Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Consolidated Statements of Income
Revenues	$ 563,294	$ 491,625	$ 493,341
Cost of revenues	225,277	193,179	169,097
Gross margin	338,017	298,446	324,244
Operating expenses:
Research and development	137,952	135,953	123,821
Selling, general and administrative	114,390	112,419	113,752
Operating expenses	252,342	248,372	237,573
Operating income	85,675	50,074	86,671
Other income (expense):
Interest income	1,338	1,859	2,318
Interest expense	(1,149)	(37)	(77)
Other income (expense), net	484	444	(1,253)
Income before income taxes	86,348	52,340	87,659
Provision for income taxes	22,800	16,868	14,417
Net income	$ 63,548	$ 35,472	$ 73,242
Earnings per share:
Basic (in dollars per share)	$ 1.51	$ 0.82	$ 1.63
Diluted (in dollars per share)	$ 1.47	$ 0.79	$ 1.57
Weighted-average common shares outstanding:
Basic (in shares)	42,136	43,421	44,845
Diluted (in shares)	43,106	44,832	46,742