Stock-Based Compensation |
6 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2018 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Stock-Based Compensation | Stock-Based Compensation Stock Options. We estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model. The following table summarizes stock option transactions for the six months ended May 31, 2018:
As of May 31, 2018, the weighted average remaining contractual life of stock options outstanding and stock options exercisable was 3.8 years and 3.3 years, respectively. There was $.5 million of total unrecognized compensation expense related to unvested stock option awards as of May 31, 2018 that is expected to be recognized over a weighted average period of 1.0 year. For the three months ended May 31, 2018 and 2017, stock-based compensation expense associated with stock options totaled $.2 million and $.3 million, respectively. For the six months ended May 31, 2018 and 2017, stock-based compensation expense associated with stock options totaled $.4 million and $1.1 million, respectively. The aggregate intrinsic values of stock options outstanding and stock options exercisable were $91.8 million and $81.8 million, respectively, at May 31, 2018. (The intrinsic value of a stock option is the amount by which the market value of a share of the underlying common stock exceeds the exercise price of the stock option.) Other Stock-Based Awards. From time to time, we grant restricted stock and PSUs to various employees as a compensation benefit. We recognized total compensation expense of $4.8 million and $3.6 million for the three months ended May 31, 2018 and 2017, respectively, related to restricted stock and PSUs. We recognized total compensation expense of $8.4 million and $5.9 million for the six months ended May 31, 2018 and 2017, respectively, related to restricted stock and PSUs. |