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v3.24.1.1.u2

Restricted cash (Details) - BRL (R$) R$ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
IfrsStatementLineItems [Line Items] |  |
Restricted cash | R$ 45,694 | R$ 54,944
Agreementwiththe Sao Paulo Municipal Government [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Restricted cash | 38,690 | 47,749
Brazilian Federal Savings Bank Escrow Deposites [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Restricted cash | 442 | 365
Other [Member] |  |
IfrsStatementLineItems [Line Items] |  |
Restricted cash | R$ 6,562 | R$ 6,830

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_RestrictedCashAndCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=sbs_AgreementwiththeSaoPauloMunicipalGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=sbs_BrazilianFederalSavingsBankEscrowDepositesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=sbs_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |