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Derivative instruments (Coupon-only Swap) (Details) - Subsidiaries - Coupon-only swap - Cash Flow Hedging
R$ in Thousands, $ in Thousands
Apr. 30, 2017
USD ($)
Apr. 30, 2017
BRL (R$)
Citibank S.A. | Payable    
Derivative [Line Items]    
Payable Amount | R$   R$ 155,500
Citibank S.A. | Receivable    
Derivative [Line Items]    
Receivable Amount | $ $ 50,000  
Interest rate 6.91% 6.91%
JP Morgan S.A. | Payable    
Derivative [Line Items]    
Payable Amount | R$   R$ 156,250
JP Morgan S.A. | Receivable    
Derivative [Line Items]    
Receivable Amount | $ $ 50,000  
Interest rate 6.91% 6.91%
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%