PRINCIPAL ACCOUNTING POLICIES - Warranty service revenue (Details) - Golden Authentication [Member]	12 Months Ended
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

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.

No definition available.

Name:	uxin_RevenuePerformanceObligationTermOfWarranty
Namespace Prefix:	uxin_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration