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Common Stock and Stockholders' Equity (Tables)
6 Months Ended
Jul. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Information Related to Restricted Stock Units Activity A summary of information related to RSU activity during the six months ended July 31, 2019, is as follows: 
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
Balance as of January 31, 2019
13,013,289

 
$
108.12

RSUs granted
4,623,949

 
191.13

RSUs vested
(3,426,770
)
 
103.56

RSUs forfeited
(511,962
)
 
119.05

Balance as of July 31, 2019
13,698,506

 
136.87


Summary of Information Related to Stock Option Activity A summary of information related to stock option activity during the six months ended July 31, 2019, is as follows (in millions, except share and per share data):
 
Outstanding Stock Options
 
Weighted-Average Exercise Price
 
Aggregate Intrinsic Value
Balance as of January 31, 2019
5,780,742

 
$
7.96

 
$
1,003

Stock options granted

 

 
 
Stock options exercised
(1,250,557
)
 
5.62

 
 
Stock options canceled
(18,568
)
 
22.23

 
 
Balance as of July 31, 2019
4,511,617

 
8.55

 
864

Vested and expected to vest as of July 31, 2019
4,467,012

 
8.31

 
856

Exercisable as of July 31, 2019
3,947,066

 
5.67

 
767