Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Oct. 31, 2023	Jan. 31, 2023
Assets
Short-term investments	$ 3,198,570	$ 2,216,163
U.S. Treasury securities
Assets
Short-term investments	764,158	316,197
Certificates of deposit
Assets
Short-term investments	111,483	37,963
Asset-backed securities
Assets
Short-term investments	570,502	442,958
Commercial paper
Assets
Short-term investments	193,773	154,525
Corporate notes and bonds
Assets
Short-term investments	1,405,372	1,207,964
Foreign government bonds
Assets
Short-term investments	31,949	24,151
Municipal securities
Assets
Short-term investments	72,420
U.S. agency obligations
Assets
Short-term investments	48,913	32,405
Fair value, measurements recurring
Assets
Total financial assets	3,365,457	2,426,929
Total financial liabilities	(693)
Fair value, measurements recurring \| Money market funds
Assets
Cash equivalents:	150,895	180,895
Fair value, measurements recurring \| U.S. Treasury securities
Assets
Cash equivalents:	15,978	22,929
Short-term investments	764,158	316,197
Fair value, measurements recurring \| Certificates of deposit
Assets
Short-term investments	111,483	37,963
Fair value, measurements recurring \| Asset-backed securities
Assets
Short-term investments	570,502	442,958
Fair value, measurements recurring \| Commercial paper
Assets
Short-term investments	193,773	154,525
Fair value, measurements recurring \| Corporate notes and bonds
Assets
Cash equivalents:		6,691
Short-term investments	1,405,372	1,207,964
Fair value, measurements recurring \| Foreign government bonds
Assets
Short-term investments	31,949	24,151
Fair value, measurements recurring \| Municipal securities
Assets
Short-term investments	72,420
Fair value, measurements recurring \| U.S. agency obligations
Assets
Short-term investments	48,913	32,405
Fair value, measurements recurring \| Foreign currency derivative contracts
Assets
Short-term investments	14	251
Fair value, measurements recurring \| Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	(693)
Fair value, measurements recurring \| Level 1
Assets
Total financial assets	150,895	180,895
Total financial liabilities	0
Fair value, measurements recurring \| Level 1 \| Money market funds
Assets
Cash equivalents:	150,895	180,895
Fair value, measurements recurring \| Level 1 \| U.S. Treasury securities
Assets
Cash equivalents:	0	0
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Certificates of deposit
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Asset-backed securities
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Commercial paper
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Corporate notes and bonds
Assets
Cash equivalents:		0
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Foreign government bonds
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Municipal securities
Assets
Short-term investments	0
Fair value, measurements recurring \| Level 1 \| U.S. agency obligations
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Foreign currency derivative contracts
Assets
Short-term investments	0	0
Fair value, measurements recurring \| Level 1 \| Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	0
Fair value, measurements recurring \| Level 2
Assets
Total financial assets	3,214,562	2,246,034
Total financial liabilities	(693)
Fair value, measurements recurring \| Level 2 \| Money market funds
Assets
Cash equivalents:	0	0
Fair value, measurements recurring \| Level 2 \| U.S. Treasury securities
Assets
Cash equivalents:	15,978	22,929
Short-term investments	764,158	316,197
Fair value, measurements recurring \| Level 2 \| Certificates of deposit
Assets
Short-term investments	111,483	37,963
Fair value, measurements recurring \| Level 2 \| Asset-backed securities
Assets
Short-term investments	570,502	442,958
Fair value, measurements recurring \| Level 2 \| Commercial paper
Assets
Short-term investments	193,773	154,525
Fair value, measurements recurring \| Level 2 \| Corporate notes and bonds
Assets
Cash equivalents:		6,691
Short-term investments	1,405,372	1,207,964
Fair value, measurements recurring \| Level 2 \| Foreign government bonds
Assets
Short-term investments	31,949	24,151
Fair value, measurements recurring \| Level 2 \| Municipal securities
Assets
Short-term investments	72,420
Fair value, measurements recurring \| Level 2 \| U.S. agency obligations
Assets
Short-term investments	48,913	32,405
Fair value, measurements recurring \| Level 2 \| Foreign currency derivative contracts
Assets
Short-term investments	14	$ 251
Fair value, measurements recurring \| Level 2 \| Foreign currency derivative contracts
Assets
Foreign currency derivative contracts	$ (693)

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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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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Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Fair value of financial and nonfinancial obligations.

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