v3.26.1
Information of operating segments - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of operating segments [line items]        
Net sales R$ 11,590,133 R$ 13,295,895 R$ 22,558,549 R$ 24,848,816
Cost of sales (8,761,465) (8,608,124) (16,569,041) (16,337,291)
Adjusted EBITDA     9,284,751 10,953,192
Adjustments to EBITDA     (1,218,270) 482,327
Depreciation, depletion and amortization     5,939,254 5,336,686
Financial result     4,606,016 12,121,178
Net income before taxes 2,778,211 7,300,109 9,169,783 17,255,357
Gross profit 2,828,668 4,687,771 5,989,508 8,511,525
Profit (loss) from operating activities R$ 2,788,631 R$ 2,875,144 4,563,767 5,134,179
Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     22,558,549 24,848,816
Country of domicile        
Disclosure of operating segments [line items]        
Net sales     4,372,844 4,422,656
Foreign countries        
Disclosure of operating segments [line items]        
Net sales     18,185,705 20,426,160
Pulp        
Disclosure of operating segments [line items]        
Cost of sales     (12,568,020) (12,240,678)
Adjusted EBITDA     8,240,312 9,632,109
Pulp | Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     17,101,601 18,899,505
Pulp | Country of domicile        
Disclosure of operating segments [line items]        
Net sales     855,842 934,903
Pulp | Foreign countries        
Disclosure of operating segments [line items]        
Net sales     16,245,759 17,964,602
Paper        
Disclosure of operating segments [line items]        
Cost of sales     (4,001,021) (4,096,613)
Adjusted EBITDA     1,044,439 1,321,083
Paper | Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     5,456,948 5,949,311
Paper | Country of domicile        
Disclosure of operating segments [line items]        
Net sales     3,517,002 3,487,753
Paper | Foreign countries        
Disclosure of operating segments [line items]        
Net sales     R$ 1,939,946 R$ 2,461,558