Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015
Goodwill [Roll Forward]
Net goodwill, beginning balance	$ 171,119	$ 134,042
Goodwill acquired in business combinations	56,914	43,462
Goodwill from divestitures	(79)	(6,385)
Net goodwill, ending balance	$ 227,954	$ 171,119