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, 2026	Jan. 31, 2026
Assets
Short-term investments	$ 5,416,139	$ 5,139,581
Total financial assets	5,976,841	5,429,518
Liabilities
Total financial liabilities	(791)	(3,187)
Money market funds
Assets
Cash equivalents:	560,643	286,504
U.S. Treasury securities
Assets
Cash equivalents:		2,611
Short-term investments	1,585,405	1,337,466
Certificates of deposit
Assets
Short-term investments	27,669	27,690
Asset-backed securities
Assets
Short-term investments	205,966	261,917
Commercial paper
Assets
Short-term investments	44,753	75,375
Corporate notes and bonds
Assets
Short-term investments	3,289,706	3,154,559
Foreign government bonds
Assets
Short-term investments	219,696	233,401
Municipal securities
Assets
Short-term investments	41,456	37,453
U.S. agency obligations
Assets
Short-term investments	1,488	11,720
Foreign currency derivative contracts
Assets
Short-term investments	59	822
Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	(791)	(3,187)
Level 1
Assets
Total financial assets	560,643	286,504
Liabilities
Total financial liabilities	0	0
Level 1 \| Money market funds
Assets
Cash equivalents:	560,643	286,504
Level 1 \| U.S. Treasury securities
Assets
Cash equivalents:		0
Short-term investments	0	0
Level 1 \| Certificates of deposit
Assets
Short-term investments	0	0
Level 1 \| Asset-backed securities
Assets
Short-term investments	0	0
Level 1 \| Commercial paper
Assets
Short-term investments	0	0
Level 1 \| Corporate notes and bonds
Assets
Short-term investments	0	0
Level 1 \| Foreign government bonds
Assets
Short-term investments	0	0
Level 1 \| Municipal securities
Assets
Short-term investments	0	0
Level 1 \| U.S. agency obligations
Assets
Short-term investments	0	0
Level 1 \| Foreign currency derivative contracts
Assets
Short-term investments	0	0
Level 1 \| Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	0	0
Level 2
Assets
Total financial assets	5,416,198	5,143,014
Liabilities
Total financial liabilities	(791)	(3,187)
Level 2 \| Money market funds
Assets
Cash equivalents:	0	0
Level 2 \| U.S. Treasury securities
Assets
Cash equivalents:		2,611
Short-term investments	1,585,405	1,337,466
Level 2 \| Certificates of deposit
Assets
Short-term investments	27,669	27,690
Level 2 \| Asset-backed securities
Assets
Short-term investments	205,966	261,917
Level 2 \| Commercial paper
Assets
Short-term investments	44,753	75,375
Level 2 \| Corporate notes and bonds
Assets
Short-term investments	3,289,706	3,154,559
Level 2 \| Foreign government bonds
Assets
Short-term investments	219,696	233,401
Level 2 \| Municipal securities
Assets
Short-term investments	41,456	37,453
Level 2 \| U.S. agency obligations
Assets
Short-term investments	1,488	11,720
Level 2 \| Foreign currency derivative contracts
Assets
Short-term investments	59	822
Level 2 \| Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	$ (791)	$ (3,187)

Fair value portion of asset recognized for present right to economic benefit.

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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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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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Fair value of financial and nonfinancial obligations.

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