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BIOLOGICAL ASSETS - Assumptions (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2021 ha m / ha R$ / m³	Dec. 31, 2020 ha R$ / m³ m / ha
Assumptions used
Planted useful area (hectare)	954,008	1,020,176
Average annual growth (IMA) - m3/hectare /year | m / ha	38.55	38.43
Average gross sale price of eucalyptus - R$/m3 | R$ / m³	72.61	70.22
Discount rate - %	8.90%	8.90%
Mature assets
Assumptions used
Planted useful area (hectare)	102,941	111,866
Immature assets
Assumptions used
Planted useful area (hectare)	851,067	908,310

X

- Definition

The area of land used for agriculture by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

+ References

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- Definition

The discount rate used in the current measurement of fair value less costs of disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
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- Definition

Average annual growth per hectare (in m3/hectares) used for calculation of fair value of biological assets.

+ References

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- Definition

Average gross sale price used for calculation of fair value of biological assets.

+ References

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