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Schedule of marketable securities (Details) - BRL (R$)
R$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
IfrsStatementLineItems [Line Items]      
Financial assets at fair value through other comprehensive income [1]   R$ 13,338 R$ 42,029
Financial assets at fair value through profit or loss   362,293 329,202
[custom:AmortizedCost-0]   794,268 658,735
Current financial assets   346,855 314,158
Non-current financial assets [2]   447,413 344,577
Stocks [Member] | Financial assets available-for-sale, category [member]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency [1] USD    
Stocks [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency [1] HKD    
Financial Treasury Bills [Member]      
IfrsStatementLineItems [Line Items]      
Financial assets at fair value through profit or loss   R$ 324,771 312,515
Financial Treasury Bills [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency R$    
WAM [3]   2 years 9 months 14 days  
Financial treasury bills interest rate [4]   9.10%  
Investment Funds F I D C B R F [Member]      
IfrsStatementLineItems [Line Items]      
Financial assets at fair value through profit or loss   R$ 15,438 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]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency   R$  
WAM [3]   1 year 11 months 15 days  
Other [Member]      
IfrsStatementLineItems [Line Items]      
Financial assets at fair value through profit or loss   R$ 22,084 1,643
Other [Member] | Financial assets at fair value through profit or loss, classified as held for trading, category [member]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency   R$  
WAM [3]   6 months 18 days  
Sovereign Bonds And Others [Member]      
IfrsStatementLineItems [Line Items]      
[custom:AmortizedCost-0] [5]   R$ 418,637 R$ 287,504
Sovereign Bonds And Others [Member] | Held-to-maturity investments, category [member]      
IfrsStatementLineItems [Line Items]      
Marketable securities currency [5]   AOA  
WAM [3],[5]   1 year 3 months 29 days  
Financial treasury bills interest rate [4],[5]   3.99%  
[1] It’s comprised of Aleph Farms Ltd. stocks on December 31, 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$18,630 (R$9,894 on December 31, 2020).