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20. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL, ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities R$ 635,388 R$ 623,247
Judicial deposits 325,117 328,371
Accrued liabilities current 81,073 96,479
Accrued liabilities non current 554,315 526,768
Judicial deposits current
Judicial deposits non current 325,117 328,371
Tax [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 134,645 128,411
Judicial deposits 2,444 31,060
Social security [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 8,170 7,039
Judicial deposits
Labor [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 328,334 305,309
Judicial deposits 212,737 227,213
Civil [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 151,776 138,990
Judicial deposits 67,819 53,771
Environmental [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 12,463 43,498
Judicial deposits 17,683 3,731
Deposit of a guarantee [member]    
ProvisionForTaxSocialSecurityLaborCivilEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities
Judicial deposits R$ 24,434 R$ 12,596