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Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 708,840 | $ 93,107
Gross Unrealized Gains | 1 | 6
Gross Unrealized Losses | (5,361) | (27)
Fair Value | 703,480 | 93,086
Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 22,981 | 16,946
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (1)
Fair Value | 22,981 | 16,945
Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 685,859 | 76,161
Gross Unrealized Gains | 1 | 6
Gross Unrealized Losses | (5,361) | (26)
Fair Value | 680,499 | 76,141
Commercial paper | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost |  | 2,290
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 2,290
Corporate notes and bonds | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost |  | 3,517
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Fair Value |  | 3,516
Corporate notes and bonds | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 102,529 | 46,662
Gross Unrealized Gains | 1 | 3
Gross Unrealized Losses | (343) | (24)
Fair Value | 102,187 | 46,641
Money market funds | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 22,981 | 9,838
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 22,981 | 9,838
Certificates of deposit | Cash and Cash Equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost |  | 1,301
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 1,301
Certificates of deposit | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 137 | 4,867
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Fair Value | 137 | 4,868
Asset-backed securities | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 3,569 | 3,264
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | (1)
Fair Value | 3,565 | 3,263
Commercial paper | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 2,656 | 16,411
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (3) | 0
Fair Value | 2,653 | 16,412
Sovereign bonds | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 8,775 | 1,100
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (84) | (1)
Fair Value | 8,691 | 1,099
U.S. government and agency securities | Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 568,193 | 3,857
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (4,927) | 0
Fair Value | $ 563,266 | $ 3,858

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amortized cost excluding accrued interest, after allowance for credit loss, of 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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