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Long-term debt (Debt Repurchases) (Details) - 2016 Notes R$ in Thousands, $ in Thousands													8 Months Ended
	Jul. 13, 2016 BRL (R$)	Jul. 13, 2016 USD ($)	May 05, 2016 BRL (R$)	May 05, 2016 USD ($)	Apr. 21, 2016 BRL (R$)	Apr. 21, 2016 USD ($)	Jan. 29, 2016 BRL (R$)	Jan. 29, 2016 USD ($)	Nov. 30, 2015 BRL (R$)	Nov. 30, 2015 USD ($)	Nov. 25, 2015 BRL (R$)	Nov. 25, 2015 USD ($)	Jul. 13, 2016 BRL (R$)	Jul. 13, 2016 USD ($)
Debt Instrument [Line Items]
Redemption price (as a percent)	100.00%	100.00%	97.00%	97.00%	100.00%	100.00%	97.75%	97.75%	93.75%	93.75%	93.75%	93.75%
Redemption amount	R$ 200,991	$ 60,965	R$ 4,025	$ 1,106	R$ 421,765	$ 118,797	R$ 1,180	$ 288	R$ 7,039	$ 1,715	R$ 40,000	$ 9,995	R$ 675,000	$ 192,866

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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