Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 24, 2016	Sep. 26, 2015	Sep. 24, 2016	Sep. 26, 2015
Consolidated Condensed Statements of Income [Abstract]
Net sales	$ 428,619	$ 306,756	$ 688,047	$ 589,389
Cost of sales	216,920	164,535	349,663	314,714
Gross profit	211,699	142,221	338,384	274,675
Operating expenses:
Research and development	75,673	67,258	149,607	133,093
Selling, general and administrative	32,089	30,103	62,629	59,222
Patent agreement and other		752		(11,748)
Total operating expenses	107,762	98,113	212,236	180,567
Income from operations	103,937	44,108	126,148	94,108
Interest income	296	215	563	469
Interest expense	(1,299)	(924)	(2,255)	(1,923)
Other expense	(261)	(416)	(114)	(173)
Income before income taxes	102,673	42,983	124,342	92,481
Provision for income taxes	24,608	8,103	30,413	24,247
Net income	$ 78,065	$ 34,880	$ 93,929	$ 68,234
Basic earnings per share	$ 1.24	$ 0.55	$ 1.50	$ 1.08
Diluted earnings per share	$ 1.19	$ 0.53	$ 1.43	$ 1.03
Basic weighted average common shares outstanding	62,787	63,346	62,618	63,310
Diluted weighted average common shares outstanding	65,717	66,329	65,521	66,378