Investments - Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Apr. 03, 2016	Mar. 29, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	$ 44,483	$ 101,588
Unrealized Loss Less than 12 months	(187)	(159)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	44,483	101,588
Unrealized Loss Total	(187)	(159)
Corporate bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	33,407	63,367
Unrealized Loss Less than 12 months	(179)	(121)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	33,407	63,367
Unrealized Loss Total	(179)	(121)
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	4,979	17,736
Unrealized Loss Less than 12 months	(7)	(9)
Fair Value 12 months or Greater	0
Unrealized Loss 12 Months or Greater	0
Fair Value Total	4,979	17,736
Unrealized Loss Total	(7)	(9)
U.S. government treasuries and agencies securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	6,097	18,478
Unrealized Loss Less than 12 months	(1)	(23)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	6,097	18,478
Unrealized Loss Total	$ (1)	(23)
Municipal bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months		1,001
Unrealized Loss Less than 12 months		(2)
Fair Value 12 months or Greater		0
Unrealized Loss 12 Months or Greater		0
Fair Value Total		1,001
Unrealized Loss Total		(2)
International government bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months		1,006
Unrealized Loss Less than 12 months		(4)
Fair Value 12 months or Greater		0
Unrealized Loss 12 Months or Greater		0
Fair Value Total		1,006
Unrealized Loss Total		$ (4)