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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)