Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Net sales	$ 242,573	$ 238,253
Cost of sales	115,101	115,759
Gross profit	127,472	122,494
Operating expenses
Research and development	78,741	88,830
Selling, general and administrative	29,704	29,520
Restructuring costs	352	0
Total operating expenses	108,797	118,350
Income from operations	18,675	4,144
Interest income	1,835	2,544
Interest expense	(259)	(259)
Other income (expense)	111	(378)
Income before income taxes	20,362	6,051
Provision for income taxes	2,153	1,433
Net income	$ 18,209	$ 4,618
Basic earnings per share (in dollars per share)	$ 0.31	$ 0.08
Diluted earnings per share (in dollars per share)	$ 0.30	$ 0.08
Basic weighted average common shares outstanding (in shares)	58,313	58,540
Diluted weighted average common shares outstanding (in shares)	60,280	60,258