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SUPPLEMENTAL CASH FLOW DISCLOSURE (Variations in non-cash transactions) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Cash flow statement [Abstract]    
Additions to property, plant and equipment and intangible assets included in accounts payable and accrued liabilities $ 4,977 $ 258
Proceeds on disposal of property, plant and equipment included in other current assets (86) 36
Impact of adoption of new accounting standards (note 2(d)) (1,515) 0
Balance due on business acquisitions (note 5) 0 2,700
Non-cash ascribed value credited to contributed surplus for dividends attributed to Treasury RSUs 6,681 9,623
Non-cash ascribed value credited to share capital from shares issued or distributed pursuant to vesting of restricted share units and exercise of stock options $ 754 $ 447