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BASIS OF PREPARATION BASIS OF PREPARATION (Narrative) (Details) - USD ($) | Dec. 29, 2019 | Dec. 31, 2018 | Dec. 30, 2018 | Jan. 01, 2018
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Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Lease liabilities | $ 81,500,000 |  |  |
Right-of-use assets | 73,539,000 |  | $ 0 |
Impact of initial application of new IFRS on retained earnings |  | $ 2,176,000 |  | $ 1,515,000
IFRS 16 |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Deferred lease credits related to lease inducements |  | 1,900,000 |  |
Prepaid rent transferred to right-of-use asset |  | 1,200,000 |  |
Non-current onerous contracts provision |  | 4,600,000 |  |
Decrease in Right-of-use assets |  | 1,200,000 |  |
Lease liabilities |  | 87,880,000 | $ 113,287,000 |
Right-of-use assets |  | 78,100,000 |  |
Net investment in sublease |  | 2,400,000 |  |
Impact of initial application of new IFRS on retained earnings |  | $ (2,200,000) |  |
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16 |  | 3.89% |  |
IFRS 15 |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Impact of initial application of new IFRS on retained earnings |  |  |  | 700,000
Impact of initial application of new IFRS on gross margin on net sales |  |  |  | 2,100,000
IFRS 9 |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Impact of initial application of new IFRS on retained earnings |  |  |  | $ 791,000
Interest rate risk | Cash flow hedges |  |  |  |
Disclosure of initial application of standards or interpretations [line items] |  |  |  |
Notional amount | $ 250,000,000 |  |  |

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- Definition Deferred lease credits related to lease inducements + References No definition available. + Details
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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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