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Intangible assets (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Current liabilities R$ 452,323 R$ 487,926
Noncurrent liabilities 2,853,896 2,798,688
Total liabilities 3,306,219 3,286,614
Alto Tiete [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 52,762
Noncurrent liabilities
Total liabilities 52,762
Sao Lourenco [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 452,323 435,164
Noncurrent liabilities 2,853,896 2,798,688
Total liabilities R$ 3,306,219 R$ 3,233,852