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Intangible assets (Details 2) - BRL (R$) R$ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
IfrsStatementLineItems [Line Items]
Intangible assets	R$ 2,744,673	R$ 2,791,226
Alto Tiete [Member]
IfrsStatementLineItems [Line Items]
Intangible assets	231,146	235,224
Sao Lourenco [Member]
IfrsStatementLineItems [Line Items]
Intangible assets	R$ 2,513,527	R$ 2,556,002

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