Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 25, 2017	Mar. 26, 2016
Income Statement [Abstract]
Net sales	$ 1,532,186	$ 1,538,940	$ 1,169,251
Cost of sales	771,470	781,125	614,411
Gross profit	760,716	757,815	554,840
Operating expenses
Research and development	366,444	303,658	269,217
Selling, general and administrative	131,811	127,265	117,082
Asset impairment	0	9,842	0
Patent agreement and other	0	0	(11,670)
Total operating expenses	498,255	440,765	374,629
Income from operations	262,461	317,050	180,211
Interest income	4,762	1,676	877
Interest expense	(1,153)	(3,600)	(3,308)
Other expense	(971)	(79)	(1,791)
Income before income taxes	265,099	315,047	175,989
Provision for income taxes	103,104	53,838	52,359
Net income	$ 161,995	$ 261,209	$ 123,630
Basic earnings per share (in dollars per share)	$ 2.55	$ 4.12	$ 1.96
Diluted earnings per share (in dollars per share)	$ 2.46	$ 3.92	$ 1.87
Basic weighted average common shares outstanding (in shares)	63,407	63,329	63,197
Diluted weighted average common shares outstanding (in shares)	65,951	66,561	65,993