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Stock-Based Compensation | 9 Months Ended
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Aug. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation | Stock-Based Compensation We measure and recognize compensation expense associated with our grant of equity-based awards in accordance with Accounting Standards Codification Topic No. 718, “Compensation — Stock Compensation” (“ASC 718”). ASC 718 requires that companies measure and recognize compensation expense at an amount equal to the fair value of share-based payments granted under compensation arrangements over the vesting period. Stock Options. In accordance with ASC 718, we estimate the grant-date fair value of stock options using the Black-Scholes option-pricing model, which takes into account assumptions regarding an expected dividend yield, a risk-free interest rate, an expected volatility factor for the market price of our common stock and an expected term of the stock options. The following table summarizes stock option transactions for the nine months ended August 31, 2013:
| Options |  | Weighted Average Exercise Price
Options outstanding at beginning of period | 10,105,546 |  |  | $ | 21.27 |
Granted | — |  |  | — |
Exercised | (115,208 | ) |  | 13.51 |
Cancelled | — |  |  | — |
Options outstanding at end of period | 9,990,338 |  |  | $ | 21.36 |
Options exercisable at end of period | 8,476,681 |  |  | $ | 23.81 |
As of August 31, 2013, the weighted average remaining contractual life of stock options outstanding and stock options exercisable was 5.6 years and 5.2 years, respectively. There was $.5 million of total unrecognized compensation expense related to unvested stock option awards as of August 31, 2013. For the three months ended August 31, 2013 and 2012, stock-based compensation expense associated with stock options totaled $.4 million and $1.1 million, respectively. For the nine months ended August 31, 2013 and 2012, stock-based compensation expense associated with stock options totaled $1.2 million and $3.5 million, respectively. The aggregate intrinsic value of stock options outstanding was $24.7 million at August 31, 2013. The aggregate intrinsic value of stock options exercisable was $11.9 million at August 31, 2013. (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, PSUs and phantom shares to various employees. We recognized total compensation expense of $1.1 million for the three months ended August 31, 2013 and $.4 million for the three months ended August 31, 2012 related to restricted stock, PSUs and phantom shares. We recognized total compensation expense of $2.4 million for the nine months ended August 31, 2013 and $1.2 million for the nine months ended August 31, 2012 related to these stock-based awards.

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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 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 3: 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=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65, A240 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6418621&loc=d3e17540-113929 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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