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v3.22.1

Share-based Payment - Summary of share-based payment plan (Equity-settled) (Detail) - Equity-settled plans [member] | 12 Months Ended
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Dec. 31, 2021 R$ / shares
Vesting Conditions [Abstract] |
Concession Amount Per Share | R$ 0.01
Investment Program One [Member] | Performance Stocks [Member] |
Vesting Conditions [Abstract] |
Period of Continued Employment Under Service Conditions | 3 years
Percentage of Achievement to Calculate Fair Value | 100.00%
Investment Program One [Member] | Performance Stocks [Member] | Bottom of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 0.00%
Investment Program One [Member] | Performance Stocks [Member] | Top of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 200.00%
Investment Program Two [Member] | Performance Stocks [Member] |
Vesting Conditions [Abstract] |
Period of Continued Employment Under Service Conditions | 4 years
Percentage of Achievement to Calculate Fair Value | 100.00%
Investment Program Two [Member] | Performance Stocks [Member] | Bottom of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 0.00%
Investment Program Two [Member] | Performance Stocks [Member] | Top of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 150.00%
Investment Program Three [Member] | Restricted Stocks [Member] |
Vesting Conditions [Abstract] |
Period of Continued Employment Under Service Conditions | 5 years
Percentage of Long Term Incentive Program whichIs Equivalent to Restricted Shares | 25.00%
Rumo S A [member] | Special Program 2021 [Member] |
Vesting Conditions [Abstract] |
Period of Continued Employment Under Service Conditions | 5 years
Rumo S A [member] | Other Than Special Program 2021 [Member] |
Vesting Conditions [Abstract] |
Period of Continued Employment Under Service Conditions | 3 years
Percentage of Achievement to Calculate Fair Value | 100.00%
Rumo S A [member] | Other Than Special Program 2021 [Member] | Bottom of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 0.00%
Rumo S A [member] | Other Than Special Program 2021 [Member] | Top of range [member] |
Vesting Conditions [Abstract] |
Percentage of Achievement Of Specific Metrics | 150.00%

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- Definition The per share amount of concession under the share-based payment programs. + References No definition available. + Details
Name: | csan_ConcessionAmountPerShare
Namespace Prefix: | csan_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of achievement of specific metrics under the share-based payment programs. + References No definition available. + Details
Name: | csan_PercentageOfAchievementOfSpecificMetrics
Namespace Prefix: | csan_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of achievement to calculate fair value in share-based payment programs. + References No definition available. + Details
Name: | csan_PercentageOfAchievementToCalculateFairValue
Namespace Prefix: | csan_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of Long-Term Incentive Program which is equivalent to restricted shares under the share-based payment programs. + References No definition available. + Details
Name: | csan_PercentageOfLongTermIncentiveProgramWhichIsEquivalentToRestrictedShares
Namespace Prefix: | csan_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The period of continued employment under service conditions in share-based payment arrangements. + References No definition available. + Details
Name: | csan_PeriodOfContinuedEmploymentUnderServiceConditions
Namespace Prefix: | csan_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | csan_VestingConditionsAbstract
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | csan_ProgramNameAxis=csan_InvestmentProgramOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | csan_AwardTypesAxis=csan_PerformanceStocksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | csan_ProgramNameAxis=csan_InvestmentProgramTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | csan_ProgramNameAxis=csan_SpecialProgram2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |