Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 11,945	$ 141,846	$ 346,722	$ 469,087
Other comprehensive income (loss), net of tax:
Change in net unrealized losses on available-for-sale securities	(7,502)	(20,030)	(1,566)	(17,799)
Reclassification adjustment for (gains) losses on available-for-sale securities	1,259	(170)	1,154	(587)
Change in net unrealized gains (losses) on hedging transactions	1,583	(3,059)	3,781	(3,742)
Reclassification adjustment for losses on hedging transactions	(1,018)	875	(3,022)	1,513
Cumulative translation adjustment, net	394	(2,848)	2,831	(3,195)
Other comprehensive loss	(5,284)	(25,232)	3,178	(23,810)
Total comprehensive income	$ 6,661	$ 116,614	$ 349,900	$ 445,277