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SHORT-TERM INVESTMENTS - Contracted Maturities of Short-Term Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less $ 1,214,757  
Amortized cost, Due in 1-2 years 265,802  
Cost or Amortized Cost 1,480,559 $ 1,307,895
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 1,214,427  
Fair value, Due in 1-2 years 264,586  
Total fair value $ 1,479,013 $ 1,308,692