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Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Cash equivalents: |  |
Cost or Amortized Cost | $ 153,685 | $ 84,229
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Total cash equivalents | 153,684 | 84,229
Marketable securities: |  |
Cost or Amortized Cost | 678,310 | 669,677
Gross Unrealized Gains | 1,694 | 136
Gross Unrealized Losses | (334) | (3,698)
Fair Value | 679,670 | 666,115
Total cash and cash equivalents and marketable securities, Cost or amortized cost | 831,995 | 753,906
Total cash and cash equivalents and marketable securities, Gross unrealized gains | 1,694 | 136
Total cash and cash equivalents and marketable securities, Gross unrealized Losses | (335) | (3,698)
Total cash equivalents and marketable securities | 833,354 | 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 | 41,465 | 70,804
Gross Unrealized Gains | 21 | 1
Gross Unrealized Losses | 0 | (50)
Fair Value | 41,486 | 70,755
Corporate notes and bonds |  |
Marketable securities: |  |
Cost or Amortized Cost | 445,676 | 225,880
Gross Unrealized Gains | 1,370 | 133
Gross Unrealized Losses | (283) | (191)
Fair Value | 446,763 | 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 | 191,169 | 365,123
Gross Unrealized Gains | 303 | 2
Gross Unrealized Losses | (51) | (3,384)
Fair Value | 191,421 | 361,741
Commercial paper |  |
Cash equivalents: |  |
Cost or Amortized Cost | 24,406 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Total cash equivalents | 24,405 |
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 | 129,279 | 83,049
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Total cash equivalents | $ 129,279 | $ 83,049

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