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Biological assets - Changes (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
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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 |

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- Definition The amount of additions to biological assets resulting from purchases. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50_b&doctype=Standard -URIDate 2018-03-16 + Details
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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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50_d&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in biological assets resulting from disposals. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50_c&doctype=Standard -URIDate 2018-03-16 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 50 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_50_g&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of non-current biological assets. [Refer: Biological assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_f&doctype=Standard -URIDate 2018-03-16 + Details
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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. + References No definition available. + Details
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- Definition Represents information pertaining to Formation of Biological Assets. + References No definition available. + Details
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