Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 31, 2010
Net income	$ 37,225	$ 32,695	$ 27,521
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $(184), $(8), and $146, respectively	249	(72)	(53)
Unrealized (loss) gain arising during the period on investments, net of tax of $19, $(36), and $21, respectively	(28)	52	(31)
Comprehensive income	$ 37,446	$ 32,675	$ 27,437