Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010
Revenues	$ 491,625	$ 493,341	$ 441,020
Cost of revenues	193,179	169,097	161,267
Gross margin	298,446	324,244	279,753
Operating expenses:
Research and development	135,953	123,821	104,394
Selling, general and administrative	112,419	113,752	108,848
Operating expenses	248,372	237,573	213,242
Operating income	50,074	86,671	66,511
Other income (expense):
Interest income	1,859	2,318	2,725
Interest expense	(37)	(77)	(180)
Other income (expense), net	444	(1,253)	(90)
Income before income taxes	52,340	87,659	68,966
Provision (benefit) for income taxes	16,868	14,417	(4,126)
Net income	$ 35,472	$ 73,242	$ 73,092
Earnings per share:
Basic (in dollars per share)	$ 0.82	$ 1.63	$ 1.62
Diluted (in dollars per share)	$ 0.79	$ 1.57	$ 1.57
Weighted-average common shares outstanding:
Basic (in shares)	43,421	44,845	45,023
Diluted (in shares)	44,832	46,742	46,542