Provisions for liabilities and other charges - Movements in provisions (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Movements in provisions for liabilities and other charges
Balance at beginning	€ 20,218	€ 14,944
Additions	7,764	5,920
Reversal	(795)	(849)
Use of provision, net	(22)	(324)
Reclassification (Defined benefit plans)		389
Effect of translation	101	138
Balance at ending	27,266	20,218
Current provisions	27,040	19,692
Non-current provisions	226	389
Tax risks
Movements in provisions for liabilities and other charges
Balance at beginning	19,675	14,143
Additions	6,700	5,860
Reversal	(611)	(453)
Use of provision, net	(21)
Effect of translation	97	125
Balance at ending	25,840	19,675
Current provisions	25,840
Marketplace and consignment goods
Movements in provisions for liabilities and other charges
Balance at beginning	69	241
Additions	480
Reversal		(180)
Effect of translation		8
Balance at ending	549	69
Current provisions	549
Provision for other expenses
Movements in provisions for liabilities and other charges
Balance at beginning	474	560
Additions	584	60
Reversal	(184)	(216)
Use of provision, net	(1)	(324)
Reclassification (Defined benefit plans)		389
Effect of translation	4	5
Balance at ending	877	€ 474
Current provisions	651
Non-current provisions	€ 226

The amount of additional other provisions made. [Refer: Other provisions]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2019-01-01
-Paragraph 84
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_AdditionalProvisionsOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of current provisions. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph l
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_l&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CurrentProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 37
-IssueDate 2019-01-01
-Paragraph 84
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of non-current provisions. [Refer: Provisions]

+ References

+ Details

Name:	ifrs-full_NoncurrentProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2019-01-01
-Paragraph 84
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_a&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_d&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_OtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

The amount reversed for unused other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2019-01-01
-Paragraph 84
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84_d&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_UnusedProvisionReversedOtherProvisions
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of increase (decrease) in other provisions related to defined benefit plans.

+ References

No definition available.

+ Details

Name:	jmia_OtherProvisionsIncreaseDecreaseReclassificationRelatedToDefinedBenefitPlans
Namespace Prefix:	jmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net amount used (i.e., incurred and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

No definition available.

+ Details

Name:	jmia_ProvisionUsedOtherProvisionsNet
Namespace Prefix:	jmia_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=jmia_ProvisionForIncomeTaxesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=ifrs-full_RefundsProvisionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=ifrs-full_MiscellaneousOtherProvisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: