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PRINCIPAL ACCOUNTING POLICIES - Warranty service revenue (Details) - Golden Authentication [Member] | 12 Months Ended
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Mar. 31, 2022 km
Product Warranty Liability [Line Items] |
Number of years covered by warranty program (in years) | 1 year
Number of kilometers covered by warranty program (in kilometers) | 20,000

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- 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_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Distance covered under the warranty and related obligation in contract with customer. + References No definition available. + Details
Name: | uxin_RevenuePerformanceObligationDistanceUnderWarranty
Namespace Prefix: | uxin_
Data Type: | dtr-types:lengthItemType
Balance Type: | na
Period Type: | duration

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- Definition Period of warranty and related obligation in contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | uxin_RevenuePerformanceObligationTermOfWarranty
Namespace Prefix: | uxin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=uxin_GoldenAuthenticationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |