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SHARE-BASED COMPENSATION (Outstanding stock options) (Details) | 12 Months Ended
--- | ---
Dec. 30, 2018 USD ($) shares | Dec. 30, 2018 CAD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CAD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, end of fiscal period (in shares) | 2,662,000 | 2,662,000 |  |
CAD |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, beginning of fiscal period (in shares) | 2,263,000 | 2,263,000 | 2,532,000 | 2,532,000
Exercised (in shares) | (110,000) | (110,000) | (269,000) | (269,000)
Forfeited (in shares) | (160,000) | (160,000) |  |
Number, outstanding, end of fiscal period (in shares) | 1,993,000 | 1,993,000 | 2,263,000 | 2,263,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | $ |  | $ 32.94 |  | $ 31.18
Exercised (in CAD per share) | $ |  | 19.98 |  | 16.43
Forfeited (in CAD per share) | $ | $ 33.58 |  |  |
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $ |  | $ 33.60 |  | $ 32.94
USD |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, beginning of fiscal period (in shares) | 759,000 | 759,000 | 0 | 0
Granted (in shares) | 0 | 0 | 759,000 | 759,000
Forfeited (in shares) | (90,000) | (90,000) |  |
Number, outstanding, end of fiscal period (in shares) | 669,000 | 669,000 | 759,000 | 759,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | $ 29.01 |  |  | $ 0.00
Granted (in CAD per share) | $ |  |  | $ 29.01 |
Forfeited (in CAD per share) | $ | 29.01 |  |  |
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $ | $ 29.01 |  | $ 29.01 |

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