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Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Mar. 31, 2024
Cash equivalents:
Cost or Amortized Cost	$ 138,921	$ 84,229
Gross Unrealized Gains	2	0
Gross Unrealized Losses	(1)	0
Total cash equivalents	138,922	84,229
Marketable securities:
Cost or Amortized Cost	617,731	669,677
Gross Unrealized Gains	3,620	136
Gross Unrealized Losses	(41)	(3,698)
Fair Value	621,310	666,115
Total cash and cash equivalents and marketable securities, Cost or amortized cost	756,652	753,906
Total cash and cash equivalents and marketable securities, Gross unrealized gains	3,622	136
Total cash and cash equivalents and marketable securities, Gross unrealized Losses	(42)	(3,698)
Total cash equivalents and marketable securities	760,232	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	49,639	70,804
Gross Unrealized Gains	59	1
Gross Unrealized Losses	0	(50)
Fair Value	49,698	70,755
Corporate notes and bonds
Marketable securities:
Cost or Amortized Cost	460,784	225,880
Gross Unrealized Gains	2,990	133
Gross Unrealized Losses	(41)	(191)
Fair Value	463,733	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	107,308	365,123
Gross Unrealized Gains	571	2
Gross Unrealized Losses	0	(3,384)
Fair Value	107,879	361,741
Commercial paper
Cash equivalents:
Cost or Amortized Cost	14,949
Gross Unrealized Gains	2
Gross Unrealized Losses	(1)
Total cash equivalents	14,950
Corporate notes and bonds
Cash equivalents:
Cost or Amortized Cost		1,180
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Total cash equivalents		1,180
Money market funds
Cash equivalents:
Cost or Amortized Cost	123,972	83,049
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Total cash equivalents	$ 123,972	$ 83,049

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