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Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | $ 22 | $ 67
Gross Unrealized Losses | (11,987) | (18,924)
Fair Value | 631,436 |
Cost or Amortized Cost, money market funds | 108,403 | 158,027
Cost or Amortized Cost, cash equivalents and marketable securities | 715,243 | 828,104
Fair Value, cash equivalents and marketable securities | 703,278 | 809,247
Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3) | 0
Fair Value | 81,827 |
Cost or Amortized Cost, cash equivalents and marketable securities | 81,830 | 126,275
Fair Value, cash equivalents and marketable securities |  | 126,275
Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 633,413 | 701,829
Gross Unrealized Gains | 22 | 67
Gross Unrealized Losses | (11,984) | (18,924)
Fair Value | 621,451 | 682,972
Commercial paper | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 9,988 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3) |
Fair Value | 9,985 |
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost, money market funds | 71,842 | 126,275
Fair Value, money market funds | 71,842 | 126,275
Asset-backed securities | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 6,673 | 7,271
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (12) | (71)
Fair Value | 6,662 | 7,200
Certificates of deposit | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 11,965 | 27,380
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (15) | (80)
Fair Value | 11,951 | 27,300
Commercial paper | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 99,773 | 78,609
Gross Unrealized Gains | 4 | 6
Gross Unrealized Losses | (41) | (126)
Fair Value | 99,736 | 78,489
Corporate notes and bonds | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 66,351 | 119,241
Gross Unrealized Gains | 1 | 49
Gross Unrealized Losses | (266) | (778)
Fair Value | 66,086 | 118,512
Sovereign bonds | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 7,746 | 7,744
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (269) | (360)
Fair Value | 7,477 | 7,384
U.S. government and agency securities | Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 440,905 | 461,584
Gross Unrealized Gains | 15 | 12
Gross Unrealized Losses | (11,381) | (17,509)
Fair Value | $ 429,539 | $ 444,087

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