Term Deposits (Details) - EUR (€) € in Thousands	Sep. 30, 2020	Dec. 31, 2019
Disclosure of financial assets [line items]
Short-term deposits in banks	€ 653	€ 62,418
Short-term deposits - others	386	0
Term deposits	€ 1,039	€ 62,418

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.

No definition available.

+ Details

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

- Definition

The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ShorttermDepositsNotClassifiedAsCashEquivalents
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of short-term deposits held in banks that are not classified as cash equivalents.

+ References

No definition available.

+ Details

Name:	jmia_ShortTermDepositsInBanks
Namespace Prefix:	jmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of short-term guarantee deposits, such as those with commercial vendors.

+ References

No definition available.

+ Details

Name:	jmia_ShortTermGuaranteeDeposits
Namespace Prefix:	jmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant