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Derivative instruments - Coupon-only Swap (Details) - Subsidiaries - Cash Flow Hedging R$ in Thousands, $ in Thousands | Apr. 30, 2017 BRL (R$) | Apr. 30, 2017 USD ($)
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Derivatives designated as hedging instruments | Citibank S.A. | Coupon-only swap | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 155,500 |
Derivatives designated as hedging instruments | Citibank S.A. | Coupon-only swap | Receivable |  |
Derivative [Line Items] |  |
Interest rate | 6.91% | 6.91%
Receivable amount | $ |  | $ 50,000
Derivatives designated as hedging instruments | Citibank S.A. | Coupon-only swap | Brazil Real | Payable |  |
Derivative [Line Items] |  |
Interest rate | 11.08% | 11.08%
Derivatives designated as hedging instruments | JP Morgan S.A. | Coupon-only swap | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 156,250 |
Derivatives designated as hedging instruments | JP Morgan S.A. | Coupon-only swap | Receivable |  |
Derivative [Line Items] |  |
Interest rate | 6.91% | 6.91%
Receivable amount | $ |  | $ 50,000
Derivatives designated as hedging instruments | JP Morgan S.A. | Coupon-only swap | Brazil Real | Payable |  |
Derivative [Line Items] |  |
Interest rate | 11.18% | 11.18%
Derivatives not designated as hedging instruments | Citibank S.A. | Sustainability-linked ESG Principal Only Swap | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 155,500 |
Interest rate | 0.88% | 0.88%
Derivatives not designated as hedging instruments | Citibank S.A. | Sustainability-linked ESG Principal Only Swap | Receivable |  |
Derivative [Line Items] |  |
Receivable amount | $ |  | $ 50,000
Derivatives not designated as hedging instruments | JP Morgan S.A. | Coupon-only swap | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 168,690 |
Derivatives not designated as hedging instruments | JP Morgan S.A. | Coupon-only swap | Receivable |  |
Derivative [Line Items] |  |
Interest rate | 5.46% | 5.46%
Receivable amount | $ |  | $ 30,000
Derivatives not designated as hedging instruments | Itaú | Coupon-only swap | Payable |  |
Derivative [Line Items] |  |
Payable amount | R$ | R$ 281,150 |
Derivatives not designated as hedging instruments | Itaú | Coupon-only swap | Receivable |  |
Derivative [Line Items] |  |
Interest rate | 5.46% | 5.46%
Receivable amount | $ |  | $ 50,000

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