Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Change in foreign currency translation adjustment before reclassifications	$ 1,670	$ (1,102)	$ (1,214)
Foreign currency translation adjustment	$ (2,610)	$ (4,280)	$ (3,178)