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SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 638,955 $ 617,318
Gross Unrealized Gain 35 32
Gross Unrealized Loss (1,534) (1,944)
Fair Value 637,456 615,406
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less 555,536  
Amortized cost, Due in 1-2 years 83,419  
Total amortized cost 638,955  
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 554,449  
Fair value, Due in 1-2 years 83,007  
Total fair value 637,456  
Bank-time deposits    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 246,503 216,663
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair Value 246,503 216,663
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 321,860 310,387
Gross Unrealized Gain 28 16
Gross Unrealized Loss (1,245) (1,687)
Fair Value 320,643 308,716
US Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 60,044 59,970
Gross Unrealized Gain 0 0
Gross Unrealized Loss (245) (245)
Fair Value 59,799 59,725
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 5,990 25,422
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair Value 5,990 25,422
Mutual funds    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 4,558 4,876
Gross Unrealized Gain 7 16
Gross Unrealized Loss (44) (12)
Fair Value $ 4,521 $ 4,880