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Net sales - Additional Information (Details - Textual)	12 Months Ended
	Dec. 31, 2021
Disclosure of disaggregation of revenue from contracts with customers [abstract]
Period of tariff cycles for natural gas sales, with annual inflation adjustment	5 years

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- Definition

The period of tariff cycles for natural gas sales, with annual inflation adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	csan_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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