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FINANCIAL INSTRUMENTS - Measurement of fair value (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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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

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