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SHARE-BASED COMPENSATION - Fair Value Assumptions - Restricted Shares (Details) - Restricted shares	1 Months Ended
	Aug. 31, 2020 $ / shares	Aug. 31, 2019 $ / shares	Aug. 31, 2018 $ / shares	Aug. 31, 2020 ¥ / shares	Aug. 31, 2019 ¥ / shares	Aug. 31, 2018 ¥ / shares
Fair value assumptions
Volatility (as a percent)	59.23%	63.22%	71.85%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%
Share price at grant date | (per share)	$ 10.1475	$ 5.02375	$ 3.125	¥ 70.5	¥ 34.6	¥ 21.3
Minimum
Fair value assumptions
Risk-free rate of return (as a percent)	0.14%	1.67%	2.047%
Expected term	1 year	1 year	1 year
Maximum
Fair value assumptions
Risk-free rate of return (as a percent)	0.19%	1.88%	2.418%
Expected term	3 years	3 years	3 years

X

- References

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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