Acquisition Purchase Price Allocation, 2014 Acquisitions (Details)	12 Months Ended
	Jan. 03, 2016 USD ($)	Dec. 28, 2014 USD ($)	Jan. 01, 2017 USD ($)
Business Acquisition [Line Items]
Number of acquisitions	8	5
Inventory	$ 544,000	$ 1,267,000	$ 558,000
Land and building	22,614,000	15,955,000	19,387,000
Restaurant equipment	2,844,000	5,818,000	1,599,000
Restaurant equipment - subject to capital lease	443,000	1,381,000	435,000
Leasehold improvements	1,770,000	1,804,000	2,464,000
Franchise fees	1,000,000	3,064,000	1,121,000
Franchise rights	20,666,000	17,098,000	21,202,000
Favorable leases	1,475,000	2,096,000	390,000
Deferred income taxes		1,526,000
Other assets		65,000
Goodwill	20,438,000	17,793,000	22,869,000
Capital lease obligation for restaurant equipment	(494,000)	(1,458,000)	(492,000)
Unfavorable leases	(324,000)	(5,912,000)	(1,152,000)
Other liabilities	(433,000)	(135,000)	(71,000)
Purchase price	52,750,000	52,200,000	$ 48,088,000
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Deferred income taxes	$ 7,221
Goodwill		$ 9,631,000