Acquisition Details (Details) - USD ($)	3 Months Ended							12 Months Ended
	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Sep. 27, 2015	Mar. 29, 2015	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Business Acquisition [Line Items]
Deferred income taxes										$ 1,526,000
Acquisition-related costs	$ 800,000	$ 500,000	$ 200,000	$ 400,000	$ 800,000	$ 100,000	$ 200,000
Income tax expense, valuation allowance	30,400,000							$ 30,374,000	$ (2,959,000)	(24,326,000)
2016 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition								28,600,000
Deferred income taxes	1,803							1,803
Acquisition-related costs								1,600,000
2015 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition								70,400,000	12,900,000
Deferred income taxes	$ 3,311							3,311
Acquisition-related costs								$ 200,000	1,000,000
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Revenue of acquired restaurants since acquisition									144,600,000	34,000,000
Deferred income taxes					$ 7,221				7,221
Acquisition-related costs									$ 200,000	$ 1,900,000
Off-Market Favorable Lease [Member] | 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								15 years 5 months
Off-Market Favorable Lease [Member] | 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									15 years 6 months
Off-Market Favorable Lease [Member] | 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life										13 years 5 months
Above Market Leases [Member] | 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								12 years
Above Market Leases [Member] | 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									6 years 6 months
Above Market Leases [Member] | 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life										15 years
Franchise Rights [Member] | 2016 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life								28 years
Franchise Rights [Member] | 2015 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life									26 years 7 months
Franchise Rights [Member] | 2014 Acquisitions [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life										30 years 5 months