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Investments - Schedule of Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Cash equivalents:    
Cost or Amortized Cost $ 127,171 $ 157,530
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4) (8)
Total cash equivalents 127,167 157,522
Marketable securities:    
Cost or Amortized Cost 707,141 704,274
Gross Unrealized Gains 2,029 1,912
Gross Unrealized Losses (52) (136)
Fair Value 709,118 706,050
Total cash and cash equivalents and marketable securities, Cost or amortized cost 834,312 861,804
Total cash and cash equivalents and marketable securities, Gross unrealized gains 2,029 1,912
Total cash and cash equivalents and marketable securities, Gross unrealized Losses (56) (144)
Total cash equivalents and marketable securities 836,285 863,572
Commercial paper    
Marketable securities:    
Cost or Amortized Cost 30,587 42,860
Gross Unrealized Gains 4 7
Gross Unrealized Losses (1) (4)
Fair Value 30,590 42,863
Corporate notes and bonds    
Marketable securities:    
Cost or Amortized Cost 515,522 501,202
Gross Unrealized Gains 1,442 1,373
Gross Unrealized Losses (46) (131)
Fair Value 516,918 502,444
U.S. government and agency securities    
Marketable securities:    
Cost or Amortized Cost 161,032 160,212
Gross Unrealized Gains 583 532
Gross Unrealized Losses (5) (1)
Fair Value 161,610 160,743
Commercial paper    
Cash equivalents:    
Cost or Amortized Cost 34,977 73,055
Gross Unrealized Gains 0 0
Gross Unrealized Losses (4) (8)
Total cash equivalents 34,973 73,047
Money market funds    
Cash equivalents:    
Cost or Amortized Cost 92,194 84,475
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Total cash equivalents $ 92,194 $ 84,475