Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Mar. 31, 2018
Components of accumulated other comprehensive income (loss)
Accumulated unrealized losses on available-for-sale securities, net of tax	$ (25,280)	$ (29,844)
Accumulated unrealized losses on hedging transactions, net of tax	(4,926)	1,674
Accumulated cumulative translation adjustment, net of tax	(10,532)	(6,339)
Accumulated other comprehensive income (loss)	$ (40,738)	$ (34,509)