Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2017 USD ($)	Jul. 03, 2016 USD ($)	Jul. 02, 2017 USD ($)	Jul. 03, 2016 USD ($)	Jan. 01, 2017 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment and other lease charges	$ 432	$ 286	$ 963	$ 508
Asset Impairment Charges	200	$ 500	$ 600	$ 600
Asset Impairment Charges, Number of Restaurants			3
Other lease charges			$ 118		$ (89)
Other Lease Charges, Number of Restaurants		3	3
Provisions for restaurant closures			$ 179		$ 59
Previously Impaired [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges			400
Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Asset Impairment Charges			200
Closed Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Other lease charges	$ 200	$ (200)
Provisions for restaurant closures			$ 400