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SHAREHOLDERS' EQUITY - Capital reserve (Details) - BRL (R$) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2019
Other |  |  |
Share Capital |  |  |
Stock options granted | R$ (6,410,885) |  |
Other | Fibria |  |  |
Share Capital |  |  |
Issuance of shares related to a business combination |  |  | R$ 6,410,885
Stock options granted |  |  |
Share Capital |  |  |
Capital reserves arising from stock options | R$ 10,612 |  |
Stock options granted |  | R$ (14,307) |
Capital reserve as a percentage of share capital | 0.11% |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References No definition available. + Details
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