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Biological assets - Assumptions (Details)
12 Months Ended
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