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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 |  |  |

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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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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