PRINCIPAL ACCOUNTING POLICIES - Intangible assets, net and Impairment of long lived assets and intangible assets with definite lives (Details)	12 Months Ended
Mar. 31, 2022
Software copyright
INTANGIBLE ASSETS, NET
Estimated useful lives (n years)	5 years

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.

No definition available.

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