Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 02, 2017 USD ($)	Apr. 03, 2016 USD ($)	Jan. 01, 2017 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment and other lease charges	$ 531	$ 222
Asset Impairment Charges	$ 400	$ 200
Asset Impairment Charges, Number of Restaurants	3
Other lease charges	$ (7)		$ (89)
Provisions for restaurant closures	144		$ 59
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, Number of Restaurants	3
Provisions for restaurant closures	$ 100