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Net sales by product - Segment information (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disclosure of operating segments [line items] |  |  |  |
Net sales | R$ 12,153,145 | R$ 12,273,546 | R$ 37,001,961 | R$ 33,226,284
Total of products |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 37,001,961 | 33,226,284
Market pulp (1) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 27,949,498 | 26,397,840
Printing and writing paper (2) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 5,985,698 | 5,846,679
Paperboard |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | 3,036,987 | 933,513
Other |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Net sales |  |  | R$ 29,778 | R$ 48,252
Fluff pulp |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 0.70% | 0.70%
Tissue |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 5.70% | 6.10%

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