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SHORT-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Feb. 28, 2022 | Feb. 28, 2021
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SHORT-TERM INVESTMENTS |  |
Held-to-maturity investments | $ 580,352 | $ 1,927,862
Variable-rate financial instruments | 150,000 | 457,723
Available-for-sale securities | 340,183 | 308,970
Short-term investments | $ 1,070,535 | $ 2,694,555

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