Acquisitions and Divestitures - Assets Held for Sale (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2015 restaurant	Dec. 25, 2016 USD ($) restaurant	Dec. 25, 2016 USD ($) restaurant	Dec. 27, 2015 USD ($)	Dec. 28, 2014 USD ($) restaurant
Sale of restaurants
Number of Restaurants Sold | restaurant			42
Gain (loss) on assets transferred to held for sale			$ 11,600,000
Assets classified as held for sale
Inventories		$ 621,000	621,000
Prepaid expenses		517,000	517,000
Net property and equipment		4,767,000	4,767,000
Other assets		568,000	568,000
Valuation allowance		(216,000)	(216,000)
Total assets held for sale		$ 6,257,000	6,257,000	$ 9,299,000
Income statement disclosures related to operations held for sale
Reclassification to assets held for sale			979,000	(1,690,000)
Impairment charge			1,400,000
International
Income statement disclosures related to operations held for sale
Reclassification to assets held for sale			979,000	(1,690,000)
China Operations
Income statement disclosures related to operations held for sale
Reclassification to assets held for sale			979,000
Impairment charge			1,400,000
China Operations | International
Sale of restaurants
Gain (loss) on assets transferred to held for sale			0
Number of restaurants expects to be sold | restaurant	42
Assets classified as held for sale
Inventories				667,000
Prepaid expenses				672,000
Net property and equipment				5,571,000
Goodwill				1,690,000
Other assets				699,000
Total assets held for sale				9,299,000
Income statement disclosures related to operations held for sale
Income (loss) before income taxes			$ (2,300,000)	$ (1,200,000)	$ (3,400,000)
Impairment charge					$ 1,000,000
Number of restaurants for which impairment charges recorded | restaurant					11
Phoenix, AZ
Sale of restaurants
Number of Restaurants Sold | restaurant		42
Total consideration received		$ 16,800,000
Gain (loss) on assets transferred to held for sale		$ 11,600,000