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Employee benefits - Sensitivity analysis (Details) $ in Thousands	Dec. 31, 2021 MXN ($)
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in actuarial assumption	0.50%
Decrease in actuarial assumption	0.50%
Increase/(decrease) in defined benefit obligation, assuming increase in actuarial assumption	$ 78,054
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption	$ 85,856
Salary increase rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in actuarial assumption	0.50%
Decrease in actuarial assumption	0.50%
Increase/(decrease) in defined benefit obligation, assuming increase in actuarial assumption	$ 82,294
Increase/(decrease) in defined benefit obligation, assuming decrease in actuarial assumption	$ 81,164

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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