Related-party balances and transactions (Details 1) - BRL (R$) R$ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
IfrsStatementLineItems [Line Items]
Revenues	R$ 6,560,246	R$ 5,698,369
Revenue From Sanitation Services [Member]
IfrsStatementLineItems [Line Items]
Revenues	162,966	186,144
Payments From Related Parties [Member]
IfrsStatementLineItems [Line Items]
Revenues	(167,612)	(186,205)
Payment Received From Reimbursement [Member]
IfrsStatementLineItems [Line Items]
Revenues	R$ (52,593)	R$ (47,816)

The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/exampleRef
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Reference 11: http://www.xbrl.org/2003/role/exampleRef
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+ Details