Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	$ 0	$ 0
Gross Unrealized Losses	(28,889)	(20,494)
Fair Value	676,317
Cost or Amortized Cost, money market funds	73,674	112,809
Cost or Amortized Cost, cash equivalents and marketable securities	709,618	728,556
Fair Value, cash equivalents and marketable securities	680,729	708,062
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	4,412
Cost or Amortized Cost, cash equivalents and marketable securities	4,412	22,758
Fair Value, cash equivalents and marketable securities		22,758
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	705,206	705,798
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(28,889)	(20,494)	$ 0
Fair Value	676,317	685,304
Commercial paper \| Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		2,686
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		2,686
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost, money market funds	4,412	20,072
Fair Value, money market funds	4,412	20,072
Asset-backed securities \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	6,568	7,791
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(116)	(51)
Fair Value	6,452	7,740
Certificates of deposit \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	15,414
Gross Unrealized Gains	0
Gross Unrealized Losses	(77)
Fair Value	15,337
Commercial paper \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	44,112	9,436
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(112)	(53)
Fair Value	44,000	9,383
Corporate notes and bonds \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	131,504	129,900
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,376)	(1,796)
Fair Value	129,128	128,104
Sovereign bonds \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	7,741	8,770
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(488)	(334)
Fair Value	7,253	8,436
U.S. government and agency securities \| Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	499,867	549,901
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(25,720)	(18,260)
Fair Value	$ 474,147	$ 531,641

Cash and Cash Equivalents and Short Term Investments, Amortized Cost

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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

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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).

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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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).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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