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15 Labor and social obligations (Details 5)
R$ in Thousands
 1 Months Ended
Mar. 29, 2019
Number
 [1]
Feb. 07, 2019
Number
May 15, 2018
Number
Dec. 31, 2020
Number
$ / shares
Nov. 30, 2020
Number
$ / shares
Aug. 31, 2020
Number
$ / shares
Mar. 31, 2020
Number
$ / shares
Sep. 30, 2019
Number
$ / shares
Dec. 31, 2020
BRL (R$)
Nov. 30, 2020
BRL (R$)
Aug. 31, 2020
BRL (R$)
Mar. 31, 2020
BRL (R$)
Sep. 30, 2019
BRL (R$)
LaborAndSocialObligationsLineItems [Line Items]                          
Strike price at the measurement date | R$                 R$ 97 R$ 126   R$ 19 R$ 19
Dividend yield (%) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%          
Expected volatility (%) 43.70% 45.50% 49.50% 69.00%     39.70% 38.90%          
Risk-free interest rate (%) 7.20% 7.60% 7.70% 0.90%     0.80% 1.40%          
Expected life of stock options (years) | Number 4.0 4.0 4.0 1     4 5          
Share price at the measurement date | $ / shares       $ 119.78 $ 145.15 $ 136 $ 16.30 $ 21.90          
Model used Black & Scholes Monte Carlo Monte Carlo Binomial Binomial Binomial Binomial Binomial          
Weighted average fair value at the measurement date | $ / shares       $ 40.38 $ 56.43 $ 67.12 $ 3.94 $ 6.55          
Bottom of range [member]                          
LaborAndSocialObligationsLineItems [Line Items]                          
Strike price at the measurement date | R$                     R$ 74    
Expected volatility (%)         40.00% 41.00%              
Risk-free interest rate (%)         2.20% 2.20%              
Expected life of stock options (years) | Number         1 1              
Top of range [member]                          
LaborAndSocialObligationsLineItems [Line Items]                          
Strike price at the measurement date | R$                     R$ 122    
Expected volatility (%)         69.00% 75.00%              
Risk-free interest rate (%)         6.90% 6.10%              
Expected life of stock options (years) | Number         5 5              
[1] After the corporate reorganization described in Note 1, the options originally granted under the Guardayas plan granted on August 10, 2018 were remeasured at fair value and included in Afya Brazils plan with no changes to the previous terms and conditions other than the shares subject to such options granted and, consequently, the number of stock and exercise price of the shares as per the share exchange ratio applied on the corporate reorganization