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Schedule of trade accounts receivable, net and notes receivable (Details) - BRL (R$)
R$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Trade accounts receivable gross R$ 4,196,878 R$ 4,719,137
Adjustment to present value (10,867) (13,316)
Expected credit losses (633,850) (605,940)
Trade receivable total 3,552,161 4,099,881
Current trade receivables 3,586,751 4,136,421
Non-current trade receivables R$ 41,886 49,864
Weighted average maturity 2 years  
Other Receivables [Member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
Trade accounts receivable gross R$ 93,844 113,949
Adjustment to present value (1,409) (156)
Expected credit losses (15,959) (27,389)
Trade receivable total 76,476 86,404
Current trade receivables 40,991 43,566
Non-current trade receivables [1] 35,485 42,838
Country of domicile [member] | Trade receivables [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
[custom:TradeAndOtherReceivablesDueFromCustomers-0] 977,964 2,002,586
Foreign countries [member] | Trade receivables [member]    
DisclosureOfMarketableSecuritiesLineItems [Line Items]    
[custom:TradeAndOtherReceivablesDueFromCustomers-0] R$ 3,218,914 R$ 2,716,551
[1] Weighted average maturity of 2.00 years.