Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2016 USD ($)	Sep. 27, 2015 USD ($)	Oct. 02, 2016 USD ($)	Sep. 27, 2015 USD ($)	Jan. 03, 2016 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment and other lease charges	$ 685	$ 396	$ 1,193	$ 2,732
Impairment Charges	300	$ 400		1,200
Loss on sale-leaseback	300
Other lease charges	$ 100		(80)		$ (95)
Provisions for restaurant closures			$ 0	1,500	$ 1,472
Previously Impaired [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment Charges				$ 1,000
Closed Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Other Lease Charges, Number of Restaurants				10