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Financial instruments and risk management (Details 14) - BRL (R$)
R$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss R$ 464,368 R$ 433,878
Financial liabilities at fair value through profit or loss 3,940,624 (613,092)
Financial assets and liabilities 3,952,727 (601,340)
Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets and liabilities 3,257,017 2,957,280
Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets and liabilities 695,710 (3,558,620)
Stocks [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets measured at fair value through other comprehensive income 12,103 11,752
Stocks [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets measured at fair value through other comprehensive income 12,103 11,752
Stocks [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets measured at fair value through other comprehensive income
Savings Account And Overnight [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 17,570 12,720
Savings Account And Overnight [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 17,570 12,720
Savings Account And Overnight [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Term Deposits [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 2,758,300 2,495,438
Term Deposits [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 2,758,300 2,495,438
Term Deposits [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Bank deposit certificates [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 4,876,861 3,754,202
Bank deposit certificates [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Bank deposit certificates [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 4,876,861 3,754,202
Financial Treasury Bills [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 412,107 364,543
Financial Treasury Bills [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 412,107 364,543
Financial Treasury Bills [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Investment funds [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 21,186 19,018
Investment funds [member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 21,186 19,018
Investment funds [member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Trade Accounts Receivable 1 [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 337,898 274,493
Trade Accounts Receivable 1 [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Trade Accounts Receivable 1 [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 337,898 274,493
Derivatives [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 639,052 131,148
Financial liabilities at fair value through profit or loss (136,759) (257,167)
Derivatives [member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Financial liabilities at fair value through profit or loss
Derivatives [member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 639,052 131,148
Financial liabilities at fair value through profit or loss (136,759) (257,167)
Other Titles [Member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 35,751 53,809
Other Titles [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss 35,751 53,809
Other Titles [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial assets at fair value through profit or loss
Loans and Borrowings [Member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss (5,021,342) (7,461,296)
Loans and Borrowings [Member] | Level 1 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss
Loans and Borrowings [Member] | Level 2 of fair value hierarchy [member]    
IfrsStatementLineItems [Line Items]    
Financial liabilities at fair value through profit or loss R$ (5,021,342) R$ (7,461,296)