Fair Value Measurements - Schedule of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jan. 31, 2024
Assets
Short-term investments	$ 3,567,841	$ 3,324,269
U.S. Treasury securities
Assets
Short-term investments	635,348	714,459
Commercial paper
Assets
Short-term investments	284,018	144,245
Certificates of deposit
Assets
Short-term investments	98,618	94,283
Asset-backed securities
Assets
Short-term investments	656,355	606,981
Corporate notes and bonds
Assets
Short-term investments	1,707,067	1,585,029
Foreign government bonds
Assets
Short-term investments	54,378	50,206
Municipal securities
Assets
Short-term investments	76,348	79,474
U.S. agency obligations
Assets
Short-term investments	55,709	49,592
Fair value, measurements recurring
Assets
Total financial assets	3,963,452	3,408,051
Liabilities
Total financial liabilities	(806)	(232)
Fair value, measurements recurring \| Money market funds
Assets
Cash equivalents:	292,069	73,197
Fair value, measurements recurring \| U.S. Treasury securities
Assets
Cash equivalents:	67,891	9,969
Short-term investments	635,348	714,459
Fair value, measurements recurring \| Commercial paper
Assets
Cash equivalents:	35,543
Short-term investments	284,018	144,245
Fair value, measurements recurring \| Certificates of deposit
Assets
Short-term investments	98,618	94,283
Fair value, measurements recurring \| Asset-backed securities
Assets
Short-term investments	656,355	606,981
Fair value, measurements recurring \| Corporate notes and bonds
Assets
Short-term investments	1,707,067	1,585,029
Fair value, measurements recurring \| Foreign government bonds
Assets
Short-term investments	54,378	50,206
Fair value, measurements recurring \| Municipal securities
Assets
Short-term investments	76,348	79,474
Fair value, measurements recurring \| U.S. agency obligations
Assets
Short-term investments	55,709	49,592
Fair value, measurements recurring \| Foreign currency derivative contracts
Assets
Short-term investments	108	616
Fair value, measurements recurring \| Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	(806)	(232)
Fair value, measurements recurring \| Level 1
Assets
Total financial assets	292,069	73,197
Liabilities
Total financial liabilities	0	0
Fair value, measurements recurring \| Level 1 \| Money market funds
Assets
Cash equivalents:	292,069	73,197
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 \| Commercial paper
Assets
Cash equivalents:	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 \| Corporate notes and bonds
Assets
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	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
Liabilities
Foreign currency derivative contracts	0	0
Fair value, measurements recurring \| Level 2
Assets
Total financial assets	3,671,383	3,334,854
Liabilities
Total financial liabilities	(806)	(232)
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:	67,891	9,969
Short-term investments	635,348	714,459
Fair value, measurements recurring \| Level 2 \| Commercial paper
Assets
Cash equivalents:	35,543
Short-term investments	284,018	144,245
Fair value, measurements recurring \| Level 2 \| Certificates of deposit
Assets
Short-term investments	98,618	94,283
Fair value, measurements recurring \| Level 2 \| Asset-backed securities
Assets
Short-term investments	656,355	606,981
Fair value, measurements recurring \| Level 2 \| Corporate notes and bonds
Assets
Short-term investments	1,707,067	1,585,029
Fair value, measurements recurring \| Level 2 \| Foreign government bonds
Assets
Short-term investments	54,378	50,206
Fair value, measurements recurring \| Level 2 \| Municipal securities
Assets
Short-term investments	76,348	79,474
Fair value, measurements recurring \| Level 2 \| U.S. agency obligations
Assets
Short-term investments	55,709	49,592
Fair value, measurements recurring \| Level 2 \| Foreign currency derivative contracts
Assets
Short-term investments	108	616
Fair value, measurements recurring \| Level 2 \| Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	$ (806)	$ (232)

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
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
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Fair value of financial and nonfinancial obligations.

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