Recoverable taxes - Summary (Details) - BRL (R$) R$ in Thousands |
Sep. 30, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Disclosure of Tax Receivables and Payables [Line Items] | |||
| IRPJ/CSLL – prepayments and withheld taxes | R$ 572,825 | R$ 227,464 | |
| PIS/COFINS – on acquisitions of property, plant and equipment (1) | 76,007 | 187,126 | |
| PIS/COFINS – operations | 707,848 | 789,667 | |
| PIS/COFINS – exclusions from ICMS (2) | 343,981 | 405,407 | |
| ICMS – on acquisitions of property, plant and equipment (3) | 469,771 | 471,825 | |
| ICMS – operations (4) | 1,807,873 | 1,654,162 | |
| Reintegra program (5) | 75,234 | 70,610 | |
| Other taxes and contributions | 133,407 | 64,444 | |
| Provision for loss on ICMS credits (6) | (1,733,630) | (1,581,961) | R$ (1,452,435) |
| Tax Assets | 2,453,316 | 2,288,744 | |
| Recoverable taxes | 1,488,160 | 1,109,619 | |
| Recoverable taxes | R$ 965,156 | R$ 1,179,125 |