Acquisitions (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 24, 2013	Dec. 25, 2012 item
Purchase price allocated
Goodwill	$ 113,454,000	$ 113,435,000
Franchise restaurants in Illinois
Acquisitions
Number of franchise restaurants acquired		2
Purchase price allocated
Current assets	64,000
Property and equipment, net	304,000
Goodwill	2,759,000
Intangible asset	1,342,000
Current liabilities	(195,000)
Other liabilities	(64,000)
Purchase Price	4,210,000
Intangible assets weighted-average life	2 years 7 months 6 days
Amortization expense relating to the intangible asset	400,000
Expected annual amortization expense for 2013	600,000
Expected annual amortization expense for 2014	500,000
Expected annual amortization expense for 2015	200,000
Expected annual amortization expense for 2016	$ 100,000