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Concessions payable - Summary of judicial deposits (Detail) - BRL (R$) R$ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of judicial deposits [line items]
Judicial deposits	R$ 22,119	R$ 22,119
Rumo Malha Oeste [member]
Disclosure of judicial deposits [line items]
Judicial deposits	R$ 22,119	R$ 22,119

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- Definition

Disclosure of judicial deposits [line items]

+ References

No definition available.

+ Details

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Namespace Prefix:	csan_
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- Definition

Judicial deposits.

+ References

No definition available.

+ Details

Name:	csan_JudicialDeposits
Namespace Prefix:	csan_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
Period Type: