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Concessions payable - Summary of judicial deposits (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of judicial deposits [line items] |  |
Judicial deposits | R$ 22,119 | R$ 22,119
Rumo Malha Oeste [member] |  |
Disclosure of judicial deposits [line items] |  |
Judicial deposits | R$ 22,119 | R$ 22,119

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- Definition Disclosure of judicial deposits [line items] + References No definition available. + Details
Name: | csan_DisclosureOfJudicialDepositsLineItems
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Judicial deposits. + References No definition available. + Details
Name: | csan_JudicialDeposits
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=csan_RumoMalhaOesteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |