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Net sales by product - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Disclosure of operating segments [line items]        
NET SALES R$ 11,494,136 R$ 9,159,634 R$ 20,952,738 R$ 20,436,017
Total of products        
Disclosure of operating segments [line items]        
NET SALES     20,952,738 20,436,017
Market pulp (1)        
Disclosure of operating segments [line items]        
NET SALES     16,594,855 16,302,347
Printing and writing paper (2)        
Disclosure of operating segments [line items]        
NET SALES     3,738,388 3,384,698
Paperboard        
Disclosure of operating segments [line items]        
NET SALES     586,651 708,576
Other        
Disclosure of operating segments [line items]        
NET SALES     R$ 32,844 R$ 40,396
Fluff pulp        
Disclosure of operating segments [line items]        
Percentage of entity's revenue     0.70% 0.80%
Tissue        
Disclosure of operating segments [line items]        
Percentage of entity's revenue     6.30% 3.10%