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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock and restricted stock units - $ / shares
 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Outstanding    
Balance, beginning of period (in shares) 10,184,214  
Granted (in shares) 6,601,355  
Vested and converted to shares (in shares) (2,266,302)  
Forfeited or canceled (in shares) (2,288,431)  
Balance, end of period (in shares) 12,230,836  
Weighted-Average Grant Date Fair Value    
Beginning of period (in dollars per share) $ 14.38  
Granted (in dollars per share) 6.43 $ 13.51
Vested and converted to shares (in dollars per share) 14.80  
Forfeited or canceled (in dollars per share) 13.88  
Balance, end of period (in dollars per share) $ 9.75