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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2018
Dec. 26, 2017
Accumulated Other Comprehensive Loss    
Balance as of beginning of period $ 839,079  
Balance as of end of period 945,569 $ 839,079
Accumulated Other Comprehensive Loss    
Accumulated Other Comprehensive Loss    
Balance as of beginning of period (39) (194)
Other comprehensive loss (242) 252
Income taxes 53 (97)
Balance as of end of period $ (228) $ (39)