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Net sales by product - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disclosure of operating segments [line items]        
Net sales R$ 12,153,145 R$ 12,273,546 R$ 37,001,961 R$ 33,226,284
Total of products        
Disclosure of operating segments [line items]        
Net sales     37,001,961 33,226,284
Market pulp (1)        
Disclosure of operating segments [line items]        
Net sales     27,949,498 26,397,840
Printing and writing paper (2)        
Disclosure of operating segments [line items]        
Net sales     5,985,698 5,846,679
Paperboard        
Disclosure of operating segments [line items]        
Net sales     3,036,987 933,513
Other        
Disclosure of operating segments [line items]        
Net sales     R$ 29,778 R$ 48,252
Fluff pulp        
Disclosure of operating segments [line items]        
Percentage of entity's revenue     0.70% 0.70%
Tissue        
Disclosure of operating segments [line items]        
Percentage of entity's revenue     5.70% 6.10%