XML 121 R105.htm IDEA: XBRL DOCUMENT
v3.19.1

Intangible Assets - Summary of Average Remaining Period for Company's Intangible Assets Subject to Amortization (Detail) | Dec. 31, 2018 yr
--- | ---
Bottom of range [member] | Technology costs and management systems [member] |
Disclosure of intangible assets material to entity [line items] |
Average Remaining Period Intangible Assets Subject to Amortization | 3
Bottom of range [member] | Alcohol licenses [member] |
Disclosure of intangible assets material to entity [line items] |
Average Remaining Period Intangible Assets Subject to Amortization | 12
Top of range [member] | Technology costs and management systems [member] |
Disclosure of intangible assets material to entity [line items] |
Average Remaining Period Intangible Assets Subject to Amortization | 10
Top of range [member] | Alcohol licenses [member] |
Disclosure of intangible assets material to entity [line items] |
Average Remaining Period Intangible Assets Subject to Amortization | 15

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

X
- Definition The remaining amortisation period of individual intangible assets that are material to the entity’s financial statements. [Refer: Depreciation and amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 122 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_122_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RemainingAmortisationPeriodOfIntangibleAssetsMaterialToEntity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=fmx_TechnologyCostsAndManagementSystemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=fmx_AlcoholLicensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |