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Inventories, net (Details) - USD ($)
$ in Thousands
Sep. 25, 2021
Dec. 26, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 55,352 $ 48,122
Work-in-progress 41,638 30,806
Finished goods 18,114 20,301
Inventories $ 115,104 $ 99,229