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Common Stock and Stock-Based Compensation | 9 Months Ended
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Feb. 29, 2016
Share-based Compensation [Abstract] |
Common Stock and Stock-Based Compensation |
NOTE 8 — Common Stock and Stock-Based Compensation
The authorized number of shares of Class A Common Stock, no par value, and Class B Common Stock, no par value, are 400 million and 2,400 million, respectively. Each share of Class A Common Stock is convertible into one share of Class B Common Stock. Voting rights of Class B Common Stock are limited in certain circumstances with respect to the election of directors. There are no differences in the dividend and liquidation preferences or participation rights of the Class A and Class B common shareholders. The NIKE, Inc. Stock Incentive Plan (the "Stock Incentive Plan") provides for the issuance of up to 718 million previously unissued shares of Class B Common Stock in connection with stock options and other awards granted under the Stock Incentive Plan. The Stock Incentive Plan authorizes the grant of non-statutory stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance-based awards. The exercise price for stock options and stock appreciation rights may not be less than the fair market value of the underlying shares on the date of grant. A committee of the Board of Directors administers the Stock Incentive Plan. The committee has the authority to determine the employees to whom awards will be made, the amount of the awards and the other terms and conditions of the awards. Substantially all stock option grants outstanding under the Stock Incentive Plan are granted in the first quarter of each fiscal year, vest ratably over four years and expire 10 years from the date of grant. In addition to the Stock Incentive Plan, the Company gives employees the right to purchase shares at a discount to the market price under employee stock purchase plans (“ESPPs”). Employees are eligible to participate through payroll deductions of up to 10% of their compensation. At the end of each six-month offering period, shares are purchased by the participants at 85% of the lower of the fair market value at the beginning or the end of the offering period. The Company accounts for stock-based compensation by estimating the fair value of options granted under the Stock Incentive Plan and employees’ purchase rights under the ESPPs using the Black-Scholes option pricing model. The Company recognizes this fair value as Operating overhead expense over the vesting period using the straight-line method. The following table summarizes the Company’s total stock-based compensation expense recognized in Operating overhead expense:
|  | Three Months Ended |  | Nine Months Ended
(In millions) |  | February 29, 2016 |  | February 28, 2015 |  | February 29, 2016 |  | February 28, 2015
Stock options(1) |  | $ | 44 |  |  | $ | 35 |  |  | $ | 128 |  |  | $ | 100 |
ESPPs |  | 7 |  |  | 5 |  |  | 22 |  |  | 17 |
Restricted stock |  | 9 |  |  | 8 |  |  | 26 |  |  | 23 |
TOTAL STOCK-BASED COMPENSATION EXPENSE |  | $ | 60 |  |  | $ | 48 |  |  | $ | 176 |  |  | $ | 140 |
(1) | Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is recorded for employees eligible for accelerated stock option vesting upon retirement. Accelerated stock option expense was $8 million and $5 million for the three month periods ended February 29, 2016 and February 28, 2015, respectively, and $22 million and $14 million for the nine month periods ended February 29, 2016 and February 28, 2015, respectively.
As of February 29, 2016, the Company had $289 million of unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized in Operating overhead expense over a weighted average remaining period of 2.3 years. The weighted average fair value per share of the options granted during the nine month periods ended February 29, 2016 and February 28, 2015, computed as of the grant date using the Black-Scholes pricing model, was $12.67 and $8.47, respectively. The weighted average assumptions used to estimate these fair values are as follows:
|  | Nine Months Ended
|  | February 29, 2016 |  | February 28, 2015
Dividend yield |  | 1.0 | % |  | 1.2 | %
Expected volatility |  | 23.6 | % |  | 23.6 | %
Weighted average expected life (in years) |  | 5.8 |  |  | 5.8 |
Risk-free interest rate |  | 1.7 | % |  | 1.7 | %
The Company estimates the expected volatility based on the implied volatility in market traded options on the Company’s common stock with a term greater than one year, along with other factors. The weighted average expected life of options is based on an analysis of historical and expected future exercise patterns. The interest rate is based on the U.S. Treasury (constant maturity) risk-free rate in effect at the date of grant for periods corresponding with the expected term of the options.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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