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Employee Incentive Plans Schedule of Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Number of Options    
Number of options, outstanding beginning of period (in shares) 17,803,794  
Number of options, granted (in shares) 415,547  
Number of options, exercised (in shares) (5,422,281)  
Number of options, canceled (in shares) (437,758)  
Number of options, outstanding end of period (in shares) 12,359,302 17,803,794
Vested and expected to vest, number of options (in shares) 12,359,302  
Vested and exercisable, number of options (in shares) 8,723,638  
Weighted- Average Exercise Price    
Options outstanding, weighted average exercise price beginning of period (in dollars per share) $ 9.16  
Options granted, weighted average exercise price (in dollars per share) 82.33  
Options exercised, weighted average exercise price (in dollars per share) 8.37  
Options canceled, weighted average exercise price (in dollars per share) 13.35  
Options outstanding, weighted average exercise price end of period (in dollars per share) 11.82 $ 9.16
Vested and expected to vest, weighted average exercise price (in dollars per share) 11.82  
Vested and exercisable, weighted average exercise price (in dollars per share) $ 8.16  
Additional Disclosures    
Options outstanding, weighted average remaining contractual term 6 years 2 months 12 days 7 years 1 month 6 days
Options outstanding, aggregate intrinsic value $ 1,436,487 $ 1,304,446
Vested and expected to vest, weighted average remaining contractual term 6 years 2 months 12 days  
Vested and exercisable, weighted average remaining contractual term 5 years 10 months 24 days  
Vested and expected to vest, aggregate intrinsic value $ 1,436,487  
Vested and exercisable, aggregate intrinsic value $ 1,045,852