Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	$ 753,906	$ 828,104
Gross Unrealized Gains	136	67
Gross Unrealized Losses	(3,698)	(18,924)
Fair Value	750,344	809,247
Cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	84,229	126,275
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	84,229	126,275
Cash equivalents \| Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	1,180
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Value	1,180
Cash equivalents \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	83,049	126,275
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	83,049	126,275
Marketable Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	669,677	701,829
Gross Unrealized Gains	136	67
Gross Unrealized Losses	(3,698)	(18,924)
Fair Value	666,115	682,972
Marketable Securities \| Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	225,880	119,241
Gross Unrealized Gains	133	49
Gross Unrealized Losses	(191)	(778)
Fair Value	225,822	118,512
Marketable Securities \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	121	7,271
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(71)
Fair Value	121	7,200
Marketable Securities \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		27,380
Gross Unrealized Gains		0
Gross Unrealized Losses		(80)
Fair Value		27,300
Marketable Securities \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	70,804	78,609
Gross Unrealized Gains	1	6
Gross Unrealized Losses	(50)	(126)
Fair Value	70,755	78,489
Marketable Securities \| Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	7,749	7,744
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(73)	(360)
Fair Value	7,676	7,384
Marketable Securities \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	365,123	461,584
Gross Unrealized Gains	2	12
Gross Unrealized Losses	(3,384)	(17,509)
Fair Value	$ 361,741	$ 444,087

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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