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v3.24.1.1.u2

Borrowings and financing (Details 6) R$ in Thousands | Mar. 31, 2024 BRL (R$)
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IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | R$ 2,734
Brazilian Federal Savings Bank [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | 926
Brazilian Developments Bank B N D E S [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | 30
Inter American Development Bank I D B [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | 739
International Bank For Reconstruction And Developmenst [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | 1,032
Other Borrowings And Financing [Member] |
IfrsStatementLineItems [Line Items] |
Borrowings and financing - credit limits | R$ 7

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

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Period Type: |

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Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sbs_BrazilianDevelopmentsBankBNDESMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sbs_InterAmericanDevelopmentBankIDBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=sbs_InternationalBankForReconstructionAndDevelopmenstMember
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Data Type: | na
Balance Type: |
Period Type: |

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Balance Type: |
Period Type: |