Fair Value Measurements (Tables)

12 Months Ended

Mar. 31, 2013

Schedule of Assets Measured at Fair Value on a Recurring Basis

Assets measured at fair value on a recurring basis as of March 31, 2013 and April 1, 2012 are as follows:

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
	(In thousands)
March 31, 2013
Cash and cash equivalents	$	95,098	$	434	$	—	$	95,532
Marketable securities:
U.S. government and agency securities		113,359		—		—		113,359
Corporate debt obligations		—		154,859		—		154,859
Mortgage-backed securities		—		51,281		—		51,281
Municipal bonds		—		39,872		—		39,872
Other debt securities		—		603		—		603
		113,359		246,615		—		359,974
	$	208,457	$	247,049	$	—	$	455,506

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
	(In thousands)
April 1, 2012
Cash and cash equivalents	$	162,266	$	2,250	$	—	$	164,516
Marketable securities:
U.S. government and agency securities		141,859		—		—		141,859
Corporate debt obligations		—		167,668		—		167,668
Asset and mortgage-backed securities		—		46,594		—		46,594
Municipal bonds		—		16,568		—		16,568
Other debt securities		—		750		—		750
		141,859		231,580		—		373,439
	$	304,125	$	233,830	$	—	$	537,955