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Fair Value Measurement (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2019
USD ($)
Jun. 25, 2019
USD ($)
item
Dec. 25, 2018
USD ($)
Fair value of financial instruments      
Transfer of asset levels within the fair value hierarchy $ 0 $ 0  
Minimum number of investment funds in rabbi trust for deferred compensation plan | item   1  
Fair value measured on a recurring basis | Level 1      
Fair value of financial instruments      
Deferred compensation plan - assets 39,382 $ 39,382 $ 31,632
Deferred compensation plan - liabilities $ (39,481) $ (39,481) $ (31,721)