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Financial instruments - Sensitivity analysis to changes in the consumer price indices of the US economy (Details)
R$ in Thousands
Sep. 30, 2025
BRL (R$)
Possible 25%  
Disclosure of detailed information about financial instruments [line items]  
Sensitivity Analysis, Percentage Change of Scenario 25.00%
Remote 50%  
Disclosure of detailed information about financial instruments [line items]  
Sensitivity Analysis, Percentage Change of Scenario 50.00%
Commodity price risk [member] | Possible 25%  
Disclosure of detailed information about financial instruments [line items]  
Embedded derivative in a commitment to purchase standing wood, originating from a forest partnership agreement R$ (24,312)
Commodity price risk [member] | Remote 50%  
Disclosure of detailed information about financial instruments [line items]  
Embedded derivative in a commitment to purchase standing wood, originating from a forest partnership agreement (51,222)
Commodity price risk [member] | Probable (base value)  
Disclosure of detailed information about financial instruments [line items]  
Embedded derivative in a commitment to purchase standing wood, originating from a forest partnership agreement R$ 99,383