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FINANCIAL INSTRUMENTS - Measurement of fair value (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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FINANCIAL INSTRUMENTS |  |
Total financial assets | R$ 4,357,884 | R$ 4,834,178
Total financial liabilities | 19,838,551 | 18,184,601
Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 4,357,884 | 4,834,178
Total financial liabilities | 19,838,551 | 18,184,601
Short-term debts | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 1,424,043 | 1,544,211
Long-term debt | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 13,188,891 | 11,594,612
Debentures |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 2,902,417 | 2,911,044
Debentures | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 7,463 | 18,015
Non-current financial liabilities | 2,894,954 | 2,893,029
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 |
Related parties |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 22,855 |
Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 22,855 |
Obligation with FIDC |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 987,406 | 1,018,501
Obligation with FIDC | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 42,893 | 1,018,501
Lease liabilities |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 944,513 |
Other current liabilities |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 797,082 | 666,858
Other current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 797,082 | 666,858
Other non-current liabilities |  |
FINANCIAL INSTRUMENTS |  |
Total financial liabilities | 514,886 | 449,375
Other non-current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 514,886 | 449,375
Short-term investments |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 3,041,143 | 3,652,949
Short-term investments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 3,041,143 | 3,652,949
Fair value of derivatives |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets |  | 2,846
Fair value of derivatives | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets |  | 2,846
Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 134,354 | 95,445
Other current assets |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 591,523 | 618,769
Other current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 591,523 | 618,769
Other non-current assets |  |
FINANCIAL INSTRUMENTS |  |
Total financial assets | 590,864 | 464,169
Other non-current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 590,864 | 464,169
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 | 4,357,884 | 4,834,178
Total financial liabilities | 19,838,551 | 18,184,601
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Short-term debts | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 1,424,043 | 1,544,211
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Long-term debt | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 13,188,891 | 11,594,612
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Debentures | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 7,463 | 18,015
Non-current financial liabilities | 2,894,954 | 2,893,029
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) | Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 22,855 |
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Obligation with FIDC | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 42,893 | 1,018,501
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Lease liabilities |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 944,513 |
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial liabilities | 797,082 | 666,858
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other non-current liabilities | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial liabilities | 514,886 | 449,375
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Short-term investments | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 3,041,143 | 3,652,949
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 assets |  | 2,846
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Related parties | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | 134,354 | 95,445
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Current financial assets | 591,523 | 618,769
Quoted Prices in Non-Active Markets for Similar Assets (Level 2) | Other non-current assets | Fair Value - Measured at Fair Value on a Recurring Basis |  |
FINANCIAL INSTRUMENTS |  |
Non-current financial assets | R$ 590,864 | R$ 464,169

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