Acquisition Table of 2014 Acquisitions (Details)	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									$ 52,750,000	$ 52,200,000	$ 0
Proceeds from sale-leaseback transactions									$ 9,148,000	$ 19,565,000	$ 3,144,000
Acquisition-related costs	$ 800,000	$ 100,000		$ 200,000	$ 1,200,000	$ 400,000	$ 200,000	$ 100,000
April 30, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired										4
Payments to Acquire Businesses, Net of Cash Acquired										$ 681,000
June 30, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired										4
Properties purchased for sale-leaseback, number										1
Payments to Acquire Businesses, Net of Cash Acquired										$ 3,819,000
July 22, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired										21
Payments to Acquire Businesses, Net of Cash Acquired										$ 8,609,000
October 8, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired										30
Properties purchased for sale-leaseback, number										12
Payments to Acquire Businesses, Net of Cash Acquired										$ 20,330,000
November 4, 2014 Acquisition [Member]
Business Acquisition [Line Items]
Restaurants Acquired										64
Payments to Acquire Businesses, Net of Cash Acquired										$ 18,761,000
Restaurants to be remodeled										46
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Properties purchased for sale-leaseback, number										13
Properties sold in sale-leaseback transactions					10				1
Proceeds from sale-leaseback transactions					$ 12,961,000				$ 1,123,000
Revenue of acquired restaurants since acquisition									144,600,000	$ 34,000,000
Acquisition-related costs									$ 200,000	$ 1,900,000