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Inventories - Components of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 27, 2020
Dec. 28, 2019
Current inventory:    
Raw materials $ 62,475 $ 61,522
Work in process 15,161 12,631
Finished goods 30,887 31,885
Total current inventory 108,523 106,038
Long term inventory 20,358 10,048
Total inventory $ 128,881 $ 116,086