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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
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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%

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- Definition Line Items abstract of balances and transactions with related parties and affiliates. + References No definition available. + Details
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Namespace Prefix: | fmx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
Name: | ifrs-full_BusinessCombinationsAxis=fmx_CafeDelPacificoSAPIDeCVCaffenioMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |