Share-Based Compensation Plans - Measurement assumptions (Details)	12 Months Ended
Dec. 31, 2018 BRL (R$) item
Share-Based Compensation Plans
Number of observations of returns \| item	745
Common stock option plan \| Program 3
Share-Based Compensation Plans
Calculation model	Binomial
Asset base price (per share)	R$ 7.73
Expectation of volatility	40.47%
Dividends expectancy	3.49%
Risk-free weighted average interest rate	8.99%
PSO \| Minimum
Share-Based Compensation Plans
Total shareholder return	75.00%
PSO \| Maximum
Share-Based Compensation Plans
Total shareholder return	125.00%
PSO \| SAR 2015
Share-Based Compensation Plans
Calculation model	Monte Carlo
Asset base price (per share)	R$ 42.46
Expectation of volatility	44.36%
Dividends expectancy	1.00%
Risk-free weighted average interest rate	8.72%
PSO \| SAR 2016 and PLUS 2016
Share-Based Compensation Plans
Calculation model	Monte Carlo
Asset base price (per share)	R$ 42.46
Expectation of volatility	44.36%
Dividends expectancy	1.00%
Risk-free weighted average interest rate	8.72%
PSO \| SAR 2017 and PLUS 2017
Share-Based Compensation Plans
Calculation model	Monte Carlo
Asset base price (per share)	R$ 42.46
Expectation of volatility	44.36%
Dividends expectancy	1.00%
Risk-free weighted average interest rate	8.72%
PSO \| SAR 2018 and Plus 2018
Share-Based Compensation Plans
Calculation model	Monte Carlo
Asset base price (per share)	R$ 42.46
Expectation of volatility	44.36%
Dividends expectancy	1.00%
Risk-free weighted average interest rate	8.72%

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph a
-Clause i
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-URIDate 2018-03-16

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- Definition

The description of the option pricing model used for share options granted. [Refer: Option pricing model [member]]

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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- Definition

The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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The number of observations of returns used as standard deviation in the calculation of volatility.

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A measurement of performance of the Company's stock, expressed as a percentage.

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