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TRADE ACCOUNTS PAYABLE (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Trade accounts payable    
Trade accounts payable R$ 2,376,459 R$ 632,565
Klabin S.A.    
Trade accounts payable    
Payment Period 360 days  
Pulp | Klabin S.A.    
Trade accounts payable    
Trade accounts payable R$ 936,887  
Domestic    
Trade accounts payable    
Related party (Companies of the Suzano group) 2,478 1,804
Trade accounts payable 1,288,774 558,041
Foreign    
Trade accounts payable    
Trade accounts payable R$ 1,085,207 R$ 72,720