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TRADE ACCOUNTS PAYABLE (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Trade accounts payable    
Trade accounts payable R$ 2,361,098 R$ 2,376,459
Pulp | Klabin S.A.    
Trade accounts payable    
Trade accounts payable   936,887
Domestic (Brazil) | Related parties    
Trade accounts payable    
Trade accounts payable 2,849 2,477
Domestic (Brazil) | Third parties    
Trade accounts payable    
Trade accounts payable 1,865,632 1,288,775
Foreign | Third parties    
Trade accounts payable    
Trade accounts payable R$ 492,617 R$ 1,085,207