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Income tax - Income tax rates (Details) - MXN ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax
Corporate income tax rate	30.00%	30.00%	30.00%
Employee wages and benefits tax deductible (as a percent)	47.00%
Withholding tax on dividends distributions (as a percent)	10.00%
Consolidated basis tax income	$ 302,029	$ 938,304	$ 777,513
Maximum
Income tax
Employee wages and benefits tax deductible (as a percent)	53.00%
Guatemala
Income tax
Corporate income tax rate	25.00%	25.00%	25.00%
Costa Rica
Income tax
Corporate income tax rate	30.00%	30.00%	30.00%
Period in which tax losses can be carried forward	3 years
El Salvador
Income tax
Corporate income tax rate	30.00%	30.00%	30.00%
Mexico
Income tax
Period in which tax losses can be carried forward	10 years

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
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-URIDate 2020-01-01

+ Details

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- Definition

Amount of consolidated basis tax income (loss) during the period.

+ References

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- Definition

Amount of wages and benefits paid to employees tax deductible for employers.

+ References

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- Definition

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+ References

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- Definition

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+ References

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