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Financial Assets and Liabilities - Summary of Receivables from and Payables to Related Parties (Parenthetical) (Detail)	Dec. 11, 2020 shares
Aguassanta Investimentos S.A.
Disclosure of receivables and payables [line items]
Disposal of shares that were held in treasury	13,021,744

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- Definition

Disclosure of receivables and payables line items.

+ References

No definition available.

+ Details

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Namespace Prefix:	csan_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 106
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=csan_AguassantaInvestimentosSAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: