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Financial instruments - Exchange rate risk management (Details) - Currency risk [member] - BRL (R$) R$ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2023	Dec. 31, 2024
United States of America, Dollars
Disclosure of detailed information about financial instruments [line items]
Financial assets	R$ 24,899,925		R$ 17,543,554
Financial liabilities	(74,036,355)		(94,897,365)
Net Financial Assets (Liabilities)	(49,136,430)		(77,353,811)
United States of America, Dollars | Trade accounts payable
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(1,067,725)		(1,350,763)
United States of America, Dollars | Loans and financing
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(69,042,086)		(83,004,915)
United States of America, Dollars | Liabilities for assets acquisitions and subsidiaries
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(68,670)		(93,308)
United States of America, Dollars | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	(3,857,874)		(10,448,379)
United States of America, Dollars | Cash and cash equivalents
Disclosure of detailed information about financial instruments [line items]
Financial assets	14,607,009		6,496,039
United States of America, Dollars | Marketable securities
Disclosure of detailed information about financial instruments [line items]
Financial assets	807,263		70,255
United States of America, Dollars | Trade accounts receivable
Disclosure of detailed information about financial instruments [line items]
Financial assets	4,497,967		7,090,160
United States of America, Dollars | Derivative financial instruments
Disclosure of detailed information about financial instruments [line items]
Financial assets	R$ 4,987,686		R$ 3,887,100
Selling transactions in the futures markets
Disclosure of detailed information about financial instruments [line items]
Value at Risk Time Horizon	24 years	24 years

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

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The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Classes of financial instruments [domain]; Financial assets; Derivatives [member]]

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