XML 91 R69.htm IDEA: XBRL DOCUMENT
v3.22.1

Financial Assets and Liabilities - Summary of Financial Investments (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Cash and cash equivalents1 [line items] |  |
Financial investments | R$ 13,481,291 | R$ 8,522,465
Investment fund [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 8,103,713 | 2,155,446
Investment fund [member] | Repurchase agreements [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 1,680,328 | 1,672,688
Investment fund [member] | Bank certificate of deposits [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 6,423,385 | 475,213
Investment fund [member] | Other [Member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments |  | 7,545
Bank investments [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 5,377,578 | 6,367,019
Bank investments [member] | Repurchase agreements [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 974,494 | 1,293,833
Bank investments [member] | Bank certificate of deposits [member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | 2,321,614 | 5,015,244
Bank investments [member] | Other [Member] |  |
Cash and cash equivalents1 [line items] |  |
Financial investments | R$ 2,081,470 | R$ 57,942

X
- Definition Cash and cash equivalents1 [line items]. + References No definition available. + Details
Name: | csan_CashAndCashEquivalents1LineItems
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ShorttermInvestmentsClassifiedAsCashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_UnconsolidatedStructuredEntitiesAxis=ifrs-full_InvestmentFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=csan_RepurchaseAgreements1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=csan_BankCertificateOfDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=csan_OtherBankInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_UnconsolidatedStructuredEntitiesAxis=csan_BankInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |