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Summary of Business and Significant Accounting Policies - Narrative (Details)
12 Months Ended
Jan. 31, 2025
USD ($)
Jan. 31, 2024
USD ($)
Jan. 31, 2025
USD ($)
segment
Jan. 31, 2024
USD ($)
Jan. 31, 2023
USD ($)
Concentration Risk [Line Items]          
Number of operating segments | segment     1    
Capitalized contract cost, amortization term (in years) 4 years   4 years    
Capitalized contract cost, renewals and success fees, amortization term (in years)     2 years    
Impairments of costs to obtain revenue contracts     $ 0 $ 0  
Offering period     12 months    
Discount for ESPP     15.00%    
Purchase period     6 months    
Advertising expense     $ 1,000,000,000 1,100,000,000 $ 1,000,000,000
Stock options and restricted stock          
Concentration Risk [Line Items]          
Vesting period (in years)     4 years    
Restricted stock          
Concentration Risk [Line Items]          
Award requisite service period     4 years    
Foreign currency derivative contracts | Derivatives not designated as hedging instruments          
Concentration Risk [Line Items]          
Notional amount of foreign currency derivative contracts $ 10,700,000,000 $ 8,600,000,000 $ 10,700,000,000 $ 8,600,000,000  
Assets | Geographic concentration risk | Non-US          
Concentration Risk [Line Items]          
Concentration risk percentage 17.00% 16.00%      
Assets | Geographic concentration risk | United States          
Concentration Risk [Line Items]          
Concentration risk percentage 81.00% 82.00%      
Strategic investments | Investment concentration risk | Four privately held investments          
Concentration Risk [Line Items]          
Concentration risk percentage 24.00%        
Strategic investments | Investment concentration risk | Two privately held investments          
Concentration Risk [Line Items]          
Concentration risk percentage   16.00%