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Common Stock and Stockholders' Equity | 3 Months Ended
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Apr. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Common Stock and Stockholders' Equity | Common Stock and Stockholders’ Equity Common Stock As of April 30, 2018, there were 146 million shares of Class A common stock and 69 million shares of Class B common stock outstanding. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting and conversion. Each share of Class A common stock is entitled to one vote per share and each share of Class B common stock is entitled to 10 votes per share. Each share of Class B common stock can be converted into a share of Class A common stock at any time at the option of the holder. Employee Equity Plans Our 2012 Equity Incentive Plan ("EIP") serves as the successor to our 2005 Stock Plan (together with the EIP, the "Stock Plans"). Pursuant to the terms of the EIP, the share reserve increased by 11 million shares in March 2018. As of April 30, 2018, we had approximately 67 million shares of Class A common stock available for future grants. We also have a 2012 Employee Stock Purchase Plan ("ESPP"). Under the ESPP, eligible employees are granted options to purchase shares at the lower of 85% of the fair market value of the stock at the time of grant or 85% of the fair market value at the time of exercise. Options to purchase shares are granted twice yearly on or about June 1 and December 1 and exercisable on or about the succeeding November 30 and May 31, respectively, of each year. As of April 30, 2018, approximately 7 million shares of Class A common stock were available for issuance under the ESPP. Restricted Stock Units The Stock Plans provide for the issuance of restricted stock units ("RSUs") to employees and non-employees. RSUs generally vest over four years. 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 |
As of April 30, 2018, there was a total of $1.4 billion in unrecognized compensation cost related to unvested RSUs, which is expected to be recognized over a weighted-average period of approximately 3.1 years. Performance-based Restricted Stock Units During fiscal 2018, 0.4 million shares of performance-based restricted stock units ("PRSUs") were granted to all employees other than executive management and included both service conditions and performance conditions related to company-wide goals. These performance conditions were met and the PRSUs vested on March 15, 2018. During the three months ended April 30, 2018, we recognized $7 million in compensation cost related to these PRSUs. Stock Options The Stock Plans provide for the issuance of incentive and nonstatutory options to employees and non-employees. Options issued under the Stock Plans generally are exercisable for periods not to exceed 10 years and generally vest over five years. 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 |
As of April 30, 2018, the unrecognized compensation cost related to unvested stock options was not material.

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- Definition The entire disclosure for accounts comprising shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income, and compensation-related costs for equity-based compensation. Includes, but is not limited to, disclosure of policies, compensation plan details, equity-based arrangements to obtain goods and services, deferred compensation arrangements, and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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