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Schedule of marketable securities (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through other comprehensive income [1] R$ 13,290 R$ 42,029
WAM 2 years  
Fair value through profit and loss R$ 358,148 329,202
Amortized cost 719,088 658,735
Current 343,182 314,158
Non-current [2] R$ 375,906 344,577
Stocks [Member] | Financial assets available-for-sale, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency [1] USD  
Stocks [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency [1] HKD  
Financial Treasury Bills [Member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss R$ 318,893 312,515
Financial Treasury Bills [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency R$  
WAM [3] 3 years 3 months 15 days  
Average interest rate (p.a.) [4] 1.90%  
Investment Funds F I D C B R F [Member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss R$ 14,966 15,044
Investment Funds F I D C B R F [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency R$  
WAM [3] 2 years 5 months 16 days  
Committed [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss R$ 22,810  
Committed [member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency R$  
WAM [3] 6 months  
Other [Member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Fair value through profit and loss R$ 1,479 1,643
Other [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency R$ / ARS  
WAM [3] 7 days  
Sovereign bonds and others [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Amortized cost [5] R$ 347,650 R$ 287,504
Sovereign bonds and others [member] | Held-to-maturity investments, category [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Currency [5] AOA  
WAM [3],[5] 1 year 6 months 25 days  
Average interest rate (p.a.) [4],[5] 4.00%  
[1] It’s comprised of Aleph Farms Ltd. stocks on September 30, 2021 and Cofco Meats stocks on December 31, 2020.
[2] Maturity until December of 2023.
[3] Weighted average maturity in years.
[4] Weighted average annual rate.
[5] It’s comprised of private securities and sovereign securities of the Angola Government and are presented net of expected credit losses in the amount of R$17,943 (R$9,894 on December 31, 2020).