Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Cash equivalents:
Cost or Amortized Cost	$ 157,530	$ 84,229
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8)	0
Fair Value	157,522	84,229
Marketable securities:
Cost or Amortized Cost	704,274	669,677
Gross Unrealized Gains	1,912	136
Gross Unrealized Losses	(136)	(3,698)
Fair Value	706,050	666,115
Total cash and cash equivalents and marketable securities, Cost or amortized cost	861,804	753,906
Total cash and cash equivalents and marketable securities, Gross unrealized gains	1,912	136
Total cash and cash equivalents and marketable securities, Gross unrealized Losses	(144)	(3,698)
Total cash equivalents and marketable securities	863,572	750,344
Asset-backed securities
Marketable securities:
Cost or Amortized Cost		121
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		121
Commercial paper
Marketable securities:
Cost or Amortized Cost	42,860	70,804
Gross Unrealized Gains	7	1
Gross Unrealized Losses	(4)	(50)
Fair Value	42,863	70,755
Corporate notes and bonds
Marketable securities:
Cost or Amortized Cost	501,202	225,880
Gross Unrealized Gains	1,373	133
Gross Unrealized Losses	(131)	(191)
Fair Value	502,444	225,822
Sovereign bonds
Marketable securities:
Cost or Amortized Cost		7,749
Gross Unrealized Gains		0
Gross Unrealized Losses		(73)
Fair Value		7,676
U.S. government and agency securities
Marketable securities:
Cost or Amortized Cost	160,212	365,123
Gross Unrealized Gains	532	2
Gross Unrealized Losses	(1)	(3,384)
Fair Value	160,743	361,741
Commercial paper
Cash equivalents:
Cost or Amortized Cost	73,055
Gross Unrealized Gains	0
Gross Unrealized Losses	(8)
Fair Value	73,047
Corporate notes and bonds
Cash equivalents:
Cost or Amortized Cost		1,180
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		1,180
Money market funds
Cash equivalents:
Cost or Amortized Cost	84,475	83,049
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 84,475	$ 83,049

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Fair value portion of asset recognized for present right to economic benefit.

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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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Amount, before tax, of unrealized loss 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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