Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 116,422	$ 125,871
Foreign currency translation	(7,337)	(9,449)
Goodwill, ending balance	$ 109,085	$ 116,422