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Post-employment Benefits - Summary of Assumptions to Determine Defined Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Health Plan
Aging factor	3.00%
Defined benefit [member] | Defined benefit [member]
Health Plan
Discount rate (per year)	8.64%	7.20%
Inflation rate (per year)	3.25%	3.00%
Increase in pension plans (per year)	3.25%	3.00%
Health plan [member] | Health Plan
Health Plan
Discount rate (per year)	9.09%	7.43%
Inflation rate (per year)	3.50%	3.50%
Future salary increases	6.60%	6.60%
Increase in pension plans (per year)	3.00%	6.60%
Overall mortality (segregated by gender)	AT-2000
Disable mortality table	IAPB-1957
Entry into disability (modified)	UP-84 Modified
Turnover	0.60/ (services time +1)

X

- Definition

The aging factor used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

+ Details

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X

- Definition

The disabled mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

The entry into disability used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

+ Details

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X

- Definition

The mortality used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

+ Details

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X

- Definition

The turnover used as a significant actuarial assumption to determine the present value of a defined benefit obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	csan_
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X

- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 144
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard
-URIDate 2021-03-24

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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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- Details

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- Details

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- Details

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- Details

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