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Financial Assets and Liabilities - Summary of Changes in Expected Credit Losses (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	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