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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Number of Options    
Beginning balance (in shares) 6,882  
Options issued (in shares) 9  
Options exercised (in shares) (2,072)  
Options canceled/expired (in shares) (21)  
Ending balance (in shares) 4,798 6,882
Vested and expected to vest (in shares) 4,798  
Exercisable (in shares) 4,761  
Weighted-Average Exercise Price Per Share    
Beginning balance (in usd per share) $ 14.39  
Options issued (in usd per share) 22.22  
Options exercised (in usd per share) 11.71  
Options canceled/expired (in usd per share) 18.09  
Ending balance (in usd per share) 15.55 $ 14.39
Vested and expected to vest (in usd per share) 15.55  
Exercisable (in usd per share) $ 15.54  
Weighted-Average Remaining Contractual Term    
Balance 5 years 10 days 5 years 4 months 17 days
Vested and expected to vest 5 years 10 days  
Exercisable 5 years 7 days  
Aggregate Intrinsic Value    
Balance $ 1,042,879 $ 441,247
Vested and expected to vest 1,042,801  
Exercisable $ 1,034,740