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Supplemental Cash Flow Information
3 Months Ended
Mar. 30, 2019
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information [Text Block]

12.  Supplemental Cash Flow Information

          Quarter ended  
          March 30, 2019     March 31, 2018  
          $     $  
Changes in non-cash working capital:            
  Accounts receivable   4,211     (12,359 )
  Inventories   15,647     18,302  
  Income tax recoverable/payable   1,971     3,341  
  Prepaid expenses and other current assets   (4,621 )   (5,376 )
  Accounts payable and accrued liabilities   (12,507 )   381  
  Customer and other deposits   100     (1,400 )
          4,801     2,889