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SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Feb. 28, 2022
Feb. 28, 2021
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