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Balances and Transactions with Related Parties and Affiliated Companies - Summary of Balances and Transactions with Related Parties and Affiliated Companies (Parenthetical) (Detail)		1 Months Ended
	May 22, 2018	May 22, 2018
Cafe Del Pacifico SAPI De CV Caffenio [member]
Disclosure of balances and transactions with related parties and affiliates [Line Items]
Non-controlling interest rate	10.00%	10.00%

X

- Definition

Line Items abstract of balances and transactions with related parties and affiliates.

+ References

No definition available.

+ Details

Name:	fmx_DisclosureOfBalancesAndTransactionsWithRelatedPartiesAndAffiliatesLineItems
Namespace Prefix:	fmx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2018-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_BusinessCombinationsAxis=fmx_CafeDelPacificoSAPIDeCVCaffenioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: