Consolidated Condensed Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Consolidated Statements of Comprehensive Income [Abstract]
Net sales	$ 152,565	$ 155,125
Cost of sales	77,190	75,627
Gross profit	75,375	79,498
Operating expenses:
Research and development	39,777	28,530
Selling, general and administrative	19,683	19,198
Patent infringement settlements, net		695
Restructuring and other		(430)
Total operating expenses	59,460	47,993
Income from operations	15,915	31,505
Interest income	195	158
Interest expense	(662)
Other income (expense)	501	(17)
Income before income taxes	15,949	31,646
Provision for income taxes	5,701	11,004
Net income	10,248	20,642
Change in unrealized gain (loss) on marketable securities	100	(40)
Tax effect of unrealized (gain) loss on marketable securities	(35)	67
Comprehensive income	$ 10,313	$ 20,669
Basic earnings per share	$ 0.17	$ 0.33
Diluted earnings per share	$ 0.16	$ 0.31
Basic weighted average common shares outstanding	62,032	63,363
Diluted weighted average common shares outstanding	64,688	66,188