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Derivative instruments (Coupon-only Swap) (Details) - 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]
Notional Amount | R$	R$ 155,500
Citibank S.A. | Receivable
Derivative [Line Items]
Notional Amount | $		$ 50,000
Interest rate (as a percent)	6.91%	6.91%
JP Morgan S.A. | Payable
Derivative [Line Items]
Notional Amount | R$	R$ 156,250
JP Morgan S.A. | Receivable
Derivative [Line Items]
Notional Amount | $		$ 50,000
Interest rate (as a percent)	6.91%	6.91%
Brazil Real | Citibank S.A. | Payable
Derivative [Line Items]
Interest rate (as a percent)	11.08%	11.08%
Brazil Real | JP Morgan S.A. | Payable
Derivative [Line Items]
Interest rate (as a percent)	11.18%	11.18%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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+ Details

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- Definition

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+ References

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+ Details

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