Consolidated Condensed Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 24, 2017	Jun. 25, 2016
Income Statement [Abstract]
Net sales	$ 320,735	$ 259,428
Cost of sales	159,019	132,743
Gross profit	161,716	126,685
Operating expenses
Research and development	83,557	73,934
Selling, general and administrative	30,859	30,540
Total operating expenses	114,416	104,474
Income from operations	47,300	22,211
Interest income	929	267
Interest expense	(335)	(956)
Other income (expense)	(19)	147
Income before income taxes	47,875	21,669
Provision for income taxes	4,963	3,598
Net income	$ 42,912	$ 18,071
Basic earnings per share (in dollars per share)	$ 0.67	$ 0.29
Diluted earnings per share (in dollars per share)	$ 0.64	$ 0.27
Basic weighted average common shares outstanding	64,097	62,450
Diluted weighted average common shares outstanding	67,160	65,723