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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2025
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2022
Income Tax Disclosure [Line Items]          
Federal corporate tax rate   21.00%      
Valuation allowance increase (decrease), amount   $ (202,200) $ (101,200)    
Valuation allowance $ 28,526 28,526 230,686    
Net deferred tax asset 295,094 295,094 330,965    
Decrease in unrecognized tax benefit is reasonably possible in next 12 months 70,000 70,000      
Unrecognized tax benefits 132,574 132,574 118,981 $ 103,636 $ 90,678
Unrecognized tax benefits that would impact effective tax rate 69,100 69,100      
Unrecognized tax benefits that would impact deferred tax assets adjustment 63,500 $ 63,500      
UK          
Income Tax Disclosure [Line Items]          
Open tax year   2021      
US          
Income Tax Disclosure [Line Items]          
Valuation allowance increase (decrease), amount 201,200        
Capitalization Requirement in Current Year          
Income Tax Disclosure [Line Items]          
Net deferred tax asset 90,200 $ 90,200 $ 68,000    
Foreign          
Income Tax Disclosure [Line Items]          
Net operating loss carry forwards 268,500 $ 268,500      
Research and experimental capitalized and amortized over period   15 years      
Federal          
Income Tax Disclosure [Line Items]          
Valuation allowance increase (decrease), amount 201,200        
Net operating loss carry forwards 233,700 $ 233,700      
Tax credit carry forward 69,400 $ 69,400      
Operating loss carryforwards expiration year   2037      
Research and development tax credit carryforwards expiration year   2026      
Net operating loss carry forwards with indefinite expiration 125,300 $ 125,300      
Research and experimental capitalized and amortized over period   5 years      
State          
Income Tax Disclosure [Line Items]          
Valuation allowance increase (decrease), amount 201,200        
Net operating loss carry forwards 487,300 $ 487,300      
Tax credit carry forward $ 65,600 $ 65,600      
Operating loss carryforwards expiration year   2027