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Stock-Based Compensation
 9 Months Ended
Feb. 28, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Stock-Based Compensation
NOTE 7 — STOCK-BASED COMPENSATION
STOCK-BASED COMPENSATION
The NIKE, Inc. Stock Incentive Plan (the “Stock Incentive Plan”) provides for the issuance of up to 798 million previously unissued shares of Class B Common Stock in connection with equity 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. In addition to the Stock Incentive Plan, the Company gives employees the right to purchase shares at a discount from the market price under employee stock purchase plans (ESPPs). Refer to Note 11 — Common Stock and Stock-Based Compensation of the Annual Report on Form 10-K for the fiscal year ended May 31, 2020 for further information.
The following table summarizes the Company's total stock-based compensation expense recognized in Cost of sales or Operating overhead expense, as applicable: 
 THREE MONTHS ENDED NINE MONTHS ENDED
(Dollars in millions)
FEBRUARY 28, 2021FEBRUARY 29, 2020FEBRUARY 28, 2021FEBRUARY 29, 2020
Stock options(1)
$73 $64 $250 $170 
ESPPs15 11 50 35 
Restricted stock(1)
54 38 167 98 
TOTAL STOCK-BASED COMPENSATION EXPENSE$142 $113 $467 $303 
(1)Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option and restricted stock expense is primarily recorded for employees meeting certain retirement eligibility requirements and certain employees impacted by the Company's organizational realignment. For more information see Note 14 — Restructuring.
The income tax benefit related to stock-based compensation expense was $67 million for both the three months ended February 28, 2021 and February 29, 2020 and $256 million and $181 million for the nine months ended February 28, 2021 and February 29, 2020, respectively.
STOCK OPTIONS
The weighted average fair value per share of the options granted during the nine months ended February 28, 2021 and February 29, 2020, computed as of the grant date using the Black-Scholes pricing model, was $26.75 and $18.71, respectively. The weighted average assumptions used to estimate these fair values were as follows:
 NINE MONTHS ENDED
FEBRUARY 28, 2021FEBRUARY 29, 2020
Dividend yield0.9 %1.0 %
Expected volatility27.3 %23.0 %
Weighted average expected life (in years)6.06.0
Risk-free interest rate0.4 %1.5 %
Expected volatilities are based on the historical volatility of the Company's common stock, the implied volatility in market traded options on the Company's common stock with a term greater than one year, as well as 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.
As of February 28, 2021, the Company had $492 million of unrecognized compensation costs from stock options, net of estimated forfeitures, to be recognized in Cost of sales or Operating overhead expense, as applicable, over a weighted average remaining period of 2.6 years.
RESTRICTED STOCK AND RESTRICTED STOCK UNITS
The weighted average fair value per share of restricted stock and restricted stock units granted for the nine months ended February 28, 2021 and February 29, 2020, computed as of the grant date, was $112.44 and $88.28, respectively. As of February 28, 2021, the Company had $485 million of unrecognized compensation costs from restricted stock and restricted stock units, net of estimated forfeitures, to be recognized in Cost of sales or Operating overhead expense, as applicable, over a weighted average remaining period of 2.7 years.