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

Cash and Cash Equivalents and Short Term Investments, Amortized Cost

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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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