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Inventories (Tables)
9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory
A summary of inventories follows (in thousands):
        
 September 26, 2020December 28, 2019
Finished product$235,134 $199,799 
Work in process92,201 81,841 
Raw material35,039 41,964 
Supplies and other44,431 39,353 
 $406,805 $362,957