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Financial Assets and Liabilities - Summary of Changes in Expected Credit Losses (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Trade Receivables [abstract] |  |
Beginning balance | R$ (136,024) | R$ (120,407)
Provision / reversal | (10,762) | (39,187)
Foreign exchange | (340) |
Write-off | 32,074 | 23,570
Ending balance | R$ (115,052) | R$ (136,024)

X
- Definition The amount of allowance for doubtful accounts receivable. + References No definition available. + Details
Name: | csan_AllowanceForDoubtfulAccounts
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents change in the amount of expected credit losses on accounts receivable due to foreign exhange variation. + References No definition available. + Details
Name: | csan_ChangeInAllowanceForDoubtfulAccountsDueToForeignExchangeVariation
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of provision expense (reversal of provision expense) for expected credit loss on accounts receivable. + References No definition available. + Details
Name: | csan_ProvisionReversalsAllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Trade receivables. + References No definition available. + Details
Name: | csan_TradeReceivablesAbstract
Namespace Prefix: | csan_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of direct write-downs of accounts receivable charged against the allowance. + References No definition available. + Details
Name: | csan_WriteOffAllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | csan_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant