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Financial risk management - Schedule of projection of settlement of positions, at nominal value of energy trading operations (Details) - Price risk - Electricity trading [member] R$ in Thousands	Dec. 31, 2021 BRL (R$)
Up to 1 year [member]
Financial position and unrealized gains on electricity trading operations, net
Positions to be settled	R$ (248,115)
From 1 to 2 years [member]
Financial position and unrealized gains on electricity trading operations, net
Positions to be settled	(13,822)
From 2 to 3 years
Financial position and unrealized gains on electricity trading operations, net
Positions to be settled	1,093
Above 2025
Financial position and unrealized gains on electricity trading operations, net
Positions to be settled	R$ 12,721

X

- Definition

The nominal value of hedging instruments.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=ifrs-full_ElectricityDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MaturityAxis=csan_LaterThanFourYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: