Fair Value Measurements (Tables)

9 Months Ended

Jan. 01, 2012

Fair Value Measurements [Abstract]

Schedule Of Assets Measured At Fair Value On A Recurring Basis

	Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total
January 1, 2012	(In thousands)
Cash and cash equivalents	$	70,189	$	4,009	$	—	$	74,198
Marketable securities:
U.S. government and agency securities		121,718		—		—		121,718
Corporate debt obligations		—		144,869		—		144,869
Asset and mortgage-backed securities		—		39,040		—		39,040
Municipal bonds		—		15,808		—		15,808
Certificates of deposit		192		—		—		192
		121,910		199,717		—		321,627
	$	192,099	$	203,726	$	—	$	395,825
April 3, 2011
Cash and cash equivalents	$	146,281	$	1,499	$	—	$	147,780
Marketable securities:
U.S. government and agency securities		55,753		—		—		55,753
Corporate debt obligations		—		138,436		—		138,436
Asset and mortgage-backed securities		—		22,490		—		22,490
Municipal bonds		—		17,941		—		17,941
Non-U.S. government and agency securities		—		1,676		—		1,676
		55,753		180,543		—		236,296
	$	202,034	$	182,042	$	—	$	384,076