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SHORT-TERM INVESTMENTS - Contracted Maturities of Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less $ 573,013  
Amortized cost, Due in 1-2 years 197,361  
Amortized cost, Due in 2 - 3 years 696  
Cost or Amortized Cost 771,070 $ 646,786
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 574,084  
Fair value, Due in 1-2 years 197,900  
Fair value, Due in 2 - 3 years 699  
Total fair value $ 772,683 $ 644,003