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Stockholders' Equity - Narrative (Details)
shares in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2025
USD ($)
plan
shares
Jul. 31, 2024
USD ($)
Jul. 31, 2025
USD ($)
plan
shares
Jul. 31, 2024
USD ($)
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     $ 306,134,000 $ 307,160,000  
Stock repurchase program, authorized amount         $ 2,500,000,000
Stock repurchase program, remaining authorized amount $ 1,200,000,000   1,200,000,000    
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, RSUs 1,300,000,000   $ 1,300,000,000    
Unrecognized compensation cost, remaining weighted-average period for recognition     2 years 7 months 9 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 185,600,000   $ 185,600,000    
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 $ 3,500,000 $ 8,200,000 $ 6,600,000  
2018 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares) | shares 45.4   45.4    
2018 ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares) | shares 13.4   13.4