Consolidated Statements of Comprehensive Income (Parenthetical) $ in Thousands		3 Months Ended	12 Months Ended
	Jun. 15, 2018 USD ($) restaurant	Apr. 01, 2018 USD ($)	Dec. 30, 2018 USD ($) restaurant	Dec. 31, 2017 USD ($)	Dec. 25, 2016 USD ($)
Consolidated Statements of Comprehensive Income (Unaudited)
Net Interest expense			$ 25,306	$ 11,283	$ 7,397
Income tax effects			$ 2,646	33,817	49,717
Stores in Beijing and Tianjin, China
Consolidated Statements of Comprehensive Income (Unaudited)
Number of restaurants divested | restaurant	34		34
Reversal of accumulated other comprehensive income related to foreign currency translation	$ 1,300		$ 1,300
Reversal of deferred tax related to foreign currency translation on refranchised stores	$ 300
Amount reclassified from AOCI | ASU 2018-02
Consolidated Statements of Comprehensive Income (Unaudited)
Income tax effects		$ 455
Qualifying as hedges | Interest rate swap | Amount reclassified from AOCI
Consolidated Statements of Comprehensive Income (Unaudited)
Net Interest expense			22	421	1,161
Income tax effects			$ 5	$ 156	$ 429