Significant accounting estimates, judgments and assumptions in applying accounting policies (Details)	12 Months Ended
Dec. 31, 2019
Significant accounting estimates, judgments and assumptions in applying accounting policies
Period for which the company used historic credit loss experience	2 years

Represents the period for which the company used historical credit loss experience.

No definition available.

Name:	jmia_PeriodForWhichCompanyUsedHistoricalCreditLossExperience
Namespace Prefix:	jmia_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration