Common Stock and Stockholders' Equity (Tables)

3 Months Ended

Apr. 30, 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 three months ended April 30, 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	4,719,296		125.00
RSUs vested	(2,259,472	)	82.40
RSUs forfeited	(230,719	)	87.67
Balance as of April 30, 2018	15,048,621		$	97.70

Summary of Information Related to Stock Option Activity

A summary of information related to stock option activity during the three months ended April 30, 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 granted	—		—
Stock options exercised	(516,354	)	5.03
Stock options canceled	—		—
Balance as of April 30, 2018	6,079,132		$	4.16	$	734
Vested and expected to vest as of April 30, 2018	6,079,126		$	4.16	$	734
Exercisable as of April 30, 2018	6,078,882		$	4.16	$	734