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SHARE-BASED COMPENSATION (Outstanding stock options) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 CAD shares | Jan. 01, 2017 USD ($) shares | Jan. 01, 2017 CAD shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, end of fiscal period (in shares) | 3,022,000 | 3,022,000 |  |
CAD |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, beginning of fiscal period (in shares) | 2,532,000 | 2,532,000 | 1,895,000 | 1,895,000
Granted (in shares) |  |  | 714,000 | 714,000
Exercised (in shares) | (269,000) | (269,000) | (77,000) | (77,000)
Number, outstanding, end of fiscal period (in shares) | 2,263,000 | 2,263,000 | 2,532,000 | 2,532,000
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | CAD |  | CAD 31.18 |  | CAD 29.78
Granted (in CAD per share) | CAD |  |  |  | 33.01
Exercised (in CAD per share) | CAD |  | 16.43 |  | 13.76
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | CAD |  | CAD 32.94 |  | CAD 31.18
USD |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Number, outstanding, beginning of fiscal period (in shares) | 0 | 0 |  |
Granted (in shares) | 759,000 | 759,000 |  |
Number, outstanding, end of fiscal period (in shares) | 759,000 | 759,000 | 0 | 0
Weighted exercise price, outstanding, beginning of fiscal period (in CAD per share) | $ | $ 0.00 |  |  |
Granted (in CAD per share) | $ | 29.01 |  |  |
Weighted exercise price, outstanding, end of fiscal period (in CAD per share) | $ | $ 29.01 |  | $ 0.00 |

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