Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 51,417	$ 50,519	$ 67,974
Other comprehensive income (loss) – unrealized gain (loss) on available-for-sale marketable debt securities, net of income tax	14	20	(47)
Comprehensive income	$ 51,431	$ 50,539	$ 67,927