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Investments - Gross Unrealized Losses and Fair Values of Investments in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 177,265 | $ 279,909
12 months or greater | 0 | 267,581
Total, fair value | 177,265 | 547,490
Gross Unrealized Losses |  |
Less than 12 months | (144) | (380)
12 months or greater | 0 | (3,318)
Total, unrealized losses | (144) | (3,698)
Corporate notes and bonds |  |
Fair Value |  |
Less than 12 months | 80,981 | 131,443
12 months or greater | 0 | 0
Total, fair value | 80,981 | 131,443
Gross Unrealized Losses |  |
Less than 12 months | (131) | (191)
12 months or greater | 0 | 0
Total, unrealized losses | (131) | (191)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months |  | 0
12 months or greater |  | 121
Total, fair value |  | 121
Gross Unrealized Losses |  |
Less than 12 months |  | 0
12 months or greater |  | 0
Total, unrealized losses |  | 0
Commercial paper |  |
Fair Value |  |
Less than 12 months | 84,043 | 67,336
12 months or greater | 0 | 0
Total, fair value | 84,043 | 67,336
Gross Unrealized Losses |  |
Less than 12 months | (12) | (50)
12 months or greater | 0 | 0
Total, unrealized losses | (12) | (50)
Sovereign bonds |  |
Fair Value |  |
Less than 12 months |  | 0
12 months or greater |  | 7,676
Total, fair value |  | 7,676
Gross Unrealized Losses |  |
Less than 12 months |  | 0
12 months or greater |  | (73)
Total, unrealized losses |  | (73)
U.S. government and agency securities |  |
Fair Value |  |
Less than 12 months | 12,241 | 81,130
12 months or greater | 0 | 259,784
Total, fair value | 12,241 | 340,914
Gross Unrealized Losses |  |
Less than 12 months | (1) | (139)
12 months or greater | 0 | (3,245)
Total, unrealized losses | $ (1) | $ (3,384)

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