Investments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	$ 107,356	$ 42,813
Unrealized Loss Less than 12 months	(254)	(62)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 months or Greater	0	0
Fair Value Total	107,356	42,813
Unrealized Loss Total	(254)	(62)
Corporate bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	52,783	32,009
Unrealized Loss Less than 12 months	(127)	(50)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 months or Greater	0	0
Fair Value Total	52,783	32,009
Unrealized Loss Total	(127)	(50)
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	11,156	6,473
Unrealized Loss Less than 12 months	(9)	(7)
Fair Value 12 months or Greater	0
Unrealized Loss 12 months or Greater	0
Fair Value Total	11,156	6,473
Unrealized Loss Total	(9)	(7)
U.S. government treasuries and agencies securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	36,403	3,324
Unrealized Loss Less than 12 months	(91)	(1)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 months or Greater	0	0
Fair Value Total	36,403	3,324
Unrealized Loss Total	(91)	(1)
Municipal bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	4,000
Unrealized Loss Less than 12 months	(18)
Fair Value 12 months or Greater	0
Unrealized Loss 12 months or Greater	0
Fair Value Total	4,000
Unrealized Loss Total	(18)
International government bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	3,014	1,007
Unrealized Loss Less than 12 months	(9)	(4)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 months or Greater	0	0
Fair Value Total	3,014	1,007
Unrealized Loss Total	$ (9)	$ (4)