FINANCIAL INSTRUMENTS - Measurement of fair value (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2021	Dec. 31, 2020
FINANCIAL INSTRUMENTS
Total financial assets	R$ 3,882,966	R$ 4,357,884
Total financial liabilities	15,622,107	19,838,551
Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Total financial assets	3,882,966	4,357,884
Total financial liabilities	15,622,107	19,838,551
Liabilities, Short-term debts \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	234,537	1,424,043
Liabilities, Long-term debt \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	10,875,249	13,188,891
Liabilities, Debentures
FINANCIAL INSTRUMENTS
Total financial liabilities	2,929,907	2,902,417
Liabilities, Debentures \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	1,531,956	7,463
Non-current financial liabilities	1,397,951	2,894,954
Fair value of derivatives
FINANCIAL INSTRUMENTS
Total financial liabilities		971
Fair value of derivatives \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities		971
Liabilities, Related parties
FINANCIAL INSTRUMENTS
Total financial liabilities	24,648	22,855
Liabilities, Related parties \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	24,648	22,855
Liabilities, Obligation with FIDC \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	45,497	944,513
Non-current financial liabilities		42,893
Liabilities, Obligations with FIDC (non-current liabilities)
FINANCIAL INSTRUMENTS
Total financial liabilities		42,893
Liabilities, Other current liabilities
FINANCIAL INSTRUMENTS
Total financial liabilities	1,090,396	797,082
Liabilities, Other current liabilities \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	1,090,396	797,082
Liabilities, Other non-current liabilities
FINANCIAL INSTRUMENTS
Total financial liabilities	421,873	514,886
Liabilities, Other non-current liabilities \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	421,873	514,886
Assets, Short-term investments
FINANCIAL INSTRUMENTS
Total financial assets	2,626,212	3,041,143
Assets, Short-term investments \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	2,626,212	3,041,143
Assets, Fair value of derivatives
FINANCIAL INSTRUMENTS
Total financial assets	3,246
Assets, Fair value of derivatives \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	3,246
Assets, Related parties
FINANCIAL INSTRUMENTS
Total financial assets	2,678	134,354
Assets, Related parties \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial assets	2,678	134,354
Assets, Other current assets
FINANCIAL INSTRUMENTS
Total financial assets	679,193	591,523
Assets, Other current assets \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	679,193	591,523
Assets, Other non-current assets
FINANCIAL INSTRUMENTS
Total financial assets	571,637	590,864
Assets, Other non-current assets \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial assets	571,637	590,864
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Total financial assets	3,882,966	4,357,884
Total financial liabilities	15,622,107	19,838,551
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Short-term debts \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	234,537	1,424,043
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Long-term debt \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	10,875,249	13,188,891
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Debentures \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	1,531,956	7,463
Non-current financial liabilities	1,397,951	2,894,954
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Fair value of derivatives \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities		971
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Related parties \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	24,648	22,855
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Obligation with FIDC \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	45,497	944,513
Non-current financial liabilities		42,893
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Other current liabilities \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial liabilities	1,090,396	797,082
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Liabilities, Other non-current liabilities \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial liabilities	421,873	514,886
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Assets, Short-term investments \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	2,626,212	3,041,143
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Assets, Fair value of derivatives \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	3,246
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Assets, Related parties \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial assets	2,678	134,354
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Assets, Other current assets \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Current financial assets	679,193	591,523
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) \| Assets, Other non-current assets \| Fair Value - Measured at Fair Value on a Recurring Basis
FINANCIAL INSTRUMENTS
Non-current financial assets	R$ 571,637	R$ 590,864

The amount of current financial assets. [Refer: Financial assets]

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The amount of current financial liabilities. [Refer: Financial liabilities]

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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 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: Financial instruments, class [member]; Financial liabilities]

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- Definition

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: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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The amount of non-current financial assets. [Refer: Financial assets]

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The amount of non-current financial liabilities. [Refer: Financial liabilities]

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