Consolidated Condensed Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 29, 2013	Jun. 30, 2012
Consolidated Condensed Statements Of Comprehensive Income [Abstract]
Net sales	$ 155,125	$ 99,006
Cost of sales	75,627	45,566
Gross margin	79,498	53,440
Operating expenses
Research and development	28,530	24,910
Selling, general and administrative	19,198	18,059
Patent infringement settlements, net	695
Restructuring and other, net	(430)
Total operating expenses	47,993	42,969
Income from operations	31,505	10,471
Interest income, net	158	127
Other income (expense), net	(17)	(23)
Income before income taxes	31,646	10,575
Provision for income taxes	11,004	3,648
Net income	20,642	6,927
Change in unrealized gain on marketable securities	27	2
Comprehensive income	$ 20,669	$ 6,929
Basic earnings per share	$ 0.33	$ 0.11
Diluted earnings per share	$ 0.31	$ 0.10
Basic weighted average common shares outstanding	63,363	64,470
Diluted weighted average common shares outstanding	66,188	68,529