Consolidated Condensed Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Consolidated Condensed Statements Of Comprehensive Income [Abstract]
Net sales	$ 193,774	$ 101,602	$ 292,780	$ 193,844
Cost of sales	93,687	47,247	139,253	91,780
Gross margin	100,087	54,355	153,527	102,064
Operating expenses
Research and development	29,468	19,682	54,378	38,449
Selling, general and administrative	20,194	16,760	38,253	31,366
Total operating expenses	49,662	36,442	92,631	69,815
Income from operations	50,425	17,913	60,896	32,249
Interest income, net	131	112	258	266
Other income (expense), net	(40)	(27)	(63)	(44)
Income before income taxes	50,516	17,998	61,091	32,471
Provision for income taxes	15,067	6,751	18,715	12,046
Net income	35,449	11,247	42,376	20,425
Change in unrealized gain (loss) on marketable securities	17	(135)	19	(131)
Change in unrealized loss on foreign currency translation adjustments	0	0	0	0
Comprehensive income	$ 35,466	$ 11,112	$ 42,395	$ 20,294
Basic earnings per share	$ 0.55	$ 0.17	$ 0.65	$ 0.31
Diluted earnings per share	$ 0.51	$ 0.17	$ 0.61	$ 0.30
Basic weighted average common shares outstanding	64,924	64,426	64,697	65,763
Diluted weighted average common shares outstanding	69,207	67,265	68,920	68,657