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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock and restricted stock units - $ / shares
6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Outstanding    
Balance, beginning of period (in shares) 9,545,352  
Granted (in shares) 5,443,718  
Vested and converted to shares (in shares) (2,067,646)  
Forfeited or canceled (in shares) (1,679,439)  
Balance, end of period (in shares) 11,241,985  
Weighted-Average Grant Date Fair Value    
Balance, beginning of period (in dollars per share) $ 16.71  
Granted (in dollars per share) 13.51 $ 15.36
Vested and converted to shares (in dollars per share) 16.06  
Forfeited or canceled (in dollars per share) 16.75  
Balance, end of period (in dollars per share) 15.27  
Granted (in dollars per share) $ 13.51 $ 15.36