XML 259 R183.htm IDEA: XBRL DOCUMENT v3.25.1

Events after the reporting period (Details Narrative) - Events After Reporting Period [Member] - BRL (R$) R$ in Millions	Apr. 09, 2025	Feb. 28, 2025
IfrsStatementLineItems [Line Items]
Issuance of unsecured debenture		R$ 3,700
Judicial payment updated amount	R$ 2,480

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- References

No definition available.

+ Details

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

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- References

No definition available.

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Name:	sbs_IssuanceOfUnsecuredDebenture
Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

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Name:	sbs_JudicialPaymentUpdatedAmount
Namespace Prefix:	sbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=sbs_EventsAfterReportingPeriodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: