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Biological assets - Assumptions (Details) | 12 Months Ended
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Dec. 31, 2018 ha R$ / m³ m / ha | Dec. 31, 2017 ha R$ / m³ m / ha | Dec. 31, 2016 ha R$ / m³ m / ha
Assumptions used |  |  |
Planted useful area (hectare) | 463,801 | 466,535 | 450,474
Average annual growth (IMA) - m/hectare | m / ha | 29.93 | 28.89 | 33.80
Average gross sale price of eucalyptus - R$/m3 | R$ / m³ | 68.62 | 69.19 | 53.45
Utilization cost of Company's assets that contribute - % | 4.50% | 4.44% | 5.00%
Discount rate - % | 9.36% | 9.11% | 10.54%
Mature assets |  |  |
Assumptions used |  |  |
Planted useful area (hectare) | 68,207 | 73,897 | 84,084
Immature assets |  |  |
Assumptions used |  |  |
Planted useful area (hectare) | 395,594 | 392,638 | 366,390

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- Definition The area of land used for agriculture by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 41 -IssueDate 2018-01-01 -Paragraph 46 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=41&date=2018-03-01&anchor=para_46_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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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 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 -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph f -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_f_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Average annual growth per hectare (in m3/hectares) used for calculation of fair value of biological assets. + References No definition available. + Details
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- Definition Average gross sale price used for calculation of fair value of biological assets. + References No definition available. + Details
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- Definition Percentage of contribution of utilization cost of assets. + References No definition available. + Details
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- Details
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- Details
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