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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%

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