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Investments - Gross Unrealized Losses and Fair Values of Investments in an Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Fair Value    
Less than 12 months $ 362,036 $ 279,909
12 months or greater 124,793 267,581
Total, fair value 486,829 547,490
Gross Unrealized Losses    
Less than 12 months (692) (380)
12 months or greater (790) (3,318)
Total, unrealized losses (1,482) (3,698)
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 43,756 67,336
12 months or greater 0 0
Total, fair value 43,756 67,336
Gross Unrealized Losses    
Less than 12 months (33) (50)
12 months or greater 0 0
Total, unrealized losses (33) (50)
Corporate notes and bonds    
Fair Value    
Less than 12 months 232,976 131,443
12 months or greater 0 0
Total, fair value 232,976 131,443
Gross Unrealized Losses    
Less than 12 months (414) (191)
12 months or greater 0 0
Total, unrealized losses (414) (191)
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 85,304 81,130
12 months or greater 124,793 259,784
Total, fair value 210,097 340,914
Gross Unrealized Losses    
Less than 12 months (245) (139)
12 months or greater (790) (3,245)
Total, unrealized losses $ (1,035) $ (3,384)