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Trade receivables (Details Narrative) - BRL (R$) R$ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Trade Receivables |  |
Registered warrants current | R$ 3,232,377 | R$ 3,085,265

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Namespace Prefix: | sbs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Namespace Prefix: | sbs_
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Balance Type: | credit
Period Type: | instant