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Stockholders' Equity - RSU Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Number of Units      
Granted (in shares) 4,032    
RSUs      
Number of Units      
Unvested at beginning of period (in shares) 13,859    
Granted (in shares) 4,022    
Vested (in shares) (6,318)    
Canceled (in shares) (977)    
Unvested at end of period (in shares) 10,586 13,859  
Weighted-Average Grant Date Fair Value      
Unvested at beginning of period (in usd per share) $ 46.28    
Granted (in usd per share) 144.80 $ 56.05 $ 53.77
Vested (in usd per share) 44.67    
Canceled (in usd per share) 53.81    
Unvested at end of period (in usd per share) $ 83.98 $ 46.28