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Biological assets - Measurement of the premises adopted (Details)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
BRL (R$)
ha
cubicMeterPerHectare
R$ / m³
Jun. 30, 2023
BRL (R$)
Dec. 31, 2023
BRL (R$)
ha
R$ / m³
meterPerHectare
Disclosure of detailed information about biological assets [line items]      
Planted useful area (hectare) 1,150,075,000   1,094,611,000
Average annual growth (IMA) – m3/hectare/year 39,110   37,920
Average gross sale price of eucalyptus – R$/m3 | R$ / m³ 103,410   96,040.00
Discount rate (post-tax) 8.60%   8.80%
Total | R$ R$ (539,003) R$ (1,256,315) R$ (1,989,831)
Mature assets      
Disclosure of detailed information about biological assets [line items]      
Planted useful area (hectare) 172,457,000   144,942,000
Immature assets      
Disclosure of detailed information about biological assets [line items]      
Planted useful area (hectare) 977,618,000   949,669,000