Significant Accounting Policies - Noncontrolling Interests and Foreign Currency Translation (Details)		12 Months Ended
	Jun. 15, 2018 USD ($) restaurant	Dec. 30, 2018 USD ($) entity restaurant	Dec. 29, 2019 restaurant entity
Noncontrolling Interests
Number of joint ventures having noncontrolling interests | entity		3	4
Stores in Beijing and Tianjin, China
Noncontrolling Interests
Number of restaurants divested | restaurant	34	34
Reversal of accumulated other comprehensive income related to foreign currency translation | $	$ 1,300,000	$ 1,300,000
Reversal of deferred tax related to foreign currency translation | $		$ 300,000
Joint ventures
Noncontrolling Interests
Number of Restaurants | restaurant		183	192