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Biological assets - Changes (Details) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in balances of biological assets
Balance, beginning of the year	R$ 4,548,897	R$ 4,072,528
Additions	1,285,490	912,368
Depletion for the year	(709,547)	(551,135)
Gain (Loss) on adjustment to fair value	(129,187)	192,504	R$ (780,666)
Disposal of forests	(47,124)	(28,030)
Other write-offs	(12,624)	(49,338)
Balance, end of the year	R$ 4,935,905	4,548,897	R$ 4,072,528
Average cycle of forest formation	7 years
Forests
Changes in balances of biological assets
Additions	R$ 433,334	136,414
Formation of Biological Assets	R$ 852,156	R$ 775,954

X

- Definition

The amount of additions to biological assets resulting from purchases. [Refer: Biological assets]

+ References

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- Definition

The decrease in biological assets due to the detachment of produce from the assets or the cessation of the assets' life processes. [Refer: Biological assets]

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The decrease in biological assets resulting from disposals. [Refer: Biological assets]

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- Definition

The gains (losses) arising from changes in fair value less costs to sell of biological assets due to both physical and price changes in the market. [Refer: Biological assets]

+ References

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The increase (decrease) in biological assets resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Biological assets]

+ References

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The amount of non-current biological assets. [Refer: Biological assets]

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- Definition

The period of harvest cycle with productivity and area of plantation for determining the fair value of biological assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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Represents information pertaining to Formation of Biological Assets.

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