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Provision for legal proceedings and judicial deposits - Summary of Provision for Legal Proceedings and Judicial Deposits (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Provision for legal proceedings | R$ 1,644,061 | R$ 1,360,898 | R$ 1,354,171
Judicial deposit | 923,061 | 875,842 |
Legal proceedings provision, tax [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Provision for legal proceedings | 647,610 | 635,406 | 589,180
Judicial deposit | 500,484 | 462,197 |
Civil, environmental and regulatory [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Provision for legal proceedings | 585,034 | 350,769 |
Judicial deposit | 169,857 | 140,833 |
Legal proceedings provision, labor [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Provision for legal proceedings | 411,417 | 374,723 | R$ 432,464
Judicial deposit | R$ 252,720 | R$ 272,812 |

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- Definition The amount of reserves that is held in deposit at judicial courts for legal proceedings. + References No definition available. + Details
Name: | csan_MandatoryJudicialDepositsForLegalProceedings
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
Name: | ifrs-full_DisclosureOfOtherProvisionsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of non-current provision for legal proceedings. [Refer: Legal proceedings provision] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Section Example 10 A court case -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&doctype=Illustrative%20Examples&dita_xref=IAS37_IE_C_ex10__IAS37_IE_C_ex10_TI -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 37 -IssueDate 2021-01-01 -Paragraph 87 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2021-en-r&anchor=para_87&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_LongtermLegalProceedingsProvision
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=csan_LegalProceedingsProvisionTaxMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=csan_CivilEnvironmentalAndRegulatoryClaimsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=csan_LegalProceedingsProvisionLaborMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |