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Investments - Gross Unrealized Losses and Fair Values of Investments in an Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 279,909 | $ 142,875
12 months or greater | 267,581 | 510,497
Total, fair value | 547,490 | 653,372
Gross Unrealized Losses |  |
Less than 12 months | (380) | (331)
12 months or greater | (3,318) | (18,593)
Total, unrealized losses | (3,698) | (18,924)
Asset-backed securities |  |
Fair Value |  |
Less than 12 months | 0 | 2,601
12 months or greater | 121 | 4,599
Total, fair value | 121 | 7,200
Gross Unrealized Losses |  |
Less than 12 months | 0 | (12)
12 months or greater | 0 | (59)
Total, unrealized losses | 0 | (71)
Certificates of deposit |  |
Fair Value |  |
Less than 12 months |  | 27,018
12 months or greater |  | 0
Total, fair value |  | 27,018
Gross Unrealized Losses |  |
Less than 12 months |  | (80)
12 months or greater |  | 0
Total, unrealized losses |  | (80)
Commercial paper |  |
Fair Value |  |
Less than 12 months | 67,336 | 70,681
12 months or greater | 0 | 0
Total, fair value | 67,336 | 70,681
Gross Unrealized Losses |  |
Less than 12 months | (50) | (126)
12 months or greater | 0 | 0
Total, unrealized losses | (50) | (126)
Corporate notes and bonds |  |
Fair Value |  |
Less than 12 months | 131,443 | 42,575
12 months or greater | 0 | 58,766
Total, fair value | 131,443 | 101,341
Gross Unrealized Losses |  |
Less than 12 months | (191) | (113)
12 months or greater | 0 | (665)
Total, unrealized losses | (191) | (778)
Sovereign bonds |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or greater | 7,676 | 7,384
Total, fair value | 7,676 | 7,384
Gross Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or greater | (73) | (360)
Total, unrealized losses | (73) | (360)
U.S. government and agency securities |  |
Fair Value |  |
Less than 12 months | 81,130 | 0
12 months or greater | 259,784 | 439,748
Total, fair value | 340,914 | 439,748
Gross Unrealized Losses |  |
Less than 12 months | (139) | 0
12 months or greater | (3,245) | (17,509)
Total, unrealized losses | $ (3,384) | $ (17,509)

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