Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 23, 2017	Sep. 24, 2016	Sep. 23, 2017	Sep. 24, 2016
Income Statement [Abstract]
Net sales	$ 425,537	$ 428,619	$ 746,272	$ 688,047
Cost of sales	214,255	216,920	373,274	349,663
Gross profit	211,282	211,699	372,998	338,384
Operating expenses
Research and development	90,353	75,673	173,910	149,607
Selling, general and administrative	30,041	32,089	60,900	62,629
Total operating expenses	120,394	107,762	234,810	212,236
Income from operations	90,888	103,937	138,188	126,148
Interest income	1,005	296	1,934	563
Interest expense	(280)	(1,299)	(615)	(2,255)
Other expense	(1,116)	(261)	(1,135)	(114)
Income before income taxes	90,497	102,673	138,372	124,342
Provision for income taxes	17,197	16,634	22,160	20,232
Net income	$ 73,300	$ 86,039	$ 116,212	$ 104,110
Basic earnings per share (in dollars per share)	$ 1.16	$ 1.37	$ 1.82	$ 1.66
Diluted earnings per share (in dollars per share)	$ 1.10	$ 1.30	$ 1.74	$ 1.58
Basic weighted average common shares outstanding (in shares)	63,431	62,787	63,764	62,618
Diluted weighted average common shares outstanding (in shares)	66,360	66,410	66,761	66,101