Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 26, 2020	Dec. 28, 2019
Income Statement [Abstract]
Net sales	$ 485,795	$ 374,668	$ 1,075,693	$ 1,001,833
Cost of sales	234,295	177,163	516,511	473,901
Gross profit	251,500	197,505	559,182	527,932
Operating expenses
Research and development	89,435	88,713	252,986	265,782
Selling, general and administrative	32,415	36,113	93,366	98,651
Restructuring costs	0	0	352	0
Total operating expenses	121,850	124,826	346,704	364,433
Income from operations	129,650	72,679	212,478	163,499
Interest income	1,465	2,651	4,958	7,725
Interest expense	(259)	(259)	(798)	(798)
Other income (expense)	(207)	(563)	688	(1,509)
Income before income taxes	130,649	74,508	217,326	168,917
Provision for income taxes	16,281	5,996	25,263	19,577
Net income	$ 114,368	$ 68,512	$ 192,063	$ 149,340
Basic earnings per share (in dollars per share)	$ 1.97	$ 1.18	$ 3.30	$ 2.56
Diluted earnings per share (in dollars per share)	$ 1.91	$ 1.13	$ 3.20	$ 2.47
Basic weighted average common shares outstanding (in shares)	58,024	58,188	58,176	58,247
Diluted weighted average common shares outstanding (in shares)	59,963	60,492	60,101	60,395