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FAIR VALUE (Details) - USD ($)
$ in Thousands
Feb. 28, 2022
Feb. 28, 2021
Short-term investments    
Variable-rate financial instruments $ 150,000 $ 457,723
Available-for-sale investments 340,183 308,970
Fair Value, Measurements, Recurring    
Short-term investments    
Variable-rate financial instruments 150,000 457,723
Available-for-sale investments 340,183 308,970
Long-term investments    
Equity securities with readily determinable fair values 16,723 23,467
Fair value option investment 17,735 7,661
Available-for-sale investments 134,033 361,788
Total 658,674 1,159,609
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Long-term investments    
Equity securities with readily determinable fair values 14,606 23,467
Total 14,606 23,467
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Short-term investments    
Variable-rate financial instruments 150,000 457,723
Available-for-sale investments 340,183 308,970
Long-term investments    
Equity securities with readily determinable fair values 2,117  
Fair value option investment 17,419  
Total 509,719 766,693
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Long-term investments    
Fair value option investment 316 7,661
Available-for-sale investments 134,033 361,788
Total $ 134,349 $ 369,449