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Stockholders' Equity - Narrative (Details)
 12 Months Ended
Jan. 31, 2025
USD ($)
plan
$ / shares
shares
Jan. 31, 2024
USD ($)
$ / shares
shares
Jan. 31, 2023
USD ($)
$ / shares
shares
Feb. 01, 2025
shares
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            
Shares granted in period (in shares) | shares 0 0 0        
Unrecognized compensation cost, options $ 0            
Intrinsic value of options exercised 73,600,000 $ 23,600,000 $ 48,100,000        
Employee stock purchase plan, compensation expense $ 610,335,000 $ 616,847,000 $ 538,726,000        
Reserved for future issuance (in shares) | shares 78,557,000 74,641,000          
Stock repurchase program, authorized amount             $ 200,000,000.0
Stock repurchase program, additional authorized amount         $ 1,000,000,000.0 $ 300,000,000.0  
2003 Stock Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards outstanding (in shares) | shares 0            
2018 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual increase in shares reserved, percentage of total shares 5.00%            
2018 Plan | Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase in shares reserved for issuance (in shares) | shares       10,100,000      
RSUs              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Awards outstanding (in shares) | shares 27,268,000 26,700,000          
Weighted average grant date fair value of RSUs (in usd per share) | $ / shares $ 60.89 $ 54.15 $ 66.50        
Grant date fair value $ 627,900,000 $ 631,800,000 $ 461,800,000        
Unrecognized compensation cost, RSUs $ 1,200,000,000            
Unrecognized compensation cost, remaining weighted-average period for recognition 2 years 8 months 12 days            
Reserved for future issuance (in shares) | shares 27,268,000 26,965,000          
RSUs | Market Based and Performance Based Vesting Conditions              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value $ 147,100,000            
Performance vesting percentage 100.00%            
RSUs | 2018 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 4 years            
RSUs | 2018 Plan | Alternate vesting option              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Vesting period 1 year            
Annual vesting percentage 25.00%            
ESPP              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual increase in shares reserved, percentage of total shares 1.00%            
Increase in shares reserved for issuance (in shares) | shares 3,800,000            
Employee contribution, maximum percentage of earnings 15.00%            
Percent of purchase price of fair value of common stock 85.00%            
ESPP offering period 6 months            
Employee stock purchase plan, compensation expense $ 13,400,000 $ 16,000,000.0 $ 22,200,000        
Reserved for future issuance (in shares) | shares 11,819,000 10,628,000