SHORT-TERM INVESTMENTS - Schedule of Short-Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	$ 1,134,699	$ 1,307,895
Gross Unrealized Gains	739	1,053
Gross Unrealized Losses	(250)	(256)
Fair Value	1,135,188	1,308,692
Bank-time deposits
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	266,869	578,762
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	266,869	578,762
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	661,327	520,486
Gross Unrealized Gains	713	994
Gross Unrealized Losses	(250)	(256)
Fair Value	661,790	521,224
US Treasuries
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	55,463	60,029
Gross Unrealized Gains	26	57
Gross Unrealized Losses	0	0
Fair Value	55,489	60,086
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	229	469
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	229	470
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	150,811	148,149
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	$ 150,811	$ 148,150

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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