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Operating revenue (Details) - BRL (R$) R$ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Notes and other explanatory information [abstract]
Revenue from sanitation services (i)	R$ 5,661,099	R$ 4,909,274
Construction revenue	1,336,778	1,179,534
Sales tax	(410,786)	(370,298)
Regulation, Control and Oversight Fee (TRCF)	(26,845)	(20,141)
Net revenue	R$ 6,560,246	R$ 5,698,369

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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.

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