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v3.22.1

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

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- Definition Contractual term. + References No definition available. + Details
Name: | csan_ContractualTerm
Namespace Prefix: | csan_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- 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