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Common Stock and Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2019

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 fiscal 2019 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	6,991,459			129.62
RSUs vested	(5,893,133	)		84.58
RSUs forfeited	(904,553	)		96.79
Balance as of January 31, 2019	13,013,289			$	108.12

Summary of Stock Option Activity

A summary of information related to stock option activity during fiscal 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, 2018	6,595,486			$	4.23			$	763
Stock options assumed	1,103,942			26.84
Stock options exercised	(1,872,545	)		5.68
Stock options canceled	(46,141	)		18.77
Balance as of January 31, 2019	5,780,742			$	7.96			$	1,003
Vested and expected to vest as of January 31, 2019	5,706,507			$	7.66			$	992
Exercisable as of January 31, 2019	4,985,686			$	4.74			$	881

Assumptions Used for Periods Presented

The fair value of stock options assumed was estimated using the following assumptions:

	Year Ended January 31, 2019
Expected volatility	31.5% – 34.3%
Expected term (in years)	0.03 – 2.42
Risk-free interest rate	2.10% – 2.72%
Dividend yield	—%

The fair value of stock purchase rights granted under the ESPP was estimated using the following assumptions:

	Year Ended January 31,
	2019		2018		2017
Expected volatility	30.9% – 41.7%		25.3% – 32.0%		34.5% – 44.5%
Expected term (in years)	0.5		0.5		0.5
Risk-free interest rate	2.09% – 2.50%		1.11% – 1.45%		0.53% – 0.91%
Dividend yield	—%		—%		—%
Grant date fair value per share	$126.29 – $167.80		$98.39 – $100.52		$69.00 – $79.30

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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.

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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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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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