Condensed Consolidated Statements of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Revenues	$ 119,100	$ 120,154	$ 364,933	$ 381,450
Cost of revenues	46,203	41,484	143,666	128,297
Gross margin	72,897	78,670	221,267	253,153
Operating expenses:
Research and development	31,715	30,769	101,248	91,200
Selling, general and administrative	27,254	28,556	85,168	86,296
Operating expenses	58,969	59,325	186,416	177,496
Operating income	13,928	19,345	34,851	75,657
Other income (expense):
Interest income	388	540	1,432	1,839
Interest expense	(4)	(21)	(14)	(66)
Other income (expense), net	(81)	(394)	292	(1,277)
Income before income taxes	14,231	19,470	36,561	76,153
Provision for income taxes	2,976	1,237	13,894	15,794
Net income	$ 11,255	$ 18,233	$ 22,667	$ 60,359
Earnings per share:
Basic (in dollars per share)	$ 0.26	$ 0.41	$ 0.52	$ 1.34
Diluted (in dollars per share)	$ 0.26	$ 0.40	$ 0.50	$ 1.28
Weighted-average common shares outstanding:
Basic (in shares)	42,834	44,341	43,902	45,182
Diluted (in shares)	43,919	46,009	45,305	47,103