v3.25.1
Financial instruments - Fair value settled amounts (Details) - BRL (R$)
R$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement R$ 124,558 R$ (550,581)
Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (28,667) 650,845
Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 8,733 89,327
Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 144,492 (1,290,753)
Zero cost collar (R$ x U.S.$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 1,475 645,759
NDF (R$ x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (30,142) (68,695)
NDF (€ x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 73,781
Swap VLSFO/other | Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 8,733 89,327
Swap CDI x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement 90,068 (1,635,058)
Swap IPCA x CDI (notional in Brazilian Reais) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement (43,312) (59,243)
Swap Pre-Fixed to US$ | 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 21,482 19,074
Swap SOFR x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Proceeds From (Payments For) Derivative Instrument, Settlement R$ 74,750 R$ 603,737