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Basis of Preparation - Additional Information (Detail) - $ / $	Sep. 26, 2019	Jun. 30, 2019
Disclosure of detailed information about investment property [line items]
Conversion rate of Mexican pesos to U.S. dollars		19.2089
Changes in foreign exchange rates [member]
Disclosure of detailed information about investment property [line items]
Conversion rate of Mexican pesos to U.S. dollars	19.4587
Increase decrease in foreign currency exchange rate	1.00%

X

- Definition

Increase decrease in foreign currency exchange rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: