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Leases - Finance leases (Details) - USD ($)
$ in Thousands
Mar. 26, 2020
Dec. 26, 2019
Fixed assets    
Property, Plant and Equipment, Gross $ 1,541,758 $ 1,533,832
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (629,490) (610,578)
Property, Plant and Equipment, Net 912,268 $ 923,254
Finance Leased Assets [Member]    
Fixed assets    
Property, Plant and Equipment, Gross 74,382  
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (53,631)  
Property, Plant and Equipment, Net $ 20,751