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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock and restricted stock units - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2021
Outstanding      
Balance as of the beginning of the period (in shares) 10,184,214    
Granted - restricted stock and restricted stock units (in shares) 10,067,783    
Vested and converted to shares (in shares) (4,898,655)    
Canceled (in shares) (3,788,475)    
Balance as of the end of period (in shares) 11,564,867 10,184,214  
Weighted-Average Grant Date Fair Value      
Balance as of the beginning of the period (in dollars per share) $ 14.38    
Granted - restricted stock and restricted stock units (in dollars per share) 5.71 $ 12.94 $ 15.52
Vested and converted to shares (in dollars per share) 12.96    
Canceled (in dollars per share) 12.60    
Balance as of the end of period (in dollars per share) $ 8.00 $ 14.38  
Weighted average fair value vested (in dollars) $ 63.5 $ 69.8 $ 72.4