Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) $ in Thousands		12 Months Ended
	Jun. 15, 2018 USD ($) restaurant	Dec. 27, 2020 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)
Consolidated Statements of Comprehensive Income (Unaudited)
Income tax expense (benefit)		$ 14,748	$ (611)	$ 2,624
Stores in Beijing and Tianjin, China
Consolidated Statements of Comprehensive Income (Unaudited)
Number of Restaurants Sold | restaurant	34
Other Comprehensive Income (Loss), Foreign Currency Transaction And Translation Reclassification Adjustment From AOCI	$ 1,300
Reversal of deferred tax related to foreign currency translation on refranchised stores	$ (300)
Interest expense | Interest rate swap
Consolidated Statements of Comprehensive Income (Unaudited)
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income		(5,068)	660	(22)
Qualifying as hedges | Interest rate swap | Amount reclassified from AOCL
Consolidated Statements of Comprehensive Income (Unaudited)
Income tax expense (benefit)		(1,140)	152	(5)
Qualifying as hedges | Interest expense | Interest rate swap | Amount reclassified from AOCL
Consolidated Statements of Comprehensive Income (Unaudited)
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income		$ (5,068)	$ 660	$ (22)