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7 Trade receivables (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross R$ 342,924 R$ 150,003
(-) Allowance for doubtful accounts (32,980) (14,763)
Trade receivables, net 309,944 135,240
Current 302,317 125,439
Non-current 7,627 9,801
Tuition Fees [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 195,318 80,156
Others [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 10,476 5,005
FIES [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 49,425 17,789
Educational Content [member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross [1] 62,931 37,154
Educational credits [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross 11,248 9,899
Mobile app subscription [Member]    
TradeAndOtherReceivablesLineItems [Line Items]    
Trade receivables, gross [2] R$ 13,526
[1] Related to trade receivables from sales of printed books, e-books and medical courses through digital platform from Medcel.
[2] Related to trade receivables from mobile applications subscriptions for digital medical content.