Marketable Securities (Tables)

6 Months Ended

Oct. 02, 2011

Marketable Securities [Abstract]

Schedule of Available-For-Sale Securities

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
October 2, 2011
U.S. government and agency securities	$	84,825	$	188	$	(32	)	$	84,981
Corporate debt obligations		178,358		868		(872	)		178,354
Asset and mortgage-backed securities		29,769		200		(80	)		29,889
Municipal bonds		21,153		34		(5	)		21,182
Non-U.S. government and agency securities		1,652		—		—			1,652
Total debt securities		315,757		1,290		(989	)		316,058
Certificates of deposit		209		—		—			209
	$	315,966	$	1,290	$	(989	)	$	316,267
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	$	101,865	$	102,121
Due after one year through three years		147,834		147,833
Due after three years through five years		26,136		26,065
Due after five years		39,922		40,039
	$	315,757	$	316,058

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)
October 2, 2011
U.S. government and agency securities	$	27,057	$	(32	)	$	—	$	—		$	27,057	$	(32	)
Corporate debt obligations		96,436		(872	)		—		—			96,436		(872	)
Asset and mortgage-backed securities		12,758		(76	)		186		(4	)		12,944		(80	)
Municipal bonds		2,858		(5	)		—		—			2,858		(5	)
	$	139,109	$	(985	)	$	186	$	(4	)	$	139,295	$	(989	)
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	)