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Property, Plant and Equipment (PPE By Type) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 25, 2020
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 875,273 $ 738,381
Accumulated depreciation (424,212) (387,631)
Net property, plant and equipment 451,061 350,750
Land and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 42,195 26,529
Buildings and improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 280,947 277,449
Manufacturing equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 384,617 340,838
Office, warehouse and automotive equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 61,994 54,211
Additions in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 105,520 $ 39,354