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Stock-Based Compensation | 3 Months Ended
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Feb. 28, 2017
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, 2017:
| Options |  | Weighted Average Exercise Price
Options outstanding at beginning of period | 12,731,545 |  |  | $ | 18.95 |
Granted | — |  |  | — |
Exercised | (74,854 | ) |  | 8.85 |
Cancelled | (124,090 | ) |  | 19.46 |
Options outstanding at end of period | 12,532,601 |  |  | $ | 19.01 |
Options exercisable at end of period | 10,307,866 |  |  | $ | 19.78 |
As of February 28, 2017, the weighted average remaining contractual life of stock options outstanding and stock options exercisable was 4.3 years and 3.3 years, respectively. There was $3.5 million of total unrecognized compensation expense related to unvested stock option awards as of February 28, 2017 that is expected to be recognized over a weighted average period of 1.5 years. For the three months ended February 28, 2017 and February 29, 2016, stock-based compensation expense associated with stock options totaled $.8 million and $.9 million, respectively. The aggregate intrinsic values of stock options outstanding and stock options exercisable were $38.4 million and $33.3 million, respectively, at February 28, 2017. (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 $2.3 million for the three months ended February 28, 2017 and $1.9 million for the three months ended February 29, 2016 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 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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