RELATED PARTY TRANSACTIONS - Debentures (Details) - Direct or indirect shareholders R$ in Thousands	Dec. 31, 2017 BRL (R$) instrument	Dec. 31, 2016 BRL (R$) instrument
RELATED PARTY TRANSACTIONS
Debentures held \| R$	R$ 348	R$ 33,438
Number of debentures held \| instrument	63	5,964

The amount of instruments representing indebtedness held by the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard
-URIDate 2017-03-09

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