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INVENTORIES - Changes in provision for losses (Details) - BRL (R$)
R$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Changes in provision for losses    
Balance at the beginning of the period R$ (106,713) R$ (33,195)
Business combination   (11,117)
Addition (33,653) (111,077)
Reversal 1,033 9,734
Write-off 71,351 38,942
Balance at the end of the period (67,982) (106,713)
Raw materials, estimated losses 27,326 57,384
Finished product, write-off of inventory 31,088 666
Raw materials, write-off of inventory 32,600 26,083
Inventories pledged as security for liabilities R$ 0 R$ 0