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Intangible assets (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
IfrsStatementLineItems [Line Items]    
Current liabilities R$ 222,413 R$ 142,757
Noncurrent liabilities 2,736,768 2,917,428
Total liabilities 2,959,181 3,060,185
Alto Tiete [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 91,782 69,442
Noncurrent liabilities 36,645 102,873
Total liabilities 128,427 172,315
Sao Lourenco [Member]    
IfrsStatementLineItems [Line Items]    
Current liabilities 130,631 73,315
Noncurrent liabilities 2,700,123 2,814,555
Total liabilities R$ 2,830,754 R$ 2,887,870