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SHAREHOLDERS' EQUITY - Dividends (Details) - $ / shares |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 27, 2021 | Jan. 04, 2021 | Oct. 01, 2020 | Jul. 02, 2020 | Apr. 01, 2020 | Jan. 02, 2020 | Oct. 01, 2019 | Jul. 02, 2019 | Apr. 01, 2019 | Jan. 04, 2021 | Jan. 02, 2020 | Dec. 31, 2020
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 | $ 0.50 |  | $ 2.00 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) |  | $ 0.50 |  |  |  |  |  |  |  | $ 2.00 |  |
Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Dividends per share (in dollars per share) | $ 0.50 |  |  |  |  |  |  |  |  |  |  |
Class A Voting Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Entitled rate per share of dividends (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.05
Class B Non-Voting Shares |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Entitled rate per share of dividends (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 0.05

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