XML 122 R100.htm IDEA: XBRL DOCUMENT
v3.22.1

Financial assets and liabilities - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021
Disclosure of sensitivity analysis of financial instruments changes in foreign exchange rates [line items] |
Description of methods and assumptions used in preparing sensitivity analysis | Stressed scenarios (positive and negative effects before tax effects) were defined based on changes of a 25% and 50% to the U.S. dollar and Euro exchange rate used in the probable scenario.
Percentage of increase in actuarial assumption | 0.50%
Percentage of decrease in actuarial assumption | 0.50%
25% [member] |
Disclosure of sensitivity analysis of financial instruments changes in foreign exchange rates [line items] |
Percentage of increase in actuarial assumption | 25.00%
Percentage of decrease in actuarial assumption | 25.00%
50% [member] |
Disclosure of sensitivity analysis of financial instruments changes in foreign exchange rates [line items] |
Percentage of increase in actuarial assumption | 50.00%
Percentage of decrease in actuarial assumption | 50.00%

X
- Definition Disclosure of sensitivity analysis of financial instruments changes in foreign exchange rates. + References No definition available. + Details
Name: | csan_DisclosureOfSensitivityAnalysisOfFinancialInstrumentsChangesInForeignExchangeRatesLineItems
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The description of methods and assumptions used when preparing a sensitivity analysis for types of market risk to which the entity is exposed. [Refer: Market risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 40 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_40_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_MethodsAndAssumptionsUsedInPreparingSensitivityAnalysis
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_145_a&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=csan_ActuarialAssumptionOfChangeInInterestRateOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=csan_ActuarialAssumptionOfChangeInInterestRateTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |