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STOCK-BASED COMPENSATION
 9 Months Ended
Feb. 28, 2023
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 and stock awards, including restricted stock and restricted stock units. Restricted stock units include both time-vesting restricted stock units (RSUs) as well as performance-based restricted stock units (PSUs). 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, 2022 for additional 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 FEBRUARY 28,NINE MONTHS ENDED FEBRUARY 28,
(Dollars in millions)
2023202220232022
Stock options(1)
$78 $75 $232 $221 
ESPPs20 15 53 44 
Restricted stock and restricted stock units(1)(2)
94 71 271 202 
TOTAL STOCK-BASED COMPENSATION EXPENSE$192 $161 $556 $467 
(1)Expense for stock options includes the expense associated with stock appreciation rights. Accelerated stock option expense is primarily recorded for employees meeting certain retirement eligibility requirements.
(2)Restricted stock units include RSUs and PSUs.
The income tax benefit related to stock-based compensation expense was $22 million and $34 million for the three months ended February 28, 2023 and 2022, respectively, and $44 million and $307 million for the nine months ended February 28, 2023 and 2022, respectively, and reported within Income tax expense.
STOCK OPTIONS
The weighted average fair value per share of stock options granted during the nine months ended February 28, 2023 and 2022, computed as of the grant date using the Black-Scholes pricing model, was $31.31 and $37.53, respectively. The weighted average assumptions used to estimate these fair values were as follows:
 NINE MONTHS ENDED FEBRUARY 28,
20232022
Dividend yield0.9 %0.8 %
Expected volatility27.1 %24.9 %
Weighted average expected life (in years)5.85.8
Risk-free interest rate3.3 %0.9 %
Expected volatilities are based on an analysis of 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 stock 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 stock options.
As of February 28, 2023, the Company had $502 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 RSUs granted for the nine months ended February 28, 2023 and 2022, computed as of the grant date, was $110.27 and $158.94, respectively.
The weighted average fair value per share of PSUs granted for the nine months ended February 28, 2023 and 2022, computed as of the grant date, was $134.71 and $250.52, respectively.
As of February 28, 2023, the Company had $727 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 2.5 years.