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SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost $ 563,909 $ 617,318
Gross Unrealized Gain 36 32
Gross Unrealized Loss (993) (1,944)
Fair Value 562,952 615,406
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]    
Amortized cost, Due in 1 year or less 488,070  
Amortized cost, Due in 1-2 years 75,839  
Total amortized cost 563,909  
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]    
Fair value, Due in 1 year or less 487,300  
Fair value, Due in 1-2 years 75,652  
Total fair value 562,952  
Bank-time deposits    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 183,059 216,663
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair Value 183,059 216,663
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 317,795 310,387
Gross Unrealized Gain 36 16
Gross Unrealized Loss (782) (1,687)
Fair Value 317,049 308,716
US Treasuries    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 53,516 59,970
Gross Unrealized Gain 0 0
Gross Unrealized Loss (211) (245)
Fair Value 53,305 59,725
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost 9,539 25,422
Gross Unrealized Gain 0 0
Gross Unrealized Loss 0 0
Fair Value $ 9,539 25,422
Mutual funds    
Debt Securities, Available-for-sale [Line Items]    
Cost or Amortized Cost   4,876
Gross Unrealized Gain   16
Gross Unrealized Loss   (12)
Fair Value   $ 4,880