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

The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

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

The weighted average share price. [Refer: Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_c&doctype=Standard
-URIDate 2019-03-27

Name:	ifrs-full_WeightedAverageSharePrice2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in non-option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

No definition available.

Name:	jmia_DescriptionOfExpectedVolatilityOtherThanOptionsGranted
Namespace Prefix:	jmia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The life of non-option equity instruments granted.

No definition available.

Name:	jmia_DescriptionOfOtherThanOptionLifeGranted
Namespace Prefix:	jmia_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for the non-option equity instrument is expressed, with a remaining term equal to the expected term of the instrument being valued (based on its remaining contractual life and taking into account the effects of expected early exercise)

No definition available.

Name:	jmia_DescriptionOfRiskFreeInterestRateOtherEquityInstrumentsGranted
Namespace Prefix:	jmia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of an expected dividend used to calculate the fair value of non-option equity instruments granted.

No definition available.

Name:	jmia_ExpectedDividendAsPercentageOtherThanOptionsGranted
Namespace Prefix:	jmia_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=jmia_RestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=jmia_RestrictedStockUnitsWithGrantDateMay82019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=jmia_RestrictedStockUnitsWithGrantDateMay102019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: