Impairment Of Long-Lived Assets And Other Lease Charges Closed Restaurant Reserve Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014
Restructuring Reserve [Roll Forward]
Closed-restaurant reserve, beginning of the period		$ 1,721	$ 1,466	$ 1,466
Provision for restaurant closures	$ 300	1,500	$ 800
Payments, net		(1,003)		(721)
Other adjustments, including the effect of discounting further obligations and changes in estimates		157		165
Closed-restaurant reserve, end of the period		2,302		1,721
Provisions for closures [Member]
Restructuring Reserve [Roll Forward]
Provision for restaurant closures		1,472		724
Changes in estimates [Member]
Restructuring Reserve [Roll Forward]
Provision for restaurant closures		$ (45)		$ 87