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EMPLOYEE BENEFIT PLANS - Rollforward of actuarial liability (Details) - Defined benefit plan - BRL (R$)
R$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Rollforward of actuarial liability    
Beginning balance R$ 785,045 R$ 736,179
Interest on actuarial liabilities 27,925 53,092
Actuarial loss   33,843
Employee contribution   (88)
Exchange rate variation (78) 487
Benefits paid (20,505) (38,468)
Ending balance R$ 792,387 R$ 785,045