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Subsequent events to the reporting date - Debentures and Senior notes (Details)
R$ in Thousands
Mar. 27, 2019
BRL (R$)
Mar. 15, 2019
BRL (R$)
Jan. 07, 2019
BRL (R$)
Feb. 25, 2019
BRL (R$)
Jan. 29, 2019
USD ($)
Jan. 29, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Events subsequent to the reporting date              
Non-convertible debentures issued             R$ 4,663,453
Borrowings transactions | BNDES              
Events subsequent to the reporting date              
Extraordinary Amortization   R$ 299,700          
Borrowings transactions | Non-convertible debentures maturing on January, 2020              
Events subsequent to the reporting date              
Non-convertible debentures issued     R$ 4,000,000        
Borrowings transactions | Non-convertible debentures maturing on January, 2020 | CDI | Minimum              
Events subsequent to the reporting date              
Percentage of basis used to calculate interest rate     103.00%        
Borrowings transactions | Non-convertible debentures maturing on January, 2020 | CDI | Maximum              
Events subsequent to the reporting date              
Percentage of basis used to calculate interest rate     112.00%        
Borrowings transactions | Senior Notes 2029              
Events subsequent to the reporting date              
Interest rate         5.465% 5.465%  
Notional amount         $ 750,000 R$ 2,800,000  
Borrowings transactions | Debenture 7th issue partial extraordinary amortization              
Events subsequent to the reporting date              
Extraordinary Amortization R$ 2,056,173            
Export prepayment agreements              
Events subsequent to the reporting date              
Export prepayment contracts       R$ 738,800      
Interest rate       8.35%