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Cash and Cash Equivalents and Financial Investments - Cash and cash equivalents (Detail) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and cash equivalents and financial investments details [abstract]
Cash and bank deposits In local currency	R$ 117,231	R$ 73,128
In foreign currency	88,251	74,798
Fixed-income securities	3,722,308	4,821,605
Fixed-income securities	11,161	32,473
Total cash and cash equivalents	R$ 3,938,951	R$ 5,002,004	R$ 4,274,158	R$ 4,274,158	R$ 2,702,893

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- Definition

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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2018-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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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
-URIDate 2018-03-16

+ Details

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- Definition

The amount of cash on hand and bank deposits in foreign currency.

+ References

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+ Details

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- Definition

The amount of cash on hand and bank deposits in local currency.

+ References

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- Definition

Cash and cash equivalents and financial investments details.

+ References

No definition available.

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- Definition

Investment that provides a return in the form of fixed periodic payments and the eventual return of principal at maturity.

+ References

No definition available.

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- Definition

Investment in local currency that provides a return in the form of fixed periodic payments and the eventual return of principal at maturity.

+ References

No definition available.

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