Fair Value Measurements (Tables)

6 Months Ended

Sep. 29, 2013

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on a Recurring Basis

Assets measured at fair value on a recurring basis as of September 29, 2013 and March 31, 2013 are as follows:

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
	(In thousands)
September 29, 2013
Cash and cash equivalents	$	86,507	$	—	$	—	$	86,507
Marketable securities:
U.S. government and agency securities		83,359		—		—		83,359
Corporate debt obligations		—		167,055		—		167,055
Mortgage-backed securities		—		52,387		—		52,387
Municipal bonds		—		41,007		—		41,007
Other debt securities		—		2,693		—		2,693
		83,359		263,142		—		346,501
	$	169,866	$	263,142	$	—	$	433,008
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