Fair Value Measurements (Tables)

3 Months Ended

Jul. 01, 2012

Fair Value Measurements [Abstract]

Schedule of Assets Measured at Fair Value of Debt Securities

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
	(In thousands)
July 1, 2012
Cash and cash equivalents	$	116,802	$	250	$	—	$	117,052
Marketable securities:
U.S. government and agency securities		130,531		—		—		130,531
Corporate debt obligations		—		171,580		—		171,580
Asset and mortgage-backed securities		—		49,097		—		49,097
Municipal bonds		—		28,082		—		28,082
		130,531		248,759		—		379,290
	$	247,333	$	249,009	$	—	$	496,342
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