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Net sales by product - Segment information (Details) - BRL (R$) R$ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disclosure of operating segments [line items] |  |  |  |
NET SALES | R$ 11,494,136 | R$ 9,159,634 | R$ 20,952,738 | R$ 20,436,017
Total of products |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
NET SALES |  |  | 20,952,738 | 20,436,017
Market pulp (1) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
NET SALES |  |  | 16,594,855 | 16,302,347
Printing and writing paper (2) |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
NET SALES |  |  | 3,738,388 | 3,384,698
Paperboard |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
NET SALES |  |  | 586,651 | 708,576
Other |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
NET SALES |  |  | R$ 32,844 | R$ 40,396
Fluff pulp |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 0.70% | 0.80%
Tissue |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Percentage of entity's revenue |  |  | 6.30% | 3.10%

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