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Income Taxes - Components of Net Deferred Tax Balances (Details) - USD ($)
$ in Thousands
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Deferred tax assets        
Net operating loss carryforwards $ 486,505 $ 570,152    
Accruals and reserves 16,772 14,895    
Stock-based compensation 42,949 39,320    
Research and development credits 179,275 147,959    
Capitalized research and development expenses 350,729 246,945    
Other 54,286 53,140    
Total deferred tax assets 1,130,516 1,072,411    
Less: Valuation allowance (112,847) (934,816) $ (1,032,016) $ (999,191)
Deferred tax assets, net of valuation allowance 1,017,669 137,595    
Deferred tax liabilities        
Deferred contract acquisition costs (121,678) (100,806)    
Fixed Assets and Intangible Assets (54,137) (26,258)    
Other (21,980) (25,242)    
Total deferred tax liabilities (197,795) (152,306)    
Net deferred tax assets / (liabilities) $ 819,874      
Net deferred tax assets / (liabilities)   $ (14,711)