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Supplemental Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
Quarter endedTwo quarters ended
June 30, 2018July 1, 2017June 30, 2018July 1, 2017
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Changes in non-cash working capital:
Accounts receivable5,39818,768(6,961)7,641
Inventories(53,256)(32,271)(34,954)(5,913)
Income tax recoverable/payable(1,134)(3,339)2,207(4,799)
Prepaid expenses and other current assets4,322(4,813)(1,054)(9,546)
Accounts payable and accrued liabilities5,650(5,715)6,0316,695
Customer and other deposits696(3,278)(704)(1,391)
(38,324)(30,648)(35,435)(7,313)