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Common Stock and Stockholders' Equity (Tables)

9 Months Ended

Oct. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Information Related to Restricted Stock Units Activity

A summary of information related to RSU activity during the nine months ended October 31, 2018 is as follows: 

	Number of Shares			Weighted-Average Grant Date Fair Value
Balance as of January 31, 2018	12,819,516			$	84.77
RSUs granted	6,408,869			127.78
RSUs vested	(4,722,787	)		84.06
RSUs forfeited	(699,400	)		94.52
Balance as of October 31, 2018	13,806,198			$	104.48

Summary of Information Related to Stock Option Activity

A summary of information related to stock option activity during the nine months ended October 31, 2018 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, 2018	6,595,486			$	4.23			$	763
Stock options assumed	1,103,942			26.84
Stock options exercised	(1,153,579	)		9.10
Stock options canceled	(33,320	)		15.06
Balance as of October 31, 2018	6,512,529			$	7.14			$	820
Vested and expected to vest as of October 31, 2018	6,446,090			$	7.41			$	810
Exercisable as of October 31, 2018	5,643,205			$	4.58			$	725

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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