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SHARE-BASED COMPENSATION (Deferred share unit plan Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares | Jan. 01, 2017 USD ($) shares | Jan. 03, 2016 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Compensation expense included in selling, general and administrative expenses | $ 16,065,000 | $ 15,756,000 |
DSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Minimum percentage of annual board retainer in the form of share-based payment arrangement | 50.00% |  |
Number of other equity instruments outstanding (in shares) | shares | 292,873 | 255,472 | 226,000
Other equity instruments outstanding amount | $ 9,500,000 | $ 6,500,000 |
Fair value per unit outstanding (in dollars per share) | 32.30 | 25.37 |
Compensation expense included in selling, general and administrative expenses | $ 1,100,000 | $ 700,000 |

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- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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