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.

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The option life of share options granted.

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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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The exercise price of share options granted.

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

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The number of share options exercised in a share-based payment arrangement.

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The cash inflow from issuing shares.

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The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]]

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The exercise multiple of share options granted.

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Share-based payments - MIP I, assumptions (Details) - MIP I		12 Months Ended
	Dec. 24, 2012 MXN ($) Y	Dec. 31, 2018 MXN ($) EquityInstruments	Dec. 31, 2017 MXN ($) EquityInstruments	Dec. 31, 2016 MXN ($) EquityInstruments
Share-based payments
Dividend yield (%)	0.00%
Volatility (%)	37.00%
Risk-free interest rate (%)	5.96%
Expected life of share options (years) \| Y	8.8
Exercise price of shares	$ 5.31
Exercise multiple	1.1
Fair value of the stock at grant date	$ 1.73
Shares exercised \| EquityInstruments		2,003,876	120,000	3,299,999
Series A shares
Share-based payments
Shares exercised \| EquityInstruments		2,003,876	120,000	3,299,999
Amount paid to Management Trust corresponding to exercised shares		$ 10,654,000	$ 638,000	$ 17,536,000