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Stock-Based Compensation | 3 Months Ended
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Feb. 28, 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 three months ended February 28, 2018:
| Options |  | Weighted Average Exercise Price
Options outstanding at beginning of period | 9,265,240 |  |  | $ | 17.64 |
Granted | — |  |  | — |
Exercised | (268,954 | ) |  | 10.96 |
Cancelled | (16,208 | ) |  | 15.47 |
Options outstanding at end of period | 8,980,078 |  |  | $ | 17.85 |
Options exercisable at end of period | 8,038,678 |  |  | $ | 18.09 |
As of February 28, 2018, the weighted average remaining contractual life of stock options outstanding and stock options exercisable was 4.1 years and 3.6 years, respectively. There was $.7 million of total unrecognized compensation expense related to unvested stock option awards as of February 28, 2018 that is expected to be recognized over a weighted average period of 1.1 years. For the three months ended February 28, 2018 and 2017, stock-based compensation expense associated with stock options totaled $.2 million and $.8 million, respectively. The aggregate intrinsic values of stock options outstanding and stock options exercisable were $103.8 million and $92.5 million, respectively, at February 28, 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 $3.7 million and $2.3 million for the three months ended February 28, 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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