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EMPLOYEE BENEFIT PLANS - Rollforward of actuarial liability (Details) - Defined benefit plan - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Rollforward of actuarial liability    
Beginning balance R$ 736,179 R$ 430,427
Business combination   147,877
Interest on employee benefits 53,092 44,496
Actuarial loss 33,843 147,640
Employee contribution (88)  
Exchange rate variation 487  
Benefits paid in the year (38,468) (34,261)
Ending balance R$ 785,045 R$ 736,179