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Advances to suppliers (Details) - BRL (R$)
R$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Advances to Suppliers [Line Items]    
Current R$ 87,696 R$ 92,133
Non-current 2,682,250 2,503,537
Total    
Advances to Suppliers [Line Items]    
Advances to Suppliers. 2,769,946 2,595,670
Forestry development program and partnerships    
Advances to Suppliers [Line Items]    
Advances to Suppliers. 2,682,250 2,503,537
Advance to suppliers - others    
Advances to Suppliers [Line Items]    
Advances to Suppliers. R$ 87,696 R$ 92,133