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Stockholders' Equity - Narrative (Details)
shares in Millions
3 Months Ended
Apr. 30, 2025
USD ($)
plan
shares
Apr. 30, 2024
USD ($)
May 31, 2024
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2022
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock-based compensation plans | plan 2        
Employee stock purchase plan, compensation expense $ 145,596,000 $ 142,504,000      
Stock repurchase program, authorized amount         $ 200,000,000
Stock repurchase program, additional authorized amount     $ 1,000,000,000.0 $ 300,000,000.0  
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, RSUs $ 1,100,000,000        
Unrecognized compensation cost, remaining weighted-average period for recognition 2 years 6 months 3 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 $ 151,000,000.0        
Performance vesting percentage 100.00%        
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock purchase plan, compensation expense $ 3,500,000 $ 3,000,000.0      
2018 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares) | shares 49.7        
2018 ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares) | shares 13.4