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5 Risk management (Details)
¥ in Thousands, R$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
BRL (R$)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
JPY (¥)
Dec. 31, 2019
BRL (R$)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Summary of risk management [Line Items]            
Total exposure R$ 3,563,170     R$ 6,382,009    
Total foreign currency-denominated borrowings 3,547,862     6,358,798    
USD            
Summary of risk management [Line Items]            
Borrowings and financing 870,338     4,239,817    
Interest and charges from borrowings and financing 5,540     32,242    
Borrowing cost (12,342)     (20,173)    
USD | Foreign currency [member]            
Summary of risk management [Line Items]            
Borrowings and financing | $   $ 167,479     $ 1,051,881  
Yen            
Summary of risk management [Line Items]            
Borrowings and financing 2,671,255     2,097,225    
Interest and charges from borrowings and financing 16,037     12,725    
Borrowing cost R$ (2,966)     R$ (3,038)    
Yen | Foreign currency [member]            
Summary of risk management [Line Items]            
Borrowings and financing | ¥     ¥ 52,969,560     ¥ 56,452,885