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Stock-Based Compensation - RSU Activity (Details) - RSU and PSU - $ / shares
shares in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Number of Shares    
Shares outstanding at beginning of period (in shares) 4,059 0
Granted (in shares) 3,442 4,064
Forfeited (in shares) (311) (5)
Shares outstanding at end of period (in shares) 6,063 4,059
Released (in shares) (1,127)  
Shares exercisable at end of period (in shares) 6,063  
Weighted- Average Exercise Price Per Share    
Shares outstanding at beginning of period (in usd per share) $ 12.66 $ 0
Granted (in usd per share) 43.80 12.66
Released (in usd per share) 14.00  
Forfeited (in usd per share) 19.37 12.48
Shares outstanding at end of period (in usd per share) 29.82 $ 12.66
Shares exercisable at end of period (in usd per share) $ 29.82