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Inventories
9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Inventories [Text Block]

6.  Inventories 

  September 26,
2020
  December 28,
2019
 
  $  $ 
Raw materials and work-in-process 238,198  259,658 
Finished goods 82,940  75,112 
Inventory reserves (10,794) (11,224)
  310,344  323,546