Basis Of Presentation Narrative (Details)	3 Months Ended							12 Months Ended
	Jan. 01, 2017 USD ($)	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016 USD ($)	Sep. 27, 2015	Jun. 28, 2015	Jan. 01, 2017 USD ($)	Jan. 03, 2016 USD ($)	Dec. 28, 2014 USD ($)	Dec. 30, 2012	Mar. 29, 2015
Entity Information [Line Items]
Restaurants Acquired	27	11	6	12	46	5	4	56	55	123	278
Number of Restaurants	753	734	723	717	705	660	657	753	705			659
Number of states	16							16
Weeks In fiscal period					14			52	53	52
Franchise Term Renewal Period								20 years
Franchise Agreement, Term								20 years
Long-term Debt, Fair Value	$ 216,500,000				$ 212,000,000			$ 216,500,000	$ 212,000,000
Asset Impairment Charges								1,000,000	$ 1,500,000	$ 2,600,000
Cash, FDIC Insured Amount	$ 250,000							$ 250,000
Number of Reportable Segments								1
Right of First Refusal, Number of States	20							20
Minimum [Member]
Entity Information [Line Items]
Weeks In fiscal period								52
Maximum [Member]
Entity Information [Line Items]
Weeks In fiscal period								53