The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph B13
-Subparagraph a
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
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-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_i&doctype=Standard
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Balance Type:	debit
Period Type:	instant

5. Cash and Cash Equivalents (Details) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
DisclosureOfCashAndCashEquivalentsLineItems [Line Items]
Cash and cash equivalents	R$ 1,948,409	R$ 1,040,075	R$ 982,073	R$ 1,480,727
Cash and Bank Accounts
DisclosureOfCashAndCashEquivalentsLineItems [Line Items]
Cash and cash equivalents	167,728	157,470
Financial Investments with Immediate Liquidity
DisclosureOfCashAndCashEquivalentsLineItems [Line Items]
Cash and cash equivalents	R$ 1,780,681	R$ 882,605