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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

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