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Technology and content expense (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Technology and content expense |  |  |
Employee benefits expense - Technology and content | € 13,251 | € 13,136 | € 11,691
IT maintenance and infrastructure expense | 14,593 | 14,136 | 10,741
Technology and content expense | € 27,844 | € 27,272 | € 22,432

X
- Definition The amount of wages and benefits, for employees involved in application, production, maintenance, operation for new and existing goods and services. + References No definition available. + Details
Name: | jmia_EmployeeBenefitExpenseRelatingToTechnologyAndContentResearchAndDevelopment
Namespace Prefix: | jmia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of information technology maintenance and infrastructure expense incurred during the period. + References No definition available. + Details
Name: | jmia_ItMaintenanceAndInfrastructureExpense
Namespace Prefix: | jmia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Technology and content expenses consist principally of research and development activities, including wages and benefits, for employees involved in application, production, maintenance, operation for new and existing goods and services, as well as other technology infrastructure expense. + References No definition available. + Details
Name: | jmia_TechnologyAndContentExpense
Namespace Prefix: | jmia_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | jmia_TechnologyAndContentExpenseAbstract
Namespace Prefix: | jmia_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration