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Financial Assets and Liabilities - Summary of Sector financial asset and liability (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Reconciliation of changes in net sector financial asset (liability) |  |  |
Net sector financial asset (liability) at beginning of period |  | R$ (324,162) |
Cost of gas | [1] | 228,153 | 201,346
Tax credits | [2] | (542,962) | (565,911)
Interest | [3] | (243,711) | 13,458
Other revenue | [4] | 68,709 | 26,945
Net sector financial asset (liability) at end of period |  | R$ (813,973) | (324,162)
Cost of gas classified in current assets (as a percent) |  | 100.00% |
Sectorial assets |  |  |
Reconciliation of changes in net sector financial asset (liability) |  |  |
Net sector financial asset (liability) at beginning of period |  | R$ 241,749 |
Cost of gas | [1] | 228,153 | 201,346
Tax credits | [2] |  |
Interest | [3] | 19,699 | 13,458
Other revenue | [4] | 68,709 | 26,945
Net sector financial asset (liability) at end of period |  | 558,310 | 241,749
Sectorial liabilities |  |  |
Reconciliation of changes in net sector financial asset (liability) |  |  |
Net sector financial asset (liability) at beginning of period |  | (565,911) |
Cost of gas | [1] |  |
Tax credits | [2] | (542,962) | (565,911)
Interest | [3] | (263,410) |
Other revenue | [4] |  |
Net sector financial asset (liability) at end of period |  | R$ (1,372,283) | R$ (565,911)
[1] | Refers to the cost of gas purchased higher than that contained in the tariffs, 100% classified in current assets, since ARSESP's resolution provides for tariff recovery on a quarterly basis for the industrial segment, which is a substantial part of the volume of gas distributed by the subsidiary Comgás.
[2] | Exclusion of the ICMS from the PIS and COFINS calculation basis.
[3] | Reflect increases in the cost of gas and its transportation cost in accordance with existing gas purchase contracts.
[4] | Corresponding to inflation as measured by the General Market Price Index (Índice Geral de Preços – Mercado), or “IGP-M,” for the residential and commercial segments.

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- Definition The amount of purchased natural gas and electricity that was sold during the period and recognised as an expense arising from recognition of sector financial asset and liability. + References No definition available. + Details
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Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of credits of taxes arising from recognition of sector financial asset and liability. + References No definition available. + Details
Name: | csan_CreditsOfTaxesArisingFromRecognitionOfSectorFinancialAssetAndLiability
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The increase in sector financial asset (liability) resulting from interest income (expenses). + References No definition available. + Details
Name: | csan_IncreaseDecreaseThroughInterestIncomeExpensesSectorFinancialAssetLiability
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The increase in sector financial asset (liability) resulting from other revenue. + References No definition available. + Details
Name: | csan_IncreaseDecreaseThroughOtherRevenueSectorFinancialAssetLiability
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cost of gas classified in current assets. + References No definition available. + Details
Name: | csan_PercentageOfCostOfGasClassifiedInCurrentAssets
Namespace Prefix: | csan_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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- Definition The amount of sector financial assets or liabilities. + References No definition available. + Details
Name: | csan_SectorFinancialAssetLiability
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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- Details
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