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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Operating Loss Carryforwards [Line Items]        
Income tax benefit $ 819,944 $ (19,699) $ (7,573)  
Valuation allowance, deferred tax asset, amount 837,300      
Tax benefit from compensation expense 143,000 7,100 3,300  
Increase (decrease) in tax benefit 16,000 (3,800) (2,200)  
Unrecognized tax benefits 75,546 $ 60,744 $ 47,946 $ 46,729
Unrecognized tax benefits that would affect tax rate, if recognized 60,900      
Accrued interest and penalties 2,200      
Domestic Tax Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 1,800,000      
Operating loss carryforwards not limited to 80% of taxable income 1,800,000      
Research tax credit carryforwards 190,500      
Domestic Tax Jurisdiction | California        
Operating Loss Carryforwards [Line Items]        
Research tax credit carryforwards 61,500      
State and Local Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards 1,300,000      
Foreign Tax Jurisdiction        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforwards $ 145,400