Asset Disposals, Closure Costs and Restaurant Impairments (Details) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 29, 2015 USD ($) restaurant	Mar. 31, 2015 restaurant	Sep. 30, 2014 USD ($)	Mar. 31, 2010 restaurant	Sep. 29, 2015 USD ($)	Sep. 30, 2014 USD ($)
Property, Plant and Equipment Impairment or Disposal [Abstract]
Restaurant impairments	$ 16,213		$ 12		$ 22,157	$ 16
Loss on disposal of assets	204		141		524	421
Closure costs and other	62		98		134	221
Total	$ 16,479		$ 251		$ 22,815	$ 658
Number of Impaired restaurants | restaurant	25	8
Number of impaired restaurants expected to be closed | restaurant	10	5		1