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Investments - Investments in Associates and Joint Ventures (Details) R$ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 BRL (R$) | Mar. 31, 2025 BRL (R$) € / shares | Mar. 31, 2024 BRL (R$) | Mar. 31, 2024 BRL (R$) € / shares | Dec. 31, 2024 BRL (R$) | Dec. 31, 2023 BRL (R$)
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | R$ 38,535,646 | R$ 38,535,646 | R$ 44,724,599 | R$ 44,724,599 | R$ 32,415,575 | R$ 44,810,300
Income (expenses) of the period | R$ 6,348,178 |  | 220,032 |  |  |
% | 100.00% |  |  |  | 100.00% |
In the income (expenses) for the period | R$ (17,077) |  | (9,907) |  |  |
Non-current financial assets at fair value through other comprehensive income | 1,427,438 | 1,427,438 |  |  | R$ 1,591,437 |
Associate | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Carrying amount | 111,247 | 111,247 |  |  | 125,316 |
In the income (expenses) for the period | R$ (12,252) |  | (10,473) |  |  |
Ensyn Corporation | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 24.80% |  |  |  |  |
Carrying amount | R$ (232) | (232) |  |  | 2 |
In the income (expenses) for the period | R$ (3,091) |  | (1,408) |  |  |
Spinnova Plc | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 18.76% |  |  |  |  |
Carrying amount | R$ 82,768 | 82,768 |  |  | 95,254 |
In the income (expenses) for the period | (9,161) |  | (9,065) |  |  |
Joint ventures |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Carrying amount | 309,371 | 309,371 |  |  | 328,055 |
In the income (expenses) for the period | R$ (4,825) |  | 566 |  |  |
Biomas | Domestic (Brazil) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 16.66% |  |  |  |  |
Carrying amount | R$ 1,473 | 1,473 |  |  | 2,923 |
In the income (expenses) for the period | R$ (1,449) |  | (1,142) |  |  |
Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 49.90% |  |  |  |  |
Carrying amount | R$ 188,618 | 188,618 |  |  | 193,901 |
In the income (expenses) for the period | R$ 3,551 |  | 7,461 |  |  |
F&E Technologies LLC | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 50.00% |  |  |  |  |
Carrying amount | R$ 5,914 | 5,914 |  |  | 6,378 |
In the income (expenses) for the period |  |  |  |  |  |
Woodspin Oy | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 50.00% |  |  |  |  |
Carrying amount | R$ 113,366 | 113,366 |  |  | 124,853 |
In the income (expenses) for the period | (6,927) |  | (5,753) |  |  |
Total other investments evaluated at fair value |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
In the income (expenses) for the period |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | R$ 1,006,820 | 1,006,820 |  |  | 1,138,066 |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
% | 5.82% |  |  |  |  |
Bem Agro Integração e Desenvolvimento S.A. (Indirect) | Domestic (Brazil) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | R$ 3,737 | 3,737 |  |  | 4,026 |
Celluforce Inc. (Direct) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
% | 8.28% |  |  |  |  |
Celluforce Inc. (Direct) | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | R$ 25,813 | 25,813 |  |  | 27,823 |
Nfinite Nanotechnology Inc. (Indirect) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
% | 5.00% |  |  |  |  |
Nfinite Nanotechnology Inc. (Indirect) | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | R$ 5,886 | 5,886 |  |  | 6,347 |
Lenzing Aktiengesellschaft (Indirect) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
% | 15.00% |  |  |  |  |
Lenzing Aktiengesellschaft (Indirect) | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Non-current financial assets at fair value through other comprehensive income | R$ 971,384 | 971,384 |  |  | 1,099,870 |
Simplifyber, Inc (Indirect) | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Participation equity (%) | 14.20% |  |  |  |  |
Carrying amount | R$ 28,711 | 28,711 |  |  | R$ 30,060 |
In the income (expenses) for the period |  |  |  |  |  |
Ensyn Corporation |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | (936) | (936) |  |  |  |
Income (expenses) of the period | (7,046) |  |  |  |  |
Spinnova Plc |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | 441,192 | R$ 441,192 |  |  |  |
Income (expenses) of the period | (49,051) |  |  |  |  |
NASDAQ, Nordic Growth Market, Average Share Price | € / shares |  | R$ 0.52 |  | R$ 0.95 |  |
Biomas | Domestic (Brazil) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | 8,839 | R$ 8,839 |  |  |  |
Income (expenses) of the period | (8,697) |  |  |  |  |
Ibema Companhia Brasileira de Papel | Domestic (Brazil) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | 377,992 | 377,992 |  |  |  |
Income (expenses) of the period | 7,117 |  |  |  |  |
F&E Technologies LLC | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | 11,829 | 11,829 |  |  |  |
Income (expenses) of the period |  |  |  |  |  |
Woodspin Oy | Foreign |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity | 226,731 | 226,731 |  |  |  |
Income (expenses) of the period | (13,855) |  |  |  |  |
Simplifyber, Inc (Indirect) |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Equity |  |  |  |  |  |
Income (expenses) of the period |  |  |  |  |  |

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