Acquisition Table of 2015 Acquisitions (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2016 USD ($)	Sep. 27, 2015 USD ($)	Jun. 28, 2015	Mar. 29, 2015 USD ($)	Dec. 28, 2014 USD ($)	Sep. 28, 2014 USD ($)	Jun. 29, 2014 USD ($)	Mar. 30, 2014 USD ($)	Jan. 03, 2016 USD ($)	Dec. 28, 2014 USD ($)	Dec. 29, 2013 USD ($)
Business Acquisition [Line Items]
Restaurants Acquired	46	5	4		94	25	4		55	123
Payments to Acquire Businesses, Net of Cash Acquired									$ 52,750	$ 52,200	$ 0
Proceeds from sale-leaseback transactions									9,148	19,565	$ 3,144
Land and building	$ 22,614				$ 15,955				$ 22,614	$ 15,955
Acquisition-related costs	$ 800	$ 100		$ 200	$ 1,200	$ 400	$ 200	$ 100
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number									16
Properties sold in sale-leaseback transactions	3
Proceeds from sale-leaseback transactions	$ 4,300
Revenue of acquired restaurants since acquisition									$ 12,900
Acquisition-related costs									$ 1,000
March 31, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									4
Payments to Acquire Businesses, Net of Cash Acquired									$ 794
August 4, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									5
Payments to Acquire Businesses, Net of Cash Acquired									$ 663
October 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									5
Payments to Acquire Businesses, Net of Cash Acquired									$ 5,044
Properties purchased for sale-leaseback, number									1
October 20, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									1
Payments to Acquire Businesses, Net of Cash Acquired									$ 709
November 17, 2015 Acquisition 1 [Member]
Business Acquisition [Line Items]
Restaurants Acquired									2
Payments to Acquire Businesses, Net of Cash Acquired									$ 618
November 17, 2015 Acquisition 2 [Member]
Business Acquisition [Line Items]
Restaurants Acquired									6
Payments to Acquire Businesses, Net of Cash Acquired									$ 10,945
Properties purchased for sale-leaseback, number									5
December 1, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									23
Payments to Acquire Businesses, Net of Cash Acquired									$ 26,175
Properties purchased for sale-leaseback, number									10
December 8, 2015 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired									9
Payments to Acquire Businesses, Net of Cash Acquired									$ 7,802
Expected to be Sold in Next Fiscal Year [Member] | 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Properties sold in sale-leaseback transactions	13
Land and building	$ 18,300								$ 18,300