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15 Labor and social obligations (Details 2)
 12 Months Ended
Dec. 31, 2020
Number
$ / shares
Dec. 31, 2019
Number
$ / shares
Dec. 31, 2018
Number
Dec. 31, 2017
Number
Number of stock options        
Outstanding at the beginning [1]     1,291,248
Granted [1]   293,860 1,434,720  
Forfeited [1]    
Exercised [1]   (1,842,428) (143,472)  
Expired [1]    
Outstanding at the ending [1]     1,291,248
Weighted average exercise price        
Outstanding at the beginning | $ / shares $ 74.53      
Granted | $ / shares 94.55      
Forfeited | $ / shares 74.57      
Exercised | $ / shares 96.20      
Outstanding at the ending | $ / shares $ 78.22 $ 74.53    
Stock option [member]        
Number of stock options        
Outstanding at the beginning 2,510,983 2,364,214  
Granted 477,220 2,364,214    
Forfeited (274,359)    
Exercised (56,092)    
Expired    
Outstanding at the ending 2,510,983 2,364,214  
[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.