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FAIR VALUE (Tables) | 12 Months Ended
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Feb. 28, 2022
FAIR VALUE |
Schedule of inputs for fair value measurements of assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurement at Reporting Date Using
​ | ​ | ​ | ​ | ​ | Quoted Prices in | ​ | Significant Other | ​ | Significant
​ | ​ | February 28, | ​ | Active Market for | ​ | Observable | ​ | Unobservable
Description |  | 2021 |  | Identical Assets |  | Inputs |  | Inputs
​ | ​ | ​ |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Variable-rate financial instruments | ​ | $ | 457,723 |  | ​ | — | ​ | $ | 457,723 |  | ​ | —
Available-for-sale investments | ​ | $ | 308,970 |  | ​ | — | ​ | $ | 308,970 |  | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ |  | ​ |  |  |  | ​ |
Equity securities with readily determinable fair values | ​ | $ | 23,467 | ​ | $ | 23,467 | ​ |  | — | ​ | ​ | —
Fair value option investment | ​ | $ | 7,661 | ​ |  | — | ​ |  | — | ​ | $ | 7,661
Available-for-sale investments | ​ | $ | 361,788 | ​ |  | — | ​ |  | — | ​ | $ | 361,788
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 1,159,609 | ​ | $ | 23,467 | ​ | $ | 766,693 | ​ | $ | 369,449
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurement at Reporting Date Using
​ | ​ | ​ | ​ | ​ | Quoted Prices in | ​ | Significant Other | ​ | Significant
​ | ​ | February 28, | ​ | Active Market for | ​ | Observable | ​ | Unobservable
Description |  | 2022 |  | Identical Assets |  | Inputs |  | Inputs
​ | ​ | ​ |  | (Level 1) |  | (Level 2) |  | (Level 3)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term investments |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Variable-rate financial instruments | ​ | $ | 150,000 |  | ​ | — | ​ | $ | 150,000 |  | ​ | —
Available-for-sale investments | ​ | $ | 340,183 | ​ | ​ | — | ​ | $ | 340,183 | ​ | ​ | —
Long-term investments | ​ | ​ | ​ | ​ | ​ |  | ​ |  |  |  | ​ |
Equity securities with readily determinable fair values | ​ | $ | 16,723 | ​ | $ | 14,606 | ​ | $ | 2,117 |  | ​ | —
Fair value option investment | ​ | $ | 17,735 | ​ |  | — | ​ | $ | 17,419 | ​ | $ | 316
Available-for-sale investments | ​ | $ | 134,033 | ​ |  | — | ​ |  | — | ​ | $ | 134,033
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | $ | 658,674 | ​ | $ | 14,606 | ​ | $ | 509,719 | ​ | $ | 134,349
Schedule of roll forward of Level 3 instruments | ​
​ | ​ | ​ | ​
​ |  | US$
​ | ​ | ​ | ​
Balance as of February 29, 2020 | ​ | $ | 310,842
Purchase | ​ |  | 20,349
Transfer in due to reclassification | ​ |  | 22,579
Changes in fair value | ​ |  | 19,145
Impairment loss | ​ |  | (10,029)
Foreign exchange difference | ​ |  | 6,563
​ | ​ | ​ | ​
Balance as of February 28, 2021 | ​ | $ | 369,449
Purchase | ​ | ​ | 13,616
Disposal | ​ |  | (2,219)
Changes in fair value | ​ |  | (41,698)
Impairment loss | ​ |  | (204,807)
Foreign exchange difference | ​ |  | 8
​ | ​ | ​ | ​
Balance as of February 28, 2022 | ​ | $ | 134,349

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- Definition Tabular disclosure of changes in the carrying amounts of long-term investments accounted for available-for-sales securities on a recurring basis. + References No definition available. + Details
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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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