Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 01, 2012	Dec. 26, 2010	Jan. 01, 2012	Dec. 26, 2010
Condensed Consolidated Statements of Income [Abstract]
Net revenues	$ 152,661	$ 155,771	$ 454,463	$ 444,909
Cost of revenues	52,055	53,000	154,010	153,112
Gross profit	100,606	102,771	300,453	291,797
Operating expenses:
Engineering and development	36,883	33,148	112,446	100,649
Sales and marketing	21,514	20,103	63,219	60,953
General and administrative	8,803	9,061	26,820	25,560
Special charges				931
Total operating expenses	67,200	62,312	202,485	188,093
Operating income	33,406	40,459	97,968	103,704
Interest and other income, net	798	773	2,926	4,258
Income before income taxes	34,204	41,232	100,894	107,962
Income taxes	4,179	(9,107)	9,789	2,188
Net income	$ 30,025	$ 50,339	$ 91,105	$ 105,774
Net income per share:
Basic	$ 0.30	$ 0.48	$ 0.89	$ 0.97
Diluted	$ 0.30	$ 0.47	$ 0.88	$ 0.96
Number of shares used in per share calculations:
Basic	100,135	105,830	102,696	108,492
Diluted	100,668	107,327	103,340	110,032