Notes Receivable - Summary of Changes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015
Notes receivable
Balance at the beginning of the period	$ 3,653
Balance at the end of the period	2,759	$ 3,653
Reserve for franchisee notes receivable
Notes receivable
Balance at the beginning of the period	3,653	3,132
Recovered from costs and expenses	(250)	(100)
Additions (deductions) including or net of notes written off	(644)	621
Balance at the end of the period	$ 2,759	$ 3,653