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FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Sensitivity analysis - exposure to interest rates (Details) - Interest rate risk R$ in Thousands	12 Months Ended
	Dec. 31, 2020 BRL (R$)
CDI/SELIC | Cash and cash equivalents | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	R$ 115,032
CDI/SELIC | Cash and cash equivalents | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	546
CDI/SELIC | Cash and cash equivalents | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	1,093
CDI/SELIC | Marketable securities | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	2,396,857
CDI/SELIC | Marketable securities | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	11,385
CDI/SELIC | Marketable securities | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	22,770
CDI/SELIC | Loans and financing | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	9,715,511
CDI/SELIC | Loans and financing | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	46,149
CDI/SELIC | Loans and financing | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial assets attributable to an increase in measurement input	92,297
CDI | Derivatives Non Deliverable Forward ("NDF") | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	7,948
CDI | Derivatives Non Deliverable Forward ("NDF") | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(2,409)
CDI | Derivatives Non Deliverable Forward ("NDF") | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(4,786)
CDI | Derivatives Non Deliverable Forward ("NDF") | Possible (-25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	2,442
CDI | Derivatives Non Deliverable Forward ("NDF") | Remote (-50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	4,916
CDI | Derivative options | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(780,896)
CDI | Derivative options | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(43,105)
CDI | Derivative options | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(85,545)
CDI | Derivative options | Possible (-25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	43,800
CDI | Derivative options | Remote (-50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	88,323
CDI | Derivative swaps | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(6,503,859)
CDI | Derivative swaps | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(22,941)
CDI | Derivative swaps | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(45,441)
CDI | Derivative swaps | Possible (-25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	23,367
CDI | Derivative swaps | Remote (-50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	47,086
TJLP | Loans and financing | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	1,553,635
TJLP | Loans and financing | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	17,673
TJLP | Loans and financing | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	35,345
LIBOR | Loans and financing | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	18,923,543
LIBOR | Loans and financing | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	11,277
LIBOR | Loans and financing | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	22,555
LIBOR | Derivative swaps | Probable
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	(6,503,859)
LIBOR | Derivative swaps | Possible (+25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	45,349
LIBOR | Derivative swaps | Remote (+50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an increase in measurement input	90,699
LIBOR | Derivative swaps | Possible (-25%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	(45,364)
LIBOR | Derivative swaps | Remote (-50%)
FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT
Effect on profit or loss and equity due to changes in fair value of financial liabilities attributable to an decrease in measurement input	R$ (90,726)

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