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SHORT-TERM INVESTMENTS (Short Term Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, 1 year or less $ 496,639  
Amortized Cost, 1-2 years 150,147  
Cost or Amortized Cost 646,786 $ 743,892
Fair Value, 1 year or less 495,645  
Fair Value, 1-2 years 148,358  
Total short-term investments $ 644,003 $ 744,485