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TRADE ACCOUNTS RECEIVABLE - Trade accounts receivable by maturity (Details) - Trade accounts receivable - BRL (R$)
R$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 3,979,086 R$ 2,915,206
Neither past due nor impaired | Current    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 3,910,996 2,603,229
Past due but not impaired | Up to 30 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 19,190 209,210
Past due but not impaired | From 31 to 60 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 7,167 51,420
Past due but not impaired | From 61 to 90 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 4,502 2,062
Past due but not impaired | From 91 to 120 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 5,724 6,665
Past due but not impaired | From 121 to 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets 8,278 8,618
Past due but not impaired | More than 180 days    
TRADE ACCOUNTS RECEIVABLE    
Financial assets R$ 23,229 R$ 34,002