| In R$, except when otherwise indicated | 2017 | (i) | 2016 | (i) | 2015 | (i) | |||||||||
| Fair value of options granted | 6.51 | 6.21 | 7.84 | ||||||||||||
| Share price | 19.80 | 17.18 | 18.41 | ||||||||||||
| Exercise price | 19.80 | 17.18 | 18.41 | ||||||||||||
| Expected volatility | 26.7 | % | 27.0 | % | 27.5 | % | |||||||||
| Vesting year | 5 | 5 | 5 | ||||||||||||
| Expected dividends | 5 | % | 5 | % | 5 | % | |||||||||
| Risk-free interest rate | 10.1 | % | (ii) | 12.4 | % | (ii) | 15.9 | % | (ii) | ||||||