SENIOR CONVERTIBLE PREFERRED SHARES AND WARRANTS - Level 3 Investment Mainly Warrant Liabilities (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Warrant liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of Level 3 financial instruments at the beginning of the period	¥ 196,390
Issuance of warrants		¥ 647,850
Fair value of warrants and forward contracts at issuance		1,800,147
The change in fair value of financial instruments	(204,687)	(2,224,660)
Foreign currency translation	8,305	(26,947)
Fair value of Level 3 financial instruments at the end of the period	8	196,390
Forward contract assets
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value of Level 3 financial instruments at the beginning of the period	(36)
Fair value of warrants and forward contracts at issuance		735,244
Settlement of forward contracts	39,015	(287,032)
The change in fair value of financial instruments	(38,046)	(441,088)
Foreign currency translation	¥ (933)	(7,160)
Fair value of Level 3 financial instruments at the end of the period		¥ (36)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of issuances of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis fair value of warrants and forward contracts at issuance day.

+ References

No definition available.

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- Definition

Fair Value Measurement With Unobservable InputFair value measurement with unobservable inputs reconciliation recurring basis liability change in fair value.

+ References

No definition available.

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- Definition

Fair value measurement with unobservable inputs reconciliation recurring basis liability foreign currency translation.

+ References

No definition available.

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