Acquisition Table of 2016 Acquisitions (Details) $ in Thousands	3 Months Ended						12 Months Ended
	Dec. 31, 2017	Jul. 02, 2017	Apr. 02, 2017	Oct. 02, 2016	Jul. 03, 2016	Jan. 03, 2016	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)	Dec. 30, 2012
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number								15
Restaurants Acquired	4	17	43	11	6	27	64	56	55	278
Purchase Price							$ 37,923	$ 48,088	$ 52,750
Proceeds from sale-leaseback transactions							$ 4,257	$ 53,599	$ 9,148
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions							14
Proceeds from sale-leaseback transactions							$ 19,100
February 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired								12
Purchase Price								$ 7,127
May 25, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number								5
Restaurants Acquired								6
Purchase Price								$ 12,080
July 14, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number								3
Restaurants Acquired								4
Purchase Price								$ 5,445
August 23, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number								6
Restaurants Acquired								7
Purchase Price								$ 8,755
October 4, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired								3
Purchase Price								$ 1,623
November 15, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired								17
Purchase Price								$ 7,251
December 1, 2016 Acquisition [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number								1
Restaurants Acquired								7
Purchase Price								$ 5,807