PRINCIPAL ACCOUNTING POLICIES - VIE Arrangements (Details) - Dada Glory - Shanghai Qusheng Internet Technology Co. Ltd	12 Months Ended
Dec. 31, 2020
Variable Interest Entity [Line Items]
Percentage of equity interests pledged by the shareholders of VIE	100.00%
Percentage of net income generated by the VIE payable as monthly service fees	100.00%
Initial term of the Exclusive Business Cooperation Agreement	10 years
Initial term of the Exclusive Option Agreement	10 years

- Definition

Initial term of the Exclusive Business Cooperation Agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	dada_ExclusiveBusinessCooperationAgreementInitialTerm
Namespace Prefix:	dada_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Initial term of the Exclusive Option Agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	dada_ExclusiveOptionAgreementInitialTerm
Namespace Prefix:	dada_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of equity interests pledged by shareholders of Variable Interest Entities (VIE), pursuant to Share Pledge Agreements.

+ References

No definition available.

+ Details

Name:	dada_PercentageOfEquityInterestsPledgedByShareholdersOfVariableInterestEntities
Namespace Prefix:	dada_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of net income generated by the Variable Interest Entity (VIE) payable on a monthly basis as service fees, pursuant to Exclusive Business Cooperation Agreement.

+ References

No definition available.

+ Details

Name:	dada_PercentageOfNetIncomeGeneratedByVariableInterestEntityPayableAsMonthlyServiceFees
Namespace Prefix:	dada_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_VariableInterestEntityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_ConsolidatedEntitiesAxis=dada_DadaGloryNetworkTechnologyShanghaiCo.LtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=dada_ShanghaiQushengInternetTechnologyCo.LtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: