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Derivative instruments - Call Spread and Coupon Only Swap (Details) - Apr. 30, 2017 - Subsidiaries - Cash Flow hedge - Derivatives not designated as hedging instruments R$ in Thousands, $ in Thousands | BRL (R$) $ / option | USD ($) $ / option
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Call spread | JP Morgan S.A. |  |
Derivative [Line Items] |  |
Notional Amount | $ |  | $ 30,000
Call spread | JP Morgan S.A. | Payable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 8.20 | 8.20
Call spread | JP Morgan S.A. | Receivable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 5.62 | 5.62
Coupon-only swap | JP Morgan S.A. | Payable |  |
Derivative [Line Items] |  |
Payable Amount | R$ | R$ 168,690 |
Coupon-only swap | JP Morgan S.A. | Receivable |  |
Derivative [Line Items] |  |
Notional Amount | $ |  | $ 30,000
Interest rate | 5.46% | 5.46%
Coupon-only swap | JP Morgan S.A. | Receivable | CDI, Certificados de Depósitos Interbancários |  |
Derivative [Line Items] |  |
Interest rate | 2.42% | 2.42%
Call Spread + Coupon-only swap | Itau Unibanco S.A |  |
Derivative [Line Items] |  |
Notional Amount | $ |  | $ 50,000
Call Spread + Coupon-only swap | Itau Unibanco S.A | Payable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 8.20 | 8.20
Payable Amount | R$ | R$ 281,150 |
Call Spread + Coupon-only swap | Itau Unibanco S.A | Receivable |  |
Derivative [Line Items] |  |
Notional Amount | $ |  | $ 50,000
Strike price (in usd per option) | $ / option | 5.62 | 5.62
Interest rate | 5.46% | 5.46%
Call Spread + Coupon-only swap | Itau Unibanco S.A | Receivable | CDI, Certificados de Depósitos Interbancários |  |
Derivative [Line Items] |  |
Interest rate | 2.47% | 2.47%

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