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Stockholders' Equity - Narrative (Details) shares in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2025 USD ($) plan shares	Oct. 31, 2024 USD ($)	Oct. 31, 2025 USD ($) plan shares	Oct. 31, 2024 USD ($)	May 31, 2025 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans | plan	2		2
Employee stock purchase plan, compensation expense			$ 466,776,000	$ 460,388,000
Stock repurchase program, authorized amount					$ 2,500,000,000
Stock repurchase program, remaining authorized amount	$ 1,000,000,000.0		1,000,000,000.0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, RSUs	1,200,000,000		$ 1,200,000,000
Unrecognized compensation cost, remaining weighted-average period for recognition			2 years 5 months 15 days
RSUs | Market Based and Performance Based Vesting Conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of unvested RSU's	174,700,000		$ 174,700,000
Performance vesting percentage			100.00%
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan, compensation expense	$ 4,700,000	$ 3,300,000	$ 12,900,000	$ 9,900,000
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares) | shares	46.2		46.2
2018 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved for future issuance (in shares) | shares	13.1		13.1

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