Marketable Securities (Schedule Of Unrealized Losses By Investment Category) (Details) (USD $) In Thousands	Jul. 03, 2011	Apr. 03, 2011
Fair value of less than 12 months investment	$ 93,058	$ 96,164
Unrealized losses of less than 12 months investment	(238)	(560)
Fair value, Total	93,058	96,164
Unrealized losses, Total	(238)	(560)
U.S. Government And Agency Securities [Member]
Fair value of less than 12 months investment	23,576	25,712
Unrealized losses of less than 12 months investment	(22)	(216)
Fair value, Total	23,576	25,712
Unrealized losses, Total	(22)	(216)
Corporate Debt Obligations [Member]
Fair value of less than 12 months investment	56,756	60,595
Unrealized losses of less than 12 months investment	(145)	(282)
Fair value, Total	56,756	60,595
Unrealized losses, Total	(145)	(282)
Asset And Mortgage-Backed Securities [Member]
Fair value of less than 12 months investment	11,479	7,991
Unrealized losses of less than 12 months investment	(67)	(52)
Fair value, Total	11,479	7,991
Unrealized losses, Total	(67)	(52)
Municipal Bonds [Member]
Fair value of less than 12 months investment	1,247	1,866
Unrealized losses of less than 12 months investment	(4)	(10)
Fair value, Total	1,247	1,866
Unrealized losses, Total	$ (4)	$ (10)