Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 26, 2021	Jun. 27, 2020
Income Statement [Abstract]
Net sales	$ 277,253	$ 242,573
Cost of sales	137,307	115,101
Gross profit	139,946	127,472
Operating expenses
Research and development	85,696	78,741
Selling, general and administrative	35,147	29,704
Restructuring costs	0	352
Total operating expenses	120,843	108,797
Income from operations	19,103	18,675
Interest income	1,020	1,835
Interest expense	(259)	(259)
Other income (expense)	(242)	111
Income before income taxes	19,622	20,362
Provision for income taxes	2,413	2,153
Net income	$ 17,209	$ 18,209
Basic earnings per share (in dollars per share)	$ 0.30	$ 0.31
Diluted earnings per share (in dollars per share)	$ 0.29	$ 0.30
Basic weighted average common shares outstanding (in shares)	57,582	58,313
Diluted weighted average common shares outstanding (in shares)	59,513	60,280