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Net sales by product - Segment information (Details) - BRL (R$) R$ in Thousands | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Disclosure of operating segments [line items] |  |
Net sales | R$ 11,552,921 | R$ 9,458,602
Total of products |  |
Disclosure of operating segments [line items] |  |
Net sales | 11,552,921 | 9,458,602
Market pulp (1) |  |
Disclosure of operating segments [line items] |  |
Net sales | 8,611,543 | 7,359,846
Printing and writing paper (2) |  |
Disclosure of operating segments [line items] |  |
Net sales | 1,879,301 | 1,780,944
Paperboard |  |
Disclosure of operating segments [line items] |  |
Net sales | 1,051,768 | 298,190
Other |  |
Disclosure of operating segments [line items] |  |
Net sales | R$ 10,309 | R$ 19,622
Fluff pulp |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 0.60% | 0.70%
Tissue |  |
Disclosure of operating segments [line items] |  |
Percentage of entity's revenue | 6.00% | 6.70%

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