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Financial instruments and risk management (Details 7) - Cash flow hedges [member] - Currency risk [member]
R$ in Thousands
12 Months Ended
Dec. 31, 2023
BRL (R$)
Number
IfrsStatementLineItems [Line Items]  
Notional R$ 574,500
Fair value R$ 95,958
Non-deliverable forward [member]  
IfrsStatementLineItems [Line Items]  
Hedged object USD Exports 
Asset BRL
Liabilities USD
Maturity 1st Qtr. 2024
Notional R$ 128,500
Designation rate | Number 5.2959
Fair value R$ 52,159
Nondeliverable Forward One [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object USD Exports
Asset BRL
Liabilities USD
Maturity 2nd Qtr. 2024
Notional R$ 65,500
Designation rate | Number 5.1633
Fair value R$ 14,564
Nondeliverable Forward Two [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object USD Exports
Asset BRL
Liabilities USD
Maturity 3rd Qtr. 2024
Notional R$ 45,500
Designation rate | Number 5.2487
Fair value R$ 11,528
Collar [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object USD Exports
Asset BRL
Liabilities USD
Maturity 1st Qtr. 2024
Notional R$ 295,000
Designation rate | Number 5.0122
Fair value R$ 15,693
Collar One [Member]  
IfrsStatementLineItems [Line Items]  
Hedged object USD Exports 
Asset BRL
Liabilities USD
Maturity 2nd Qtr. 2024
Notional R$ 40,000
Designation rate | Number 5.0151
Fair value R$ 2,014