Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 29, 2018	Sep. 23, 2017	Sep. 29, 2018	Sep. 23, 2017
Income Statement [Abstract]
Net sales	$ 366,305	$ 425,537	$ 620,788	$ 746,272
Cost of sales	181,186	214,255	311,110	373,274
Gross profit	185,119	211,282	309,678	372,998
Operating expenses
Research and development	96,381	90,353	194,313	173,910
Selling, general and administrative	33,160	30,041	65,944	60,900
Total operating expenses	129,541	120,394	260,257	234,810
Income from operations	55,578	90,888	49,421	138,188
Interest income	1,805	1,005	3,511	1,934
Interest expense	(280)	(280)	(539)	(615)
Other expense	(378)	(1,116)	(168)	(1,135)
Income before income taxes	56,725	90,497	52,225	138,372
Provision (benefit) for income taxes	(1,448)	17,197	(1,676)	22,160
Net income	$ 58,173	$ 73,300	$ 53,901	$ 116,212
Basic earnings per share (in dollars per share)	$ 0.96	$ 1.16	$ 0.88	$ 1.82
Diluted earnings per share (in dollars per share)	$ 0.93	$ 1.10	$ 0.86	$ 1.74
Basic weighted average common shares outstanding (in shares)	60,472	63,431	60,967	63,764
Diluted weighted average common shares outstanding (in shares)	62,431	66,360	62,810	66,761