Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 26, 2011	Mar. 27, 2010
Consolidated Statements Of Operations [Abstract]
Net sales	$ 426,843	$ 369,571	$ 220,989
Cost of sales	196,402	167,576	102,258
Gross Margin	230,441	201,995	118,731
Operating expenses:
Research and development	85,697	63,934	51,421
Selling, general and administrative	65,208	58,734	43,306
Patent agreement, net		(4,000)	(1,400)
Total operating expenses	150,905	118,668	93,327
Income from operations	79,536	83,327	25,404
Interest income	517	860	1,345
Other income (expense), net	(70)	27	(66)
Income before income taxes	79,983	84,214	26,683
Benefit for income taxes	(8,000)	(119,289)	(11,715)
Net income	$ 87,983	$ 203,503	$ 38,398
Basic earnings per share:	$ 1.35	$ 3.00	$ 0.59
Diluted earnings per share:	$ 1.29	$ 2.82	$ 0.59
Basic weighted average common shares outstanding:	64,934	67,857	65,338
Diluted weighted average common shares outstanding:	68,063	72,103	65,626