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Stock-Based Compensation | 6 Months Ended
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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:
| Options |  | Weighted Average Exercise Price
Options outstanding at beginning of period | 9,265,240 |  |  | $ | 17.64 |
Granted | — |  |  | — |
Exercised | (397,062 | ) |  | 12.02 |
Cancelled | (16,208 | ) |  | 15.47 |
Options outstanding at end of period | 8,851,970 |  |  | $ | 17.90 |
Options exercisable at end of period | 7,910,570 |  |  | $ | 18.16 |
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.

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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 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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