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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Operating Loss Carryforwards [Line Items]      
Employee stock purchase plan, compensation expense $ 286,877 $ 206,404 $ 410,978
Tax benefit from compensation expense 2,200 1,000 1,700
Unrecognized tax benefits that would affect tax rate, if recognized 15,900    
Liability for uncertain tax positions 16,700 3,300 $ 2,900
Accrued interest and penalties 800    
Increase (decrease) in valuation allowance 278,000 $ 163,600  
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 2,800,000    
Operating loss carryforwards not limited to 80% of taxable income 2,300,000    
Research tax credit carryforwards 63,900    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 1,300,000    
Research tax credit carryforwards 17,000    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 38,000