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Derivative instruments - Coupon-only Swap (Details) - Subsidiaries - Cash Flow Hedging
R$ in Thousands, $ in Thousands
Apr. 30, 2017
BRL (R$)
Apr. 30, 2017
USD ($)
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