Investment Securities (Tables)

12 Months Ended

Mar. 31, 2013

Schedule of Available-For-Sale Securities

The Company’s portfolio of available-for-sale marketable securities consists of the following:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
	(In thousands)
March 31, 2013
U.S. government and agency securities	$	113,033	$	327	$	(1	)	$	113,359
Corporate debt obligations		153,460		1,429		(30	)		154,859
Mortgage-backed securities		50,852		473		(44	)		51,281
Municipal bonds		39,661		211		—			39,872
Other debt securities		602		1		—			603
	$	357,608	$	2,441	$	(75	)	$	359,974
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

The amortized cost and estimated fair value of debt securities as of March 31, 2013, by contractual maturity, are presented below. Expected maturities will differ from contractual maturities because the issuers of securities may have the right to repay obligations without prepayment penalties. Certain debt instruments, although possessing a contractual maturity greater than one year, are classified as short-term marketable securities based on their ability to be traded on active markets and availability for current operations.

	Amortized Cost		Estimated Fair Value
	(In thousands)
Due in one year or less	$	62,900	$	63,031
Due after one year through three years		186,188		187,252
Due after three years through five years		63,464		63,781
Due after five years		45,056		45,910
	$	357,608	$	359,974

Schedule of Unrealized Losses by Investment Category

The following table presents the Company’s marketable securities with unrealized losses by investment category and length of time that individual securities have been in a continuous unrealized loss position as of March 31, 2013 and April 1, 2012.

	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)
March 31, 2013
U.S. government and agency securities	$	4,502	$	(1	)	$	—	$	—		$	4,502	$	(1	)
Corporate debt obligations		24,203		(30	)		—		—			24,203		(30	)
Mortgage-backed securities		10,048		(44	)		—		—			10,048		(44	)
	$	38,753	$	(75	)	$	—	$	—		$	38,753	$	(75	)
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	)