Basis Of Presentation (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2016 USD ($)	Sep. 27, 2015	Oct. 02, 2016 USD ($)	Sep. 27, 2015	Dec. 31, 2017	Jan. 03, 2016
Entity Information [Line Items]
Number of Restaurants	734		734
Number of States in which Entity Operates	16		16
Weeks In Fiscal Period	13	13	39	39		53
Long-term Debt, Fair Value	$ 216.3		$ 216.3
Minimum [Member]
Entity Information [Line Items]
Weeks In Fiscal Period			52
Maximum [Member]
Entity Information [Line Items]
Weeks In Fiscal Period			53
Subsequent Event [Member]
Entity Information [Line Items]
Weeks In Fiscal Period					52