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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Treasury shares (Details)	Dec. 30, 2022 $ / ¥
Translation into United States Dollars
Foreign exchange rate used to translate amounts denominated in RMB to US dollar	6.8972

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32618-110901

+ Details

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Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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