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v3.25.3

Financial instruments - Fair value settled amounts (Details) - BRL (R$) R$ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2025 | Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | R$ 370,789 | R$ (550,581)
Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (8,901) | 650,845
Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 6,303 | 89,327
Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 373,387 | (1,290,753)
Zero cost collar (R$ x U.S.$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 6,513 | 645,759
NDF (R$ x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (15,388) | (68,695)
NDF (CNY x US$) | Operational Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (26) | 73,781
Swap VLSFO/other | Commodity Hedge |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 6,303 | 89,327
Swap CDI x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 265,568 | (1,635,058)
Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | (200,007) | (59,243)
Swap Pre-Fixed to US$ | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement |  | (221,462)
Swap SOFR x SOFR (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 1,504 | 2,199
Swap SOFR x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | 120,515 | 19,074
Swap SOFR x Fixed (US$) | Debt hedges |  |
Disclosure of detailed information about financial instruments [line items] |  |
Proceeds From (Payments For) Derivative Instrument, Settlement | R$ 185,807 | R$ 603,737

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