NOTE I – Stock-Based Compensation

Non-Qualified Stock Options

During the three months ended August 31, 2017, we granted non-qualified stock options covering a total of 90,200 common shares under our stock-based compensation plans. The option price of $47.76 per share was equal to the market price of the underlying common shares at the grant date. The fair value of these stock options, based on the Black-Scholes option-pricing model, calculated at the grant date, was $14.99 per share. The calculated pre-tax stock-based compensation expense for these stock options, after an estimate for forfeitures, is $1,203,000 and will be recognized on a straight-line basis over the three-year vesting period. The following assumptions were used to value these stock options:


Dividend yield	1.81	%
Expected volatility	36.65	%
Risk-free interest rate	1.98	%
Expected term (years)	6.0

Expected volatility is based on the historical volatility of our common shares and the risk-free interest rate is based on the United States Treasury strip rate for the expected term of the stock options. The expected term was developed using historical exercise experience.

Service-Based Restricted Common Shares

During the three months ended August 31, 2017, we granted an aggregate of 122,400 service-based restricted common shares under our stock-based compensation plans. The fair value of these restricted common shares was equal to the weighted average closing market price of the underlying common shares on the respective dates of grant, or $47.81 per share. The calculated pre-tax stock-based compensation expense for these restricted common shares, after an estimate for forfeitures, is $5,208,000 and will be recognized on a straight-line basis over the three-year service-based vesting period.

Performance Share Awards

We have awarded performance shares to certain key employees under our stock-based compensation plans. These performance shares are earned based on the level of achievement with respect to corporate targets for cumulative corporate economic value added, earnings per share growth and, in the case of business unit executives, business unit operating income targets for the three-year periods ending May 31, 2018, 2019 and 2020. These performance share awards will be paid, to the extent earned, in common shares of the Company in the fiscal quarter following the end of the applicable three-year performance period. The fair values of our performance shares are determined by the closing market prices of the underlying common shares at the respective grant dates of the performance shares and the pre-tax stock-based compensation expense is based on our periodic assessment of the probability of the targets being achieved and our estimate of the number of common shares that will ultimately be issued. During the three months ended August 31, 2017, we granted performance share awards covering an aggregate of 54,700 common shares (at target levels). The calculated pre-tax stock-based compensation expense for these performance shares is $2,768,000 and will be recognized over the three-year performance period.