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Divestitures - Assets Held for Sale (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 01, 2018 restaurant	Dec. 31, 2017 USD ($)	Dec. 25, 2016 USD ($)	Jan. 02, 2018 USD ($)
Assets Held for Sale disclosures
Impairment loss		$ 1,674	$ 1,350
Assets classified as held for sale
Total assets held for sale		6,133		$ 6,133
China Operations
Assets Held for Sale disclosures
Impairment loss		1,700	$ 1,400
Assets classified as held for sale
Cash		908
Inventories		505
Prepaid expenses		570
Net property and equipment		4,878
Other assets		946
Valuation allowance		(1,674)
Total assets held for sale		6,133
Liabilities classified as held for sale
Accounts payable		1,817
Accrued and other liabilities		470
Total liabilities held for sale		$ 2,287
Stores in Denver, Colorado market
Liabilities classified as held for sale
Number of restaurants divested \| restaurant	31
Ownership share in stores refranchised (as a percent)	60.00%