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17 Borrowings and financing (Details Narrative)
R$ / shares in Units, R$ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2020
BRL (R$)
R$ / shares
May 31, 2020
USD ($)
Dec. 31, 2020
BRL (R$)
R$ / $
R$ / ¥
Sep. 30, 2020
BRL (R$)
Sep. 30, 2020
USD ($)
Jan. 31, 2020
BRL (R$)
Dec. 31, 2019
R$ / $
R$ / ¥
Disclosure of detailed information about borrowings [line items]              
Issuer's net sales and/or service revenue, percentage     25.00%        
Lease payment period     the lease payment period starts (240 monthly installments)        
17th issue debentures - series 2 [member]              
Disclosure of detailed information about borrowings [line items]              
Amortized installments amount           R$ 291,800  
25th issue debentures [member]              
Disclosure of detailed information about borrowings [line items]              
Agreement clause in case of early maturity of debt     R$ 155,000        
26th issue debentures [member]              
Disclosure of detailed information about borrowings [line items]              
Agreement clause in case of early maturity of debt     155,000        
27th issue debentures [member]              
Disclosure of detailed information about borrowings [line items]              
Agreement clause in case of early maturity of debt     R$ 160,000        
BID 2202 contract [member]              
Disclosure of detailed information about borrowings [line items]              
Exchange amount R$ 2,810,907            
Interest rate CDI + 0.86% p.a. CDI + 0.86% p.a.          
Compose the debt balance | R$ / shares R$ 5.683            
Eurobonds [member]              
Disclosure of detailed information about borrowings [line items]              
Loan amortization amount       R$ 1,910,124      
Yen              
Disclosure of detailed information about borrowings [line items]              
Exchange rate | R$ / ¥     0.05043       0.03715
USD              
Disclosure of detailed information about borrowings [line items]              
Exchange rate | R$ / $     5.1967       4.0307
USD | BID 2202 contract [member]              
Disclosure of detailed information about borrowings [line items]              
Exchange amount | $   $ 494,617          
USD | Eurobonds [member]              
Disclosure of detailed information about borrowings [line items]              
Loan amortization amount | $         $ 357,763