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Risks and Financial Instruments - Positions of derivative financial instruments to hedge commodity price risk (Detail) - Commodity price risk [member] R$ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022 BRL (R$) m³	Dec. 31, 2021 BRL (R$) m³	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items]
Fair value	R$ (67,695)	R$ 1,302
Probable Scenario [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	R$ (157,697)	R$ (65,679)
Heating Oil [member] | Term [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount (m3) | m³	158,828	167,255
Notional amount (USD thousands) | $			$ 150,498	$ 103,148
Fair value	R$ (52,214)	R$ 2,269
Heating Oil [member] | Term [member] | Probable Scenario [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	R$ (124,293)	R$ (55,066)
RBOB [member] | Term [member]
Disclosure of detailed information about financial instruments [line items]
Notional amount (m3) | m³	52,466	29,413
Notional amount (USD thousands) | $			$ 31,382	$ 17,112
Fair value	R$ (15,481)	R$ (967)
RBOB [member] | Term [member] | Probable Scenario [member]
Disclosure of detailed information about financial instruments [line items]
Fair value	R$ (33,404)	R$ (10,613)

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- 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.

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The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 22
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b
-URIDate 2022-03-24

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- Definition

The nominal amount of the hedging instruments in hedging relationships to which the entity is applying the exceptions in the scope of the amendments for interest rate benchmark reform. [Refer: Nominal amount of hedging instrument]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 24H
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24H_e&doctype=Standard
-URIDate 2022-03-24

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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