Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Condensed Consolidated Statements of Income [Abstract]
Net revenues	$ 130,371	$ 144,481
Cost of revenues	43,313	44,868
Gross profit	87,058	99,613
Operating expenses:
Engineering and development	39,458	34,852
Sales and marketing	18,886	19,721
General and administrative	8,673	9,163
Total operating expenses	67,017	63,736
Operating income	20,041	35,877
Interest and other income, net	1,078	1,048
Income from continuing operations before income taxes	21,119	36,925
Income taxes	2,678	2,729
Income from continuing operations	18,441	34,196
Loss from discontinued operations, net of income taxes	(55)	(1,770)
Net income	$ 18,386	$ 32,426
Income from continuing operations per share:
Basic	$ 0.19	$ 0.33
Diluted	$ 0.19	$ 0.32
Loss from discontinued operations per share:
Basic		$ (0.02)
Diluted		$ (0.01)
Net income per share:
Basic	$ 0.19	$ 0.31
Diluted	$ 0.19	$ 0.31
Number of shares used in per share calculations:
Basic	97,405	104,679
Diluted	98,369	105,789