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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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