012
U.S. government and agency securities	$	121,512	$	233	$	(27	)	$	121,718
Corporate debt obligations		144,650		750		(531	)		144,869
Asset and mortgage-backed securities		38,895		218		(73	)		39,040
Municipal bonds		15,788		22		(2	)		15,808
Total debt securities		320,845		1,223		(633	)		321,435
Certificates of deposit		192		—		—			192
	$	321,037	$	1,223	$	(633	)	$	321,627
April 3, 2011
U.S. government and agency securities	$	55,875	$	94	$	(216	)	$	55,753
Corporate debt obligations		137,706		1,012		(282	)		138,436
Asset and mortgage-backed securities		22,249		293		(52	)		22,490
Municipal bonds		17,941		10		(10	)		17,941
Non-U.S. government and agency securities		1,676		—		—			1,676
	$	235,447	$	1,409	$	(560	)	$	236,296

Schedule of Amortized Cost and Estimated Fair Value of Debt Securities

	Amortized Cost		Estimated Fair Value
	(In thousands)
Due in one year or less	$	108,574	$	108,884
Due after one year through three years		147,688		147,830
Due after three years through five years		20,977		20,972
Due after five years		43,606		43,749
	$	320,845	$	321,435

Schedule of Unrealized Losses by Investment Company

	Less Than 12 Months					12 Months or Greater					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(In thousands)
January 1, 2012
U.S. government and agency securities	$	48,183	$	(27	)	$	—	$	—		$	48,183	$	(27	)
Corporate debt obligations		65,975		(529	)		327		(2	)		66,302		(531	)
Asset and mortgage-backed securities		14,935		(73	)		—		—			14,935		(73	)
Municipal bonds		2,073		(2	)		—		—			2,073		(2	)
	$	131,166	$	(631	)	$	327	$	(2	)	$	131,493	$	(633	)
April 3, 2011
U.S. government and agency securities	$	25,712	$	(216	)	$	—	$	—		$	25,712	$	(216	)
Corporate debt obligations		60,595		(282	)		—		—			60,595		(282	)
Asset and mortgage-backed securities		7,991		(52	)		—		—			7,991		(52	)
Municipal bonds		1,866		(10	)		—		—			1,866		(10	)
	$	96,164	$	(560	)	$	—	$	—		$	96,164	$	(560	)