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4. CASH AND CASH EQUIVALENTS (Details)
€ in Thousands, £ in Thousands, R$ in Thousands, $ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
GBP (£)
CashAndCashEquivalentLineItems [Line Items]                
Cash and bank accounts   R$ 2,439,072       R$ 2,289,787    
Cash equivalents   3,667,132       883,265    
Cash and cash equivalents   R$ 7,576,625       4,237,785    
U.S. dollars (USD)                
CashAndCashEquivalentLineItems [Line Items]                
Cash and bank accounts | $ $ 1,185,208       $ 1,356,128      
U.S. dollars (USD) | Term Deposit [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash equivalents | $ $ 198,878       270,714      
Average rate (p.a.) [1] 0.71% 0.71% 0.71% 0.71%        
U.S. dollars (USD) | Overnight [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash equivalents | $ $ 1,220,232       $ 689,874      
Average rate (p.a.) [1] 0.07% 0.07% 0.07% 0.07%        
Brazilian Reais                
CashAndCashEquivalentLineItems [Line Items]                
Cash and bank accounts   R$ 112,181       167,051    
Brazilian Reais | Investment funds [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash equivalents   R$ 4,684       3,507    
Average rate (p.a.) [1] 0.05% 0.05% 0.05% 0.05%        
Brazilian Reais | Bank deposit certificates [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash equivalents   R$ 3,662,448       R$ 879,758    
Average rate (p.a.) [1] 1.86% 1.86% 1.86% 1.86%        
Euros (EUR)                
CashAndCashEquivalentLineItems [Line Items]                
Cash and bank accounts | €     € 54,687       € 71,626  
Other Currencies [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash and bank accounts | £       £ 1,086,996       £ 694,982
Other Currencies [member] | Term Deposit [member]                
CashAndCashEquivalentLineItems [Line Items]                
Cash equivalents | £       £ 51,311       £ 104,145
Average rate (p.a.) [1]        
[1] Weighted average annual rate.