Marketable Securities (Tables)

3 Months Ended

Jul. 01, 2012

Marketable Securities [Abstract]

Schedule of Available-For-Sale Securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
July 1, 2012
U.S. government and agency securities	$	130,273	$	286	$	(28	)	$	130,531
Corporate debt obligations		170,682		1,014		(116	)		171,580
Asset and mortgage-backed securities		48,817		352		(72	)		49,097
Municipal bonds		28,053		50		(21	)		28,082
	$	377,825	$	1,702	$	(237	)	$	379,290
April 1, 2012
U.S. government and agency securities	$	141,680	$	257	$	(78	)	$	141,859
Corporate debt obligations		166,763		1,071		(166	)		167,668
Asset and mortgage-backed securities		46,395		272		(73	)		46,594
Municipal bonds		16,548		22		(2	)		16,568
Other debt securities		750		—		—			750
	$	372,136	$	1,622	$	(319	)	$	373,439

Schedule of Amortized Cost and Estimated Fair Value of Debt Securities

	Amortized Cost		Estimated Fair Value
	(In thousands)
Due in one year or less	$	86,736	$	86,765
Due after one year through three years		208,834		209,525
Due after three years through five years		32,593		32,745
Due after five years		49,662		50,255
	$	377,825	$	379,290

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)
July 1, 2012
U.S. government and agency securities	$	39,355	$	(28	)	$	—	$	—		$	39,355	$	(28	)
Corporate debt obligations		57,548		(113	)		1,664		(3	)		59,212		(116	)
Asset and mortgage-backed securities		17,183		(64	)		321		(8	)		17,504		(72	)
Municipal bonds		9,737		(21	)		—		—			9,737		(21	)
	$	123,823	$	(226	)	$	1,985	$	(11	)	$	125,808	$	(237	)
April 1, 2012
U.S. government and agency securities	$	76,239	$	(78	)	$	—	$	—		$	76,239	$	(78	)
Corporate debt obligations		66,997		(166	)		—		—			66,997		(166	)
Asset and mortgage-backed securities		12,996		(69	)		139		(4	)		13,135		(73	)
Municipal bonds		1,978		(2	)		—		—			1,978		(2	)
	$	158,210	$	(315	)	$	139	$	(4	)	$	158,349	$	(319	)