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Condensed Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2019
Jun. 26, 2018
Jun. 25, 2019
Jun. 26, 2018
Consolidated Statements of Income and Comprehensive Income        
Foreign currency translation adjustment, (tax)/benefit $ 28 $ 40 $ (5) $ (9)