Investments - Unrealized Losses and Fair Value (Details) - USD ($) $ in Thousands	Apr. 02, 2017	Apr. 03, 2016
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	$ 140,733	$ 44,483
Unrealized Loss Less than 12 months	(872)	(187)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	140,733	44,483
Unrealized Loss Total	(872)	(187)
Corporate bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	71,308	33,407
Unrealized Loss Less than 12 months	(326)	(179)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	71,308	33,407
Unrealized Loss Total	(326)	(179)
Asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	11,294	4,979
Unrealized Loss Less than 12 months	(23)	(7)
Fair Value 12 months or Greater	0
Unrealized Loss 12 Months or Greater	0
Fair Value Total	11,294	4,979
Unrealized Loss Total	(23)	(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	55,497	6,097
Unrealized Loss Less than 12 months	(508)	(1)
Fair Value 12 months or Greater	0	0
Unrealized Loss 12 Months or Greater	0	0
Fair Value Total	55,497	6,097
Unrealized Loss Total	(508)	$ (1)
International government bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Fair Value Less than 12 months	2,634
Unrealized Loss Less than 12 months	(15)
Fair Value 12 months or Greater	0
Unrealized Loss 12 Months or Greater	0
Fair Value Total	2,634
Unrealized Loss Total	$ (15)