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GUARANTEE LIABILITIES - Movement of CECL Liabilities (Details) ¥ in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020 CNY (¥)	Mar. 31, 2022 CNY (¥)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 CNY (¥)	Mar. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Beginning balance of the period		¥ 2,441
Provision for/(reversal of) credit losses		(94)		¥ (29,272)	¥ (1,039,367)	¥ (255,105)
Ending balance of the period		179	$ 28	2,441
Guarantee liabilities - contingent
Beginning balance of the period		2,269		702,952
Guarantee liabilities settled	¥ (326,204)			(68,578)
Guarantee liabilities released to Webank				(630,733)
Provision for/(reversal of) credit losses	804,322	(2,136)		(1,372)
Ending balance of the period	702,952	¥ 133		¥ 2,269	702,952
Guarantee liabilities - contingent | ASU 2016-13
Changes on initial application of ASU 2016-13	¥ 224,834				¥ 224,834

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

+ Details

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

X

- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(11))
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This represents effect of new accounting standard on current expected credit loss liabilities relating to financial guarantees.

+ References

No definition available.

+ Details

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Namespace Prefix:	uxin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of decrease due to release of the guarantee obligation.

+ References

No definition available.

+ Details

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Namespace Prefix:	uxin_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This represents increase (decrease) in current expected credit losses for guarantee obligations settled during the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: