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Investments - Gross Unrealized Losses and Fair Values of Investments in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 166,814 | $ 279,909
12 months or greater | 0 | 267,581
Total | 166,814 | 547,490
Gross Unrealized Losses |  |
Less than 12 months | (335) | (380)
12 months or greater | 0 | (3,318)
Total | (335) | (3,698)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months |  | 0
12 months or greater |  | 121
Total |  | 121
Gross Unrealized Losses |  |
Less than 12 months |  | 0
12 months or greater |  | 0
Total |  | 0
Commercial paper |  |
Fair Value |  |
Less than 12 months | 24,882 | 67,336
12 months or greater | 0 | 0
Total | 24,882 | 67,336
Gross Unrealized Losses |  |
Less than 12 months | (1) | (50)
12 months or greater | 0 | 0
Total | (1) | (50)
Corporate notes and bonds |  |
Fair Value |  |
Less than 12 months | 104,502 | 131,443
12 months or greater | 0 | 0
Total | 104,502 | 131,443
Gross Unrealized Losses |  |
Less than 12 months | (283) | (191)
12 months or greater | 0 | 0
Total | (283) | (191)
Sovereign bonds |  |
Fair Value |  |
Less than 12 months |  | 0
12 months or greater |  | 7,676
Total |  | 7,676
Gross Unrealized Losses |  |
Less than 12 months |  | 0
12 months or greater |  | (73)
Total |  | (73)
U.S. government and agency securities |  |
Fair Value |  |
Less than 12 months | 37,430 | 81,130
12 months or greater | 0 | 259,784
Total | 37,430 | 340,914
Gross Unrealized Losses |  |
Less than 12 months | (51) | (139)
12 months or greater | 0 | (3,245)
Total | $ (51) | $ (3,384)

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