Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Consolidated Statements of Income
Revenues	$ 580,087	$ 563,294	$ 491,625
Cost of revenues	227,183	225,277	193,179
Gross margin	352,904	338,017	298,446
Operating expenses:
Research and development	157,799	137,952	135,953
Selling, general and administrative	130,795	114,390	112,419
Operating expenses	288,594	252,342	248,372
Operating income	64,310	85,675	50,074
Other income (expense):
Interest income	853	1,338	1,859
Interest expense	(3,293)	(1,149)	(37)
Other income (expense), net	157	484	444
Income before income taxes	62,027	86,348	52,340
Provision for income taxes	12,208	22,800	16,868
Net income	$ 49,819	$ 63,548	$ 35,472
Earnings per share:
Basic (in dollars per share)	$ 1.17	$ 1.51	$ 0.82
Diluted (in dollars per share)	$ 1.14	$ 1.47	$ 0.79
Weighted-average common shares outstanding:
Basic (in shares)	42,715	42,136	43,421
Diluted (in shares)	43,537	43,106	44,832