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Inventories (Tables)
12 Months Ended
Dec. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
The components of inventories at December 26, 2020 and December 28, 2019 are as follows:
 
(in thousands)20202019
Raw materials$85,394 $76,732 
Work in process92,783 84,561 
Finished goods114,641 110,388 
Inventory reserves(34,816)(34,174)
Total$258,002 $237,507