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Financial risk management - Schedule of projection of settlement of positions, at nominal value of energy trading operations (Details) - Price risk - Electricity trading [member] R$ in Thousands | Dec. 31, 2021 BRL (R$)
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Up to 1 year [member] |
Financial position and unrealized gains on electricity trading operations, net |
Positions to be settled | R$ (248,115)
From 1 to 2 years [member] |
Financial position and unrealized gains on electricity trading operations, net |
Positions to be settled | (13,822)
From 2 to 3 years |
Financial position and unrealized gains on electricity trading operations, net |
Positions to be settled | 1,093
Above 2025 |
Financial position and unrealized gains on electricity trading operations, net |
Positions to be settled | R$ 12,721

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- Definition The nominal value of hedging instruments. + References No definition available. + Details
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Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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

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- Details
Name: | ifrs-full_ProductsAndServicesAxis=ifrs-full_ElectricityDistributionMember
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: |
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Balance Type: |
Period Type: |

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