Acquisition of Franchised Restaurants Acquisition of Franchised Restaurants (Details)		9 Months Ended
	Jul. 02, 2014 USD ($) restaurant	Sep. 29, 2015 USD ($)	Sep. 30, 2014 USD ($)	Dec. 30, 2014 USD ($)
Business Acquisition [Line Items]
Total purchase price of restaurants acquired		$ 628,000	$ 13,623,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Goodwill		$ 6,400,000		$ 6,400,000
Restaurants from Franchisees [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired | restaurant	16
Total purchase price of restaurants acquired	$ 13,600,000
Acquisition costs incurred	60,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Inventories	292,000
Prepaid expenses and other assets	27,000
Property and equipment	5,649,000
Intangibles	1,421,000
Goodwill	6,400,000
Deferred Rent and Other Liabilities	(154,000)
Total purchase price	$ 13,635,000