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Other liabilities (Details Text)
R$ in Thousands
Dec. 31, 2017
BRL (R$)
Other liabilities (Details Text)  
Total non-cancellable minimum future payments due on operating leases R$ 7,923,649
Due within 1 year  
Other liabilities (Details Text)  
Total non-cancellable minimum future payments due on operating leases 832,991
Due between 1-5 years  
Other liabilities (Details Text)  
Total non-cancellable minimum future payments due on operating leases 3,325,401
Due more than 5 years  
Other liabilities (Details Text)  
Total non-cancellable minimum future payments due on operating leases R$ 3,765,257