Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 27,354	$ 21,541	$ 13,809
Foreign currency translation adjustment	3,040	(3,577)	(1,807)
Total comprehensive income	$ 30,394	$ 17,964	$ 12,002