Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	Dec. 28, 2014 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment Charges		$ 400	$ 800	$ 600
Previously Impaired [Member]
Restructuring Cost and Reserve [Line Items]
Impairment Charges	$ 300	100	600	300
Initial Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Impairment Charges		$ 300
Provisions for closures [Member]
Restructuring Cost and Reserve [Line Items]
Other lease charges	$ 300		$ 1,472	$ 400	$ 724
Closed Restaurants [Member]
Restructuring Cost and Reserve [Line Items]
Other Lease Charges, Number of Restaurants	2	3	10	1