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INTANGIBLE ASSETS - Changes in intangible assets by type (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
INTANGIBLE ASSETS      
Balance at beginning of the year R$ 673,262 R$ 836,096 R$ 972,089
Foreign exchange effect 127,770 19,195 107,434
Acquisition 154,250 100,313 67,388
Disposal     (3,879)
Amortization (332,704) (282,342) (306,936)
Balance at end of the year 622,578 673,262 836,096
Supplier relationships      
INTANGIBLE ASSETS      
Balance at beginning of the year 21,415 26,719 32,786
Amortization (4,637) (5,304) (6,067)
Balance at end of the year 16,778 21,415 26,719
Software development      
INTANGIBLE ASSETS      
Balance at beginning of the year 364,812 415,640 490,829
Foreign exchange effect 42,890 6,137 28,598
Acquisition 154,250 100,313 67,388
Disposal     (3,791)
Amortization (188,083) (157,278) (167,384)
Balance at end of the year R$ 373,869 364,812 415,640
Estimated useful lives 7 years    
Customers contracts and relationships      
INTANGIBLE ASSETS      
Balance at beginning of the year R$ 283,423 387,299 440,774
Foreign exchange effect 83,806 12,586 77,593
Disposal     (88)
Amortization (136,525) (116,462) (130,980)
Balance at end of the year 230,704 283,423 387,299
Others      
INTANGIBLE ASSETS      
Balance at beginning of the year 3,612 6,438 7,700
Foreign exchange effect 1,074 472 1,243
Amortization (3,459) (3,298) (2,505)
Balance at end of the year R$ 1,227 R$ 3,612 R$ 6,438
Estimated useful lives 5 years    
Minimum | Supplier relationships      
INTANGIBLE ASSETS      
Estimated useful lives 5 years    
Minimum | Customers contracts and relationships      
INTANGIBLE ASSETS      
Estimated useful lives 5 years    
Maximum | Supplier relationships      
INTANGIBLE ASSETS      
Estimated useful lives 20 years    
Maximum | Customers contracts and relationships      
INTANGIBLE ASSETS      
Estimated useful lives 20 years