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Information of operating segments - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Disclosure of operating segments [line items]    
Net sales R$ 11,552,921 R$ 9,458,602
Cost of sales (7,729,167) (5,699,870)
Adjusted EBITDA 4,865,774 4,557,906
Adjustments to EBITDA (109,317) (23,656)
Depreciation, depletion and amortization (2,497,422) (1,982,024)
Financial result 7,696,213 (3,040,048)
Net income before taxes 2,259,035 2,552,226
Profit (loss) before tax 9,955,248 (487,822)
Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 11,552,921 9,458,602
Country of domicile    
Disclosure of operating segments [line items]    
Net sales 2,148,612 2,058,658
Foreign countries    
Disclosure of operating segments [line items]    
Net sales 9,404,309 7,399,944
Pulp    
Disclosure of operating segments [line items]    
Cost of sales (5,696,157) (4,374,903)
Adjusted EBITDA 4,254,146 3,902,250
Pulp | Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 8,611,543 7,359,846
Pulp | Country of domicile    
Disclosure of operating segments [line items]    
Net sales 457,416 486,168
Pulp | Foreign countries    
Disclosure of operating segments [line items]    
Net sales 8,154,127 6,873,678
Paper    
Disclosure of operating segments [line items]    
Cost of sales (2,033,010) (1,324,967)
Adjusted EBITDA 611,628 655,656
Paper | Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 2,941,378 2,098,756
Paper | Country of domicile    
Disclosure of operating segments [line items]    
Net sales 1,691,196 1,572,490
Paper | Foreign countries    
Disclosure of operating segments [line items]    
Net sales R$ 1,250,182 R$ 526,266