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SHARE-BASED COMPENSATION - Settlement of Liability Classified Restricted Shares (Details) - CNY (¥) ¥ in Thousands	8 Months Ended	9 Months Ended		12 Months Ended
	Oct. 31, 2020	Nov. 30, 2019	Nov. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SHARE-BASED COMPENSATION
Settlement of liability-classified restricted share award				¥ 10,089	¥ 7,984	¥ 6,357
Compensation expense				¥ 333,686	¥ 189,756	¥ 105,877
Directors
SHARE-BASED COMPENSATION
Compensation expense	¥ 0
Restricted shares
SHARE-BASED COMPENSATION
Granted (in shares)				11,710,848	14,551,472	13,202,512
Compensation expense				¥ 333,686	¥ 189,447	¥ 89,804
Restricted shares | Directors
SHARE-BASED COMPENSATION
Granted (in shares)	190,536	237,312	260,560
Settlement of liability-classified restricted share award	¥ 10,089	¥ 7,984	¥ 6,357

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Amount of liability settled during the current period with restricted shares awarded.

+ References

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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