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Information of operating segments - Segment information (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Disclosure of operating segments [line items]        
Net sales R$ 13,295,895 R$ 11,494,136 R$ 24,848,816 R$ 20,952,738
Cost of sales (8,608,124) (6,093,239) (16,337,291) (11,793,109)
Adjusted EBITDA     10,953,192 10,845,773
Adjustments to EBITDA     (482,327) 430,879
Depreciation, depletion and amortization     (5,336,686) (4,110,780)
Financial result     12,121,178 (14,113,723)
Net income before taxes 2,875,144 4,613,646 5,134,179 7,165,872
Profit (loss) before tax R$ 7,300,109 R$ (6,460,029) 17,255,357 (6,947,851)
Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     24,848,816 20,952,738
Country of domicile        
Disclosure of operating segments [line items]        
Net sales     4,422,656 4,361,918
Foreign countries        
Disclosure of operating segments [line items]        
Net sales     20,426,160 16,590,820
Pulp        
Disclosure of operating segments [line items]        
Cost of sales     (12,240,678) (9,100,750)
Adjusted EBITDA     9,632,109 9,439,622
Pulp | Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     18,899,505 16,594,855
Pulp | Country of domicile        
Disclosure of operating segments [line items]        
Net sales     934,903 1,049,948
Pulp | Foreign countries        
Disclosure of operating segments [line items]        
Net sales     17,964,602 15,544,907
Paper        
Disclosure of operating segments [line items]        
Cost of sales     (4,096,613) (2,692,359)
Adjusted EBITDA     1,321,083 1,406,151
Paper | Total Net Sales        
Disclosure of operating segments [line items]        
Net sales     5,949,311 4,357,883
Paper | Country of domicile        
Disclosure of operating segments [line items]        
Net sales     3,487,753 3,311,970
Paper | Foreign countries        
Disclosure of operating segments [line items]        
Net sales     R$ 2,461,558 R$ 1,045,913