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Inventories (Tables)
6 Months Ended
Jun. 27, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
  June 27, 2020  December 28, 2019 
  $  $ 
Raw materials and work-in-process 255,863  259,658 
Finished goods 74,468  75,112 
Inventory reserves (12,329) (11,224)
  318,002  323,546