Acquisitions (Details) (Franchise restaurants in Illinois, USD $)	3 Months Ended	12 Months Ended
	Mar. 26, 2013	Dec. 25, 2012 item
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	2,849,000
Intangible asset	1,342,000
Current liabilities	(195,000)
Other liabilities	(64,000)
Purchase price paid	4,300,000
Intangible assets weighted-average life	2 years 7 months 6 days
Amortization expense relating to the intangible asset	100,000
Expected average annual expense for the next four years	$ 300,000