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FINANCIAL INSTRUMENTS (Carrying amounts and fair values) (Details) - USD ($) $ in Thousands | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Cash and cash equivalents (note 5) | $ 64,126 | $ 46,657 | $ 52,795
Trade accounts receivable (note 6) | 320,931 | 317,159 |
Financing arrangements | 39,600 | 33,000 |
Financial liabilities at amortised cost | Accounts payable and accrued liabilities (1) |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial liabilities, carrying value | 395,564 | 332,543 |
Financial liabilities, fair value | 395,564 | 332,543 |
Financial liabilities at amortised cost | Long-term debt | Effective interest rate |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial liabilities, carrying value | 645,000 | 469,000 |
Financial liabilities, fair value | 645,000 | 469,000 |
Financial liabilities at amortised cost | Long-term debt | Fixed interest rate |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial liabilities, carrying value | 200,000 | 200,000 |
Financial liabilities, fair value | 206,400 | 189,500 |
Derivative financial liabilities included in accounts payable and accrued liabilities |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial liabilities, carrying value | 11,067 | 14,442 |
Financial liabilities, fair value | 11,067 | 14,442 |
Financial assets at amortised cost | Cash and cash equivalents |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Cash and cash equivalents (note 5) | 64,126 | 46,657 |
Financial assets, fair value | 64,126 | 46,657 |
Financial assets at amortised cost | Trade accounts receivable |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Trade accounts receivable (note 6) | 320,931 | 317,159 |
Financial assets, fair value | 320,931 | 317,159 |
Financial assets at amortised cost | Financial assets included in prepaid expenses, deposits and other current assets |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial assets | 45,950 | 39,789 |
Financial assets, fair value | 45,950 | 39,789 |
Financial assets at amortised cost | Long-term non-trade receivables included in other non-current assets |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial assets | 2,933 | 2,771 |
Financial assets, fair value | 2,933 | 2,771 |
Derivative financial assets included in prepaid expenses, deposits and other current assets |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial assets | 9,816 | 17,792 |
Financial assets, fair value | 9,816 | 17,792 |
Derivative financial instruments included in prepaid expenses, deposits and other current assets - total return swap |  |  |
Disclosure Of Financial Assets And Liabilities [Line Items] |  |  |
Financial assets, fair value |  |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35H&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35I&doctype=Standard -URIDate 2019-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35M&doctype=Standard -URIDate 2019-03-27 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard -URIDate 2019-03-27 + Details
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