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Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 753,906 | $ 828,104
Gross Unrealized Gains | 136 | 67
Gross Unrealized Losses | (3,698) | (18,924)
Fair Value | 750,344 | 809,247
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 84,229 | 126,275
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 84,229 | 126,275
Cash equivalents | Corporate notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 1,180 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 1,180 |
Cash equivalents | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 83,049 | 126,275
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 83,049 | 126,275
Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 669,677 | 701,829
Gross Unrealized Gains | 136 | 67
Gross Unrealized Losses | (3,698) | (18,924)
Fair Value | 666,115 | 682,972
Marketable Securities | Corporate notes and bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 225,880 | 119,241
Gross Unrealized Gains | 133 | 49
Gross Unrealized Losses | (191) | (778)
Fair Value | 225,822 | 118,512
Marketable Securities | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 121 | 7,271
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (71)
Fair Value | 121 | 7,200
Marketable Securities | Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost |  | 27,380
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (80)
Fair Value |  | 27,300
Marketable Securities | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 70,804 | 78,609
Gross Unrealized Gains | 1 | 6
Gross Unrealized Losses | (50) | (126)
Fair Value | 70,755 | 78,489
Marketable Securities | Sovereign bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 7,749 | 7,744
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (73) | (360)
Fair Value | 7,676 | 7,384
Marketable Securities | U.S. government and agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 365,123 | 461,584
Gross Unrealized Gains | 2 | 12
Gross Unrealized Losses | (3,384) | (17,509)
Fair Value | $ 361,741 | $ 444,087

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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