Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 31, 2022	Jan. 31, 2022
Assets
Short-term investments	$ 2,157,396	$ 1,238,064
U.S. treasury securities
Assets
Short-term investments	372,878	288,804
Commercial paper
Assets
Short-term investments	146,615	29,430
Corporate notes and bonds
Assets
Short-term investments	1,095,400	663,909
Certificates of deposit
Assets
Short-term investments	68,718	13,485
Asset-backed securities
Assets
Short-term investments	416,601	190,289
Foreign government bonds
Assets
Short-term investments	25,024	24,411
U.S. agency obligations
Assets
Short-term investments	32,160	27,736
Fair value, measurements recurring
Assets
Total financial assets	2,324,981	1,676,118
Fair value, measurements recurring \| Money market funds
Assets
Cash equivalents:	117,017	428,411
Fair value, measurements recurring \| U.S. treasury securities
Assets
Short-term investments	372,878	288,804
Fair value, measurements recurring \| Commercial paper
Assets
Cash equivalents:	43,866
Short-term investments	146,615	29,430
Fair value, measurements recurring \| Corporate notes and bonds
Assets
Cash equivalents:	6,673	5,853
Short-term investments	1,095,400	663,909
Fair value, measurements recurring \| Certificates of deposit
Assets
Short-term investments	68,718	13,485
Fair value, measurements recurring \| Asset-backed securities
Assets
Cash equivalents:		2,568
Short-term investments	416,601	190,289
Fair value, measurements recurring \| Foreign government bonds
Assets
Short-term investments	25,024	24,411
Fair value, measurements recurring \| U.S. agency obligations
Assets
Short-term investments	32,160	27,736
Fair value, measurements recurring \| Foreign currency derivative contracts
Assets
Short-term investments	29	1,222
Fair value, measurements recurring \| Level 1
Assets
Total financial assets	117,017	428,411
Fair value, measurements recurring \| Level 1 \| Money market funds
Assets
Cash equivalents:	117,017	428,411
Fair value, measurements recurring \| Level 1 \| U.S. treasury securities
Assets
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 \| Corporate notes and bonds
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
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 \| 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 2
Assets
Total financial assets	2,207,964	1,247,707
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
Short-term investments	372,878	288,804
Fair value, measurements recurring \| Level 2 \| Commercial paper
Assets
Cash equivalents:	43,866
Short-term investments	146,615	29,430
Fair value, measurements recurring \| Level 2 \| Corporate notes and bonds
Assets
Cash equivalents:	6,673	5,853
Short-term investments	1,095,400	663,909
Fair value, measurements recurring \| Level 2 \| Certificates of deposit
Assets
Short-term investments	68,718	13,485
Fair value, measurements recurring \| Level 2 \| Asset-backed securities
Assets
Cash equivalents:		2,568
Short-term investments	416,601	190,289
Fair value, measurements recurring \| Level 2 \| Foreign government bonds
Assets
Short-term investments	25,024	24,411
Fair value, measurements recurring \| Level 2 \| U.S. agency obligations
Assets
Short-term investments	32,160	27,736
Fair value, measurements recurring \| Level 2 \| Foreign currency derivative contracts
Assets
Short-term investments	$ 29	$ 1,222

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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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