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SHORT-TERM INVESTMENTS - Contracted Maturities of Short-Term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less $ 892,200  
Amortized cost, Due in 1-2 years 242,499  
Cost or Amortized Cost 1,134,699 $ 1,307,895
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 892,781  
Fair value, Due in 1-2 years 242,407  
Total fair value $ 1,135,188 $ 1,308,692