Investments - Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		$ 93,107
Gross Unrealized Gains	$ 0	6
Gross Unrealized Losses	(20,494)	(27)
Fair Value	687,990	93,086
Cost or Amortized Cost, money market funds	112,809	66,393
Cost or Amortized Cost, cash equivalents and marketable securities	728,556
Fair Value, cash equivalents and marketable securities	708,062
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost, money market funds	20,072
Fair Value, money market funds	20,072
Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		16,946
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Fair Value		16,945
Cost or Amortized Cost, cash equivalents and marketable securities	22,758
Fair Value, cash equivalents and marketable securities	22,758
Cash and cash equivalents \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	2,686	2,290
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,686	2,290
Cash and cash equivalents \| Corporate notes and bonds
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
Cash and cash equivalents \| Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		9,838
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Fair Value		9,838
Cash and cash equivalents \| Certificates of deposit
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
Available-for-sale securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	705,798	76,161
Gross Unrealized Gains	0	6
Gross Unrealized Losses	(20,494)	(26)
Fair Value	685,304	76,141
Available-for-sale securities \| Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	129,900	46,662
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(1,796)	(24)
Fair Value	128,104	46,641
Available-for-sale securities \| Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost		4,867
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Fair Value		4,868
Available-for-sale securities \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	7,791	3,264
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(51)	(1)
Fair Value	7,740	3,263
Available-for-sale securities \| Commercial paper
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	9,436	16,411
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(53)	0
Fair Value	9,383	16,412
Available-for-sale securities \| Sovereign bonds
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	8,770	1,100
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(334)	(1)
Fair Value	8,436	1,099
Available-for-sale securities \| U.S. government and agency securities
Debt Securities, Available-for-sale [Line Items]
Cost or Amortized Cost	549,901	3,857
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(18,260)	0
Fair Value	$ 531,641	$ 3,858

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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