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Employees benefits (Details 9)
R$ in Thousands
Dec. 31, 2023
BRL (R$)
Actuarial assumption of discount rates [member] | Medical Plan [Member]  
IfrsStatementLineItems [Line Items]  
Assumptions utilized 9.61%
(+) Variation, Average (%) 10.61%
(+) Variation, Actuarial liabilities R$ 56,322
(-) Variation, Average (%) 8.61%
(-) Variation, Actuarial liabilities R$ 78,929
Actuarial assumption of discount rates [member] | Award For Length Of Service [Member]  
IfrsStatementLineItems [Line Items]  
Assumptions utilized 9.42%
(+) Variation, Average (%) 10.42%
(+) Variation, Actuarial liabilities R$ 120,327
(-) Variation, Average (%) 8.42%
(-) Variation, Actuarial liabilities R$ 132,249
Actuarial assumption of discount rates [member] | F G T S Penalty [Member]  
IfrsStatementLineItems [Line Items]  
Assumptions utilized 9.42%
(+) Variation, Average (%) 10.42%
(+) Variation, Actuarial liabilities R$ 67,125
(-) Variation, Average (%) 8.42%
(-) Variation, Actuarial liabilities R$ 74,375
Actuarial assumption of expected rates of inflation [member] | Medical Plan [Member]  
IfrsStatementLineItems [Line Items]  
Assumptions utilized 6.60%
(+) Variation, Average (%) 7.60%
(+) Variation, Actuarial liabilities R$ 78,902
(-) Variation, Average (%) 5.60%
(-) Variation, Actuarial liabilities R$ 56,260
Actuarial Assumption Of Expected Rates Turnover [Member] | Award For Length Of Service [Member]  
IfrsStatementLineItems [Line Items]  
(+) Variation, Average (%) 3.00%
(+) Variation, Actuarial liabilities R$ 107,233
(-) Variation, Average (%) 3.00%
(-) Variation, Actuarial liabilities R$ 151,251
Actuarial Assumption Of Expected Rates Turnover [Member] | F G T S Penalty [Member]  
IfrsStatementLineItems [Line Items]  
(+) Variation, Average (%) 3.00%
(+) Variation, Actuarial liabilities R$ 59,720
(-) Variation, Average (%) 3.00%
(-) Variation, Actuarial liabilities R$ 86,071
Actuarial assumption of expected rates of salary increases [member] | F G T S Penalty [Member]  
IfrsStatementLineItems [Line Items]  
Assumptions utilized 3.50%
(+) Variation, Average (%) 4.50%
(+) Variation, Actuarial liabilities R$ 71,226
(-) Variation, Average (%) 2.50%
(-) Variation, Actuarial liabilities R$ 69,899