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15 Labor and social obligations (Details Narrative)
R$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 16, 2020
BRL (R$)
Number
Nov. 26, 2020
BRL (R$)
Number
Aug. 17, 2020
BRL (R$)
Number
Jul. 29, 2020
$ / shares
Mar. 19, 2020
BRL (R$)
Number
Sep. 25, 2019
Number
Sep. 02, 2019
Number
Mar. 29, 2019
$ / shares
 [2]
Feb. 07, 2019
$ / shares
May 15, 2018
$ / shares
Dec. 31, 2020
shares
Nov. 30, 2020
Aug. 31, 2020
Mar. 31, 2020
Sep. 30, 2019
BRL (R$)
shares
Feb. 28, 2019
Jun. 30, 2018
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2020
BRL (R$)
shares
Dec. 31, 2019
BRL (R$)
Number
shares
Dec. 31, 2018
BRL (R$)
Number
shares
LaborAndSocialObligationsLineItems [Line Items]                                          
Compensation of employees                                     R$ 9,514 R$ 6,871 R$ 1,945
Number of shares issued (in share) | shares                     93,146,731             93,146,731 93,146,731 89,744,275 1,443,541
Number of stock option granted | Number [1]                                       293,860 1,434,720
Stock options granted %               0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%            
Average per option | $ / shares               $ 213.35 $ 368.41 $ 254.13                      
Model used               Black & Scholes Monte Carlo Monte Carlo Binomial Binomial Binomial Binomial Binomial            
Share based compensation plans [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Description of vesting period                               Vesting periods after the grant date: 10% after 90 days, 15% after 15 months, 25% after 27 months, 25% after 39 months and 25% after 51 months. Vesting periods after the grant date: 10% after 90 days, 15% after 12 months, 25% after 24 months, 25% after 36 months and 25% after 48 months.   Vest in five installments of 20% per year, starting on May 1.    
Share-based compensation expense                                     R$ 32,610 R$ 11,040  
Number of stock option granted | Number 5,220 115,000 127,000   230,000 58,000 2,306,213                            
Exercise price R$ 97 R$ 126     R$ 19                                
Annual installments | Number 1 5     4                                
Stock options granted %         25.00%                                
Average per option | $ / shares                                   $ 11.53      
Model used           Binomial pricing model Binomial pricing model                            
Share based compensation plans [member] | IPO [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Share-based compensation expense                                       R$ 7,074 R$ 2,161
Share based compensation plans [member] | IPO [member] | Class A common shares [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Number of shares issued (in share) | shares                             1,842,428            
Proceeds from issaunce of shares                             R$ 17,627            
Share based compensation plans [member] | Guardaya Stock Options [Member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Description of vesting period                                       Vesting periods: 10% after 1 year, 15% after 2 years, 25% after 3 years and 50% after 4 years.  
Share based compensation plans [member] | Bottom of range [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Exercise price     R$ 74                                    
Annual installments | Number     3                                    
Share based compensation plans [member] | Top of range [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Exercise price     R$ 122                                    
Annual installments | Number     5                                    
Modified plan [member]                                          
LaborAndSocialObligationsLineItems [Line Items]                                          
Stock options granted %                                     0.00%    
Average per option | $ / shares       $ 15.94                                  
Model used                                     Binomial    
[1] The number of common shares outstanding from Afya Brazil was retrospectively adjusted in the proportion of 1:28 due to the contribution of the shareholders of Afya Brazil into Afya in a one-to-28 exchange for the shares of Afya Brazil contributed to Afya, which did not result in changes on the arrangements of the plans.
[2] 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