v3.7.0.1
Common Stock and Stockholders' Equity (Tables)
3 Months Ended
Apr. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Information Related to Stock Option Activity
A summary of information related to stock option activity during the three months ended April 30, 2017 is as follows:
 
Outstanding
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value (in millions)
Balance as of January 31, 2017
9,096,592

 
$
4.34

 
$
716

Stock option grants

 

 
 
Stock options exercised
(625,290
)
 
3.60

 
 
Stock options canceled
(3,575
)
 
9.08

 
 
Balance as of April 30, 2017
8,467,727

 
$
4.39

 
$
703

Vested and expected to vest as of April 30, 2017
8,465,367

 
$
4.39

 
$
703

Exercisable as of April 30, 2017
8,364,499

 
$
4.32

 
$
695

Summary of Information Related to Restricted Stock Units Activity
A summary of information related to RSU activity during the three months ended April 30, 2017 is as follows: 
 
Number of  Shares
 
Weighted-Average
Grant Date Fair Value
Balance as of January 31, 2017
11,502,721

 
$
78.45

RSUs granted
5,726,171

 
83.77

RSUs vested
(1,987,516
)
 
76.70

RSUs forfeited
(272,289
)
 
71.93

Balance as of April 30, 2017
14,969,087

 
$
80.84