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Derivative instruments - Coupon-only Swap (Details) - Derivatives designated as hedging instruments - Subsidiaries - Coupon-only swap - Cash Flow Hedging R$ in Thousands, $ in Thousands	Apr. 30, 2017 BRL (R$)	Apr. 30, 2017 USD ($)
Citibank S.A. | Payable
Derivative [Line Items]
Payable Amount | R$	R$ 155,500
Citibank S.A. | Receivable
Derivative [Line Items]
Interest rate	6.91%	6.91%
Receivable Amount | $		$ 50,000
JP Morgan S.A. | Payable
Derivative [Line Items]
Payable Amount | R$	R$ 156,250
JP Morgan S.A. | Receivable
Derivative [Line Items]
Interest rate	6.91%	6.91%
Receivable Amount | $		$ 50,000
Brazil Real | Citibank S.A. | Payable
Derivative [Line Items]
Interest rate	11.08%	11.08%
Brazil Real | JP Morgan S.A. | Payable
Derivative [Line Items]
Interest rate	11.18%	11.18%

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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- Definition

Nominal or face amount used to calculate payments on the derivative liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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- Definition

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+ References

No definition available.

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