Acquisition Purchase Price Allocation, 2015 Acquisitions (Details) $ in Thousands	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	$ 1,267	$ 558
Land and building	22,614	15,955	19,387
Restaurant equipment	2,844	5,818	1,599
Restaurant equipment - subject to capital lease	443	1,381	435
Leasehold improvements	1,770	1,804	2,464
Franchise fees	1,000	3,064	1,121
Franchise rights	20,666	17,098	21,202
Favorable leases	1,475	2,096	390
Goodwill	20,438	17,793	22,869
Capital lease obligation for restaurant equipment	(494)	(1,458)	(492)
Unfavorable leases	(324)	(5,912)	(1,152)
Other liabilities	(433)	(135)	(71)
Purchase price	52,750	$ 52,200	48,088
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Goodwill	$ 2,645		$ 20,438