Consolidated Condensed Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jun. 25, 2011
Consolidated Condensed Statements Of Operations [Abstract]
Net sales	$ 99,006	$ 92,242
Cost of sales	45,566	44,533
Gross margin	53,440	47,709
Operating expenses
Research and development	24,910	18,767
Selling, general and administrative	18,059	14,606
Total operating expenses	42,969	33,373
Income from operations	10,471	14,336
Interest income, net	127	154
Other income (expense), net	(23)	(17)
Income before income taxes	10,575	14,473
Provision for income taxes	3,648	5,295
Net income	6,927	9,178
Change in unrealized gain on marketable securities	2	5
Change in unrealized loss on foreign currency translation adjustments	0	0
Comprehensive income	$ 6,929	$ 9,183
Basic net income per share	$ 0.11	$ 0.14
Diluted net income per share	$ 0.10	$ 0.13
Basic weighted average common shares outstanding	64,470	67,099
Diluted weighted average common shares outstanding	68,529	70,445