Notes Receivable (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 28, 2014	Dec. 29, 2013
Notes receivable
Balance at the end of the period	$ 3,132	$ 3,387
Reserve for franchisee notes receivable
Notes receivable
Balance at the beginning of the period	3,387	5,028
Recovered from costs and expenses	(502)	(495)
Additions (deductions) including or net of notes written off	247	(1,146)
Balance at the end of the period	$ 3,132	$ 3,387