Summary of significant accounting policies - Consolidation (Details) - subsidiary	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary of significant accounting policies
Number of subsidiaries consolidated	66	71	78

Represents the number of subsidiaries consolidated.

No definition available.

Name:	jmia_NumberOfSubsidiariesConsolidated
Namespace Prefix:	jmia_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration