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SHORT-TERM INVESTMENTS (Contracted Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less $ 637,405  
Amortized cost, Due in 1-2 years 103,896  
Cost or Amortized Cost 741,301 $ 743,892
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 638,236  
Fair value, Due in 1-2 years 104,377  
Total fair value $ 742,613 $ 744,485