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32. Events after the reporting period (Details Narrative) - 22nd Issue Debentures R$ in Thousands | Feb. 19, 2018 BRL (R$)
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DisclosureOfEventsAfterReportingPeriodLineItems [Line Items] |
Unsecured non-convertible debentures | R$ 750,000
First series |
DisclosureOfEventsAfterReportingPeriodLineItems [Line Items] |
Unsecured non-convertible debentures | 100,000
Second series |
DisclosureOfEventsAfterReportingPeriodLineItems [Line Items] |
Unsecured non-convertible debentures | 400,000
Third series |
DisclosureOfEventsAfterReportingPeriodLineItems [Line Items] |
Unsecured non-convertible debentures | R$ 250,000

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- References No definition available. + Details
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Period Type: | duration

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- Definition Unsecured nonconvertible debentures + References No definition available. + Details
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Namespace Prefix: | SBS_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |