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Biological assets - Fair value adjustment (Details) - BRL (R$)
R$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Gains (losses) on fair value adjustment, biological assets [abstract]      
Fair value adjustment of biological assets R$ (73,248) R$ 539,003 R$ 1,431,530