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SHORT-TERM INVESTMENTS (Contracted Maturities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less $ 468,915  
Amortized cost, Due in 1-2 years 87,422  
Cost or Amortized Cost 556,337 $ 743,892
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 469,523  
Fair value, Due in 1-2 years 88,130  
Total fair value $ 557,653 $ 744,485