v3.26.1
Information of operating segments - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Disclosure of operating segments [line items]    
Net sales R$ 10,968,416 R$ 11,552,921
Cost of sales (7,807,576) (7,729,167)
Adjusted EBITDA   4,865,774
Adjustments to EBITDA (1,643) 109,317
Depreciation, depletion and amortization 2,806,652 2,497,422
Financial result 4,616,436 7,696,213
Net income before taxes 6,391,572 9,955,248
Gross profit 3,160,840 3,823,754
Profit (loss) from operating activities 1,775,136 2,259,035
Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 10,968,416 11,552,921
Country of domicile    
Disclosure of operating segments [line items]    
Net sales 2,071,747 2,148,612
Foreign countries    
Disclosure of operating segments [line items]    
Net sales 8,896,669 9,404,309
Pulp    
Disclosure of operating segments [line items]    
Cost of sales (5,938,620) (5,696,157)
Adjusted EBITDA   4,254,146
Pulp | Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 8,345,742 8,611,543
Pulp | Country of domicile    
Disclosure of operating segments [line items]    
Net sales 405,693 457,416
Pulp | Foreign countries    
Disclosure of operating segments [line items]    
Net sales 7,940,049 8,154,127
Paper    
Disclosure of operating segments [line items]    
Cost of sales (1,868,956) (2,033,010)
Adjusted EBITDA   611,628
Paper | Total Net Sales    
Disclosure of operating segments [line items]    
Net sales 2,622,674 2,941,378
Paper | Country of domicile    
Disclosure of operating segments [line items]    
Net sales 1,666,054 1,691,196
Paper | Foreign countries    
Disclosure of operating segments [line items]    
Net sales R$ 956,620 R$ 1,250,182