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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2024
Jan. 31, 2023
Income Tax Disclosure [Line Items]        
Statutory U.S. federal income tax rate 21.00% 21.00% 21.00%  
Valuation allowance increase (decrease), amount $ 38,100 $ (202,200)    
Valuation allowance 66,601 28,526    
Net deferred tax asset 372,817 295,094    
Benefit from (provision for) income taxes 16,654 159,461 $ 66,446  
Cash paid for income taxes, net of tax refunds 12,510 13,600 8,500  
Unrecognized tax benefits 66,505 132,574 $ 118,981 $ 103,636
Unrecognized tax benefits that would impact effective tax rate 38,100      
Unrecognized tax benefits that would impact deferred tax assets adjustment $ 28,400      
UK        
Income Tax Disclosure [Line Items]        
Open tax year 2022      
Capitalization Requirement in Current Year        
Income Tax Disclosure [Line Items]        
Net deferred tax asset $ 64,000 $ 90,200    
Foreign        
Income Tax Disclosure [Line Items]        
Net operating loss carry forwards $ 239,900      
Research and experimental capitalized and amortized over period 15 years      
Federal        
Income Tax Disclosure [Line Items]        
Net operating loss carry forwards $ 111,100      
Tax credit carry forward $ 93,300      
Operating loss carryforwards expiration year 2037      
Research and development tax credit carryforwards expiration year 2027      
Net operating loss carry forwards with indefinite expiration $ 119,200      
Research and experimental capitalized and amortized over period 5 years      
State        
Income Tax Disclosure [Line Items]        
Net operating loss carry forwards $ 462,600      
Tax credit carry forward $ 79,800      
Operating loss carryforwards expiration year 2027