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SIGNIFICANT ACCOUNTING POLICIES - Additional information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2017 | Nov. 30, 2016 | May 31, 2016 | Jun. 30, 2015 | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($) | Feb. 29, 2020 USD ($) | Feb. 28, 2022 CNY (¥) | Feb. 28, 2021 CNY (¥)
Contract liabilities of deferred revenue |  |  |  |  | $ 187,732 | $ 1,417,498 |  |  |
VAT (as a percent) | 13.00% |  |  |  |  |  |  |  |
Advertising costs |  |  |  |  | 222,115 | 803,120 | $ 248,807 |  |
Foreign currency translation, exchange gain (loss) |  |  |  |  | (3,640) | (12,311) | $ 968 |  |
Cash and cash equivalents |  |  |  |  | 1,638,189 | $ 3,242,953 |  | ¥ 1,180,475 | ¥ 1,754,509
Debt securities, held-to-maturity, allowance for credit loss |  |  |  |  | $ 0 |  |  |  |
Xinxin Xiangrong. |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  |  | 6.00% |  |  |  |  |
Beijing Xintang Sichuang, TAL Beijing, Yidu Huida | Xueersi Education. |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  |  |  | 6.00% |  |  |  |
Zhixuesi Beijing |  |  |  |  |  |  |  |  |
VAT (as a percent) |  | 6.00% |  |  |  |  |  |  |
Pengxin TAL |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  | 6.00% |  |  |  |  |  |
Yizhen Xuesi. |  |  |  |  |  |  |  |  |
VAT (as a percent) |  | 6.00% |  |  |  |  |  |  |
Online education services through www.xueersi.com |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  |  |  | 6.00% |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  |  |  | 3.00% |  |  |  |
Minimum | Investees |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  | 20.00% |  |  | 20.00% |
Maximum |  |  |  |  |  |  |  |  |
VAT (as a percent) |  |  |  |  | 13.00% |  |  |  |
Maximum | Investees |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  |  | 50.00% |  |  | 50.00% |

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