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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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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.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

The increase (decrease) in equity resulting from transfers between treasury shares and Stock options granted.

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- Definition

Represents the reserve as a percentage of share capital.

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