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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] |  |
Nominal Amount |  | $ 30,000
Call spread | JP Morgan S.A. | Payable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 5.62 | 5.62
Call spread | JP Morgan S.A. | Receivable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 8.20 | 8.20
Call spread | Itaú |  |
Derivative [Line Items] |  |
Nominal Amount |  | $ 50,000
Call spread | Itaú | Payable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 5.62 | 5.62
Call spread | Itaú | Receivable |  |
Derivative [Line Items] |  |
Strike price (in usd per option) | $ / option | 8.20 | 8.20
Coupon-only swap | JP Morgan S.A. | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 168,690 |
Coupon-only swap | JP Morgan S.A. | Payable | CDI, Certificados de Depósitos Interbancários |  |
Derivative [Line Items] |  |
Interest rate | 2.42% | 2.42%
Coupon-only swap | JP Morgan S.A. | Receivable |  |
Derivative [Line Items] |  |
Nominal Amount |  | $ 30,000
Interest rate | 5.46% | 5.46%
Coupon-only swap | Itaú | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 281,150 |
Coupon-only swap | Itaú | Payable | CDI, Certificados de Depósitos Interbancários |  |
Derivative [Line Items] |  |
Interest rate | 2.47% | 2.47%
Coupon-only swap | Itaú | Receivable |  |
Derivative [Line Items] |  |
Nominal Amount |  | $ 50,000
Interest rate | 5.46% | 5.46%
Sustainability-linked ESG Principal Only Swap | Citibank S.A. | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 155,500 |
Interest rate | 0.88% | 0.88%
Sustainability-linked ESG Principal Only Swap | Citibank S.A. | Receivable |  |
Derivative [Line Items] |  |
Nominal Amount |  | $ 50,000

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