PROPERTY, PLANT AND EQUIPMENT - Impairment (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Land, buildings and construction
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	R$ 124,761	R$ 126,790
Machines, equipment, and installations
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	504,287	569,303
Property, plant and equipment under construction
PROPERTY, PLANT AND EQUIPMENT
Carrying value of impaired assets	R$ 543,726	R$ 543,726

The amount of property, plant and equipment stated at revalued amounts. [Refer: Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 77
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_77&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_PropertyPlantAndEquipmentCarryingAmountOfRevaluedAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant