Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Apr. 03, 2011
Schedule of Unrealized Losses by Investment Category
Fair value of less than 12 months	$ 158,210	$ 96,164
Unrealized losses of less than 12 months	(315)	(560)
Fair Value of 12 months or greater	139
Unrealized losses of 12 months or Greater	(4)
Fair value, Total	158,349	96,164
Unrealized losses, Total	(319)	(560)
U.S. Government and agency securities [Member]
Schedule of Unrealized Losses by Investment Category
Fair value of less than 12 months	76,239	25,712
Unrealized losses of less than 12 months	(78)	(216)
Fair value, Total	76,239	25,712
Unrealized losses, Total	(78)	(216)
Corporate debt obligations [Member]
Schedule of Unrealized Losses by Investment Category
Fair value of less than 12 months	66,997	60,595
Unrealized losses of less than 12 months	(166)	(282)
Fair value, Total	66,997	60,595
Unrealized losses, Total	(166)	(282)
Asset and mortgage-backed securities [Member]
Schedule of Unrealized Losses by Investment Category
Fair value of less than 12 months	12,996	7,991
Unrealized losses of less than 12 months	(69)	(52)
Fair Value of 12 months or greater	139
Unrealized losses of 12 months or Greater	(4)
Fair value, Total	13,135	7,991
Unrealized losses, Total	(73)	(52)
Municipal bonds [Member]
Schedule of Unrealized Losses by Investment Category
Fair value of less than 12 months	1,978	1,866
Unrealized losses of less than 12 months	(2)	(10)
Fair value, Total	1,978	1,866
Unrealized losses, Total	$ (2)	$ (10)