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SHAREHOLDERS' EQUITY - Dividends (Details) - CAD / shares |  |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2018 | Jan. 02, 2018 | Oct. 03, 2017 | Jul. 04, 2017 | Apr. 03, 2017 | Jan. 03, 2017 | Oct. 03, 2016 | Jul. 04, 2016 | Apr. 01, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  | CAD 0.48 | CAD 0.48 | CAD 0.48 | CAD 0.48 | CAD 0.48 | CAD 0.48 | CAD 0.48 | CAD 1.92 | CAD 1.92
Entitled rate per share of dividends (in dollars per share) |  |  |  |  |  |  |  |  |  | CAD 0.05 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) | CAD 0.48 | CAD 0.48 |  |  |  |  |  |  |  |  |

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