PRINCIPAL ACCOUNTING POLICIES - Provision for credit losses sensitivity analysis (Details) - Credit loss of Loan recognized as a result of payment under the guarantee ¥ in Thousands	12 Months Ended
Mar. 31, 2022 CNY (¥)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Basis Point Change, favorable (as a percent)	100.00%
Increase/(Decrease), favorable	¥ 1,312
Increase/(Decrease), adverse	¥ (3,790)

The hypothetical financial impact of a 10 percent adverse change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

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

- Definition

The hypothetical financial of a 10 percent favorable change of the expected credit losses, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	uxin_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The hypothetical financial impact of a 10 percent favorable change of the payback period, including expected static pool losses, on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	uxin_SensitivityAnalysisOfFairValueTransferorSInterestsInTransferredFinancialAssetsImpactOf10PercentFavorableChangeInExpectedCreditLosses
Namespace Prefix:	uxin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: