XML 207 R185.htm IDEA: XBRL DOCUMENT
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Financial Assets and Liabilities - Summary of movement of the obligation with preferred shareholders (Detail) R$ in Thousands | Dec. 31, 2021 BRL (R$)
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Disclosure Of Movement Obligation With Preferred Shareholders [Line Items] |
Beginning balance | R$ 387,044
Ending balance |

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- Definition Disclosure of movement obligation with preferred shareholders. + References No definition available. + Details
Name: | csan_DisclosureOfMovementObligationWithPreferredShareholdersLineItems
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Preferred shareholders payable subsidiaries non current + References No definition available. + Details
Name: | csan_PreferredShareholdersPayableSubsidiariesNonCurrent
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant