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INVENTORIES - Changes in provision for losses (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in provision for losses    
Balance at the beginning of the year R$ (33,195) R$ (51,911)
Business combination with Fibria (11,117)  
Addition (111,077) (10,605)
Reversal 9,734 5,873
Write-off 38,942 23,448
Balance at the end of the year (106,713) (33,195)
Finished goods, estimated losses 42,470  
Raw materials, estimated losses 39,382  
Spare parts, write-off of inventory 5,786  
Raw materials, write-off of inventory 26,083  
Inventory, additional write-off recognized in the income statement 5,190 29,828
Inventories pledged as security for liabilities R$ 0 R$ 0