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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)