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Operations - Additional Information (Detail)	Mar. 28, 2019
Disclosure of background and operations [Line Items]
Contractual Term	30 years

X

- Definition

Contractual term.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent disclosure of background and operations.

+ References

No definition available.

+ Details

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