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17. Borrowings and financing (Details 5)
R$ in Thousands
12 Months Ended
Dec. 31, 2018
BRL (R$)
22nd issue series 1  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
Amount R$ 100,000
Maturity 3 years
Remuneration CDI + 0.58% p.a.
22nd issue series 2  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
Amount R$ 400,000
Maturity 5 years
Remuneration CDI + 0.90% p.a.
22nd issue series 3  
SummaryOfBorrowingsAndFinancingLineItems [Line Items]  
Amount R$ 250,000
Maturity 7 years
Remuneration IPCA + 6.00% p.a.