Fair Value Measurements - Schedule of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2026	Jan. 31, 2026
Assets
Short-term investments:	$ 5,430,935	$ 5,139,581
Total financial assets	5,987,827	5,429,518
Liabilities
Total financial liabilities	(1,288)	(3,187)
Money market funds
Assets
Cash equivalents:	556,885	286,504
Certificates of deposit
Assets
Short-term investments:	27,685	27,690
Asset-backed securities
Assets
Short-term investments:	134,285	261,917
Commercial paper
Assets
Short-term investments:		75,375
Corporate notes and bonds
Assets
Short-term investments:	3,348,144	3,154,559
Foreign government bonds
Assets
Short-term investments:	223,136	233,401
Municipal securities
Assets
Short-term investments:	34,817	37,453
U.S. agency obligations
Assets
Short-term investments:	1,498	11,720
U.S. Treasury securities
Assets
Cash equivalents:		2,611
Short-term investments:	1,661,370	1,337,466
Foreign currency derivative contracts
Assets
Short-term investments:	7	822
Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	(1,288)	(3,187)
Level 1
Assets
Total financial assets	556,885	286,504
Liabilities
Total financial liabilities	0	0
Level 1 \| Money market funds
Assets
Cash equivalents:	556,885	286,504
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
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 \| U.S. Treasury securities
Assets
Cash equivalents:		0
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	5,430,942	5,143,014
Liabilities
Total financial liabilities	(1,288)	(3,187)
Level 2 \| Money market funds
Assets
Cash equivalents:	0	0
Level 2 \| Certificates of deposit
Assets
Short-term investments:	27,685	27,690
Level 2 \| Asset-backed securities
Assets
Short-term investments:	134,285	261,917
Level 2 \| Commercial paper
Assets
Short-term investments:		75,375
Level 2 \| Corporate notes and bonds
Assets
Short-term investments:	3,348,144	3,154,559
Level 2 \| Foreign government bonds
Assets
Short-term investments:	223,136	233,401
Level 2 \| Municipal securities
Assets
Short-term investments:	34,817	37,453
Level 2 \| U.S. agency obligations
Assets
Short-term investments:	1,498	11,720
Level 2 \| U.S. Treasury securities
Assets
Cash equivalents:		2,611
Short-term investments:	1,661,370	1,337,466
Level 2 \| Foreign currency derivative contracts
Assets
Short-term investments:	7	822
Level 2 \| Foreign currency derivative contracts
Liabilities
Foreign currency derivative contracts	$ (1,288)	$ (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 as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

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