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Financial instruments - Outstanding assets and liabilities derivatives positions (Details) - BRL (R$)
R$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]    
Fair value R$ (1,847,708) R$ 1,994,382
Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Fair value (589,915) (486,713)
Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Fair value (1,401,797) 2,231,475
Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Fair value 144,004 249,620
Zero cost collar (U.S.$ x R$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 6,547,200 4,500,200
Fair value (1,333,266) 1,968,337
Zero cost collar (U.S.$ x R$) | Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 121,865 163,100
Fair value 30,535 (3,148)
NDF (R$ x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 357,500 505,000
Fair value (77,902) 162,776
NDF (€ x US$) | Operational Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 68,512 262,088
Fair value 9,371 100,362
Swap US-CPI standing wood | Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 139,342 131,510
Fair value 66,945 230,471
Swap VLSFO/Brent | Commodity Hedge    
Disclosure of detailed information about financial instruments [line items]    
Notional value 76,684 142,794
Fair value 46,524 22,297
Derivative Assets | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Fair value 3,044,266 1,529,543
Derivative Assets | Swap CDI x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 4,748,394 3,898,011
Fair value 1,618,434 223,776
Derivative Assets | Swap Pre-Fixed to US$ | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 738,800
Fair value
Derivative Assets | Swap SOFR to Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 1,437,593 2,555,626
Fair value 430,489 1,104,984
Derivative Assets | Swap IPCA to CDI (notional in Brazilian Reais) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 5,229,379 4,320,471
Fair value 308,989 161,542
Derivative Assets | Swap CDI x SOFR (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 3,117,625 644,850
Fair value 679,637 32,560
Derivative Assets | Swap SOFR to SOFR (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 150,961 150,961
Fair value 6,717 6,681
Derivative Liabilities | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Fair value (3,634,181) (2,016,256)
Derivative Liabilities | Swap CDI x Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 909,612 1,025,000
Fair value (1,936,790) (1,305,740)
Derivative Liabilities | Swap Pre-Fixed to US$ | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 200,000
Fair value (203,045)
Derivative Liabilities | Swap SOFR to Fixed (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 1,437,593 2,555,626
Fair value (38,577) (363,492)
Derivative Liabilities | Swap IPCA to CDI (notional in Brazilian Reais) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 5,078,782 4,274,397
Fair value (673,422) (113,897)
Derivative Liabilities | Swap CDI x SOFR (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 610,171 125,000
Fair value (956,752) (6,786)
Derivative Liabilities | Swap SOFR to SOFR (US$) | Debt hedges    
Disclosure of detailed information about financial instruments [line items]    
Notional value 150,961 150,961
Fair value R$ (28,640) R$ (23,296)