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18 Earnings per share (EPS) (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
[1]
Dec. 31, 2017
[1]
Numerator      
Net income attributable to equity holders of the parent R$ 153,916 R$ 86,353 R$ 45,393
Denominator      
Weighted average number of outstanding shares 75,969,797 46,936,064 32,188,884
Effects of dilution from stock options 221,846 840,700
Weighted average number of outstanding shares adjusted for the effect of dilution 76,191,643 47,776,764 32,188,884
Basic earnings per share (R$) R$ 2.03 R$ 1.84 R$ 1.41
Diluted earnings per share (R$) R$ 2.02 R$ 1.81 R$ 1.41
[1] Considers the effects from 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.