Name:	csan_DisclosureOfRecentDevelopmentsAndOtherInformationLineItems
Namespace Prefix:	csan_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of sale price of agricultural land.

No definition available.

Name:	csan_SalePriceOfAgriculturalLand
Namespace Prefix:	csan_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The area of land used for agriculture by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 41
-IssueDate 2024-01-01
-Paragraph 46
-Subparagraph b
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=41&code=ifrs-tx-2024-en-r&anchor=para_46_b_i&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_AreaOfLandUsedForAgriculture
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:areaItemType
Balance Type:	na
Period Type:	instant

The description of biological assets. [Refer: Biological assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 41
-IssueDate 2024-01-01
-Paragraph 41
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=41&code=ifrs-tx-2024-en-r&anchor=para_41&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_DescriptionOfBiologicalAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The description of the nature of activities involving biological assets. [Refer: Biological assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 41
-IssueDate 2024-01-01
-Paragraph 46
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=41&code=ifrs-tx-2024-en-r&anchor=para_46_a&doctype=Standard
-URIDate 2024-03-27