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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 26, 2020
Dec. 28, 2019
Current inventory:    
Raw materials $ 61,705 $ 61,522
Work in process 14,287 12,631
Finished goods 47,839 31,885
Total current inventory 123,831 106,038
Long term inventory 15,327 10,048
Total inventory $ 139,158 $ 116,086