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Employee Benefit and Stock Plans (Details Textual) (USD $) | 12 Months Ended |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |
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Nov. 30, 2011 Year Person | Nov. 30, 2010 | Nov. 30, 2009 | Oct. 06, 2011 | Oct. 07, 2010 | Apr. 01, 2010 | Jan. 21, 2010 | Jul. 12, 2007 | Nov. 30, 2011 Saving Plan [Member] | Nov. 30, 2010 Saving Plan [Member] | Nov. 30, 2009 Saving Plan [Member] | Nov. 30, 2009 Maximum [Member] | Nov. 30, 2009 Minimum [Member] | Nov. 30, 2011 1988 Employee Stock Plan [Member] | Nov. 30, 2011 August 2010 Exchange Offer [Member] Person | Nov. 30, 2011 November 2010 Exchange Offer [Member] Person | Nov. 30, 2008 Phantom [Member] | Nov. 30, 2011 Phantom [Member] | Nov. 30, 2010 Phantom [Member] | Nov. 30, 2009 Phantom [Member] | Nov. 30, 2011 2010 Equity Incentive Plan [Member] | Apr. 07, 2011 2010 Equity Incentive Plan [Member] | Apr. 01, 2010 2010 Equity Incentive Plan [Member] | Nov. 30, 2011 Stock Appreciation Rights (SARs) [Member] | Nov. 30, 2010 Stock Appreciation Rights (SARs) [Member] | Nov. 30, 2009 Stock Appreciation Rights (SARs) [Member]
Employee Benefit and Stock Plans (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cost related to saving plan |  |  |  |  |  |  |  |  | $ 2,800,000 | $ 3,200,000 | $ 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets invested in funds consisting common stock | 4.00% | 5.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance of stock based awards to employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 |  |  |
Number of additional shares authorized for issuance of stock based awards to employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Grant of stock option, Reduce the plan share capacity |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based payments award terms of Award |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  | 10 years |  |  |  |  |
Number of Employees to purchase Company's common stock in exchange for corresponding grants of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock per share for 18 eligible employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.90 |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock per share for 1 eligible employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.25 |  |  |  |  |  |  |  |  |  |  |
Purchase price of common stock per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28.10 |  |  |  |  |  |  |  |  |  |
Purchase price of common stock per share for 7 eligible employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.19 |  |  |  |  |  |  |  |  |  |
Shares purchase per employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42,293 | 193,535 |  |  |  |  |  |  |  |  |  |
Number of eligible employees returned SARs related to the exchange offer to the company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 | 9 |  |  |  |  |  |  |  |  |  |
SARs returned to the company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,116,030 | 925,705 |  |  |  |  |  |  |  |  |  |
Common Stock Purchase by Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,073,737 | 732,170 |  |  |  |  |  |  |  |  |  |
Performance shares vested and become unrestricted |  |  |  |  |  |  |  |  |  |  |  | 150.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period of vesting shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
SARs vest in equal annual installments period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Outstanding at end of year, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,556 | 268,762 | 926,705 |  |  |  | 29,939 | 37,517 | 2,292,537
Number of employees to whom stock options granted in exchange for stock appreciation rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |
Number of Employees to whom one grant of stock options to purchase Company's common stock | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Benefit and Stock Plan (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's common stock at the purchase price per share |  |  |  | $ 6.32 | $ 11.06 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant-date fair value per performance-based stock option |  |  |  | $ 2.54 | $ 4.59 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average fair value of stock options granted | $ 2.56 | $ 2.81 | $ 7.16 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense related to stock option grants | 5,900,000 | 5,800,000 | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total unrecognized stock-based compensation expense related to unvested stock option awards | 5,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expense expected to be recognized over a weighted average period | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits from stock-based compensation | 0 | 583,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relinquished of restricted common stock to the company by former chairman and chief executive officer |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance shares awarded to president and chief executive officer subject to term plans |  |  |  |  |  |  |  | 54,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock options exercisable | 0 | 100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock options outstanding | 1,700,000 | 300,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant of restricted stock, Reduce the Plan share capacity |  |  |  |  |  | $ 1.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for shareholder return |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Relinquished of stock options to the company by former chairman and chief executive officer |  |  | 3,011,452 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock option exercised | 0 | 100,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total grant-date fair value of performance shares recognized over the service period |  |  | 0 |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-based stock options to purchase an aggregate shares of company's common stock |  |  |  | 365,000 | 260,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance shares vesting restrictions lapsed |  |  |  |  |  |  | 48,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expense related to various stock | 1,200,000 | 700,000 | 8,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock held in trust | 10,884,151 | 11,082,723 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum period of restriction imposed on share grant lapse | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum period of restriction imposed on share grant lapse | 8 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock market price |  |  |  | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value per performance based stock option |  |  |  | $ 0.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax shortfall from cancellation of stock awards | $ 1,000,000 | $ 2,800,000 | $ 4,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph h -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-15 -Paragraph 3 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11374-113907 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(a) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(2)(b) -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. + References Reference 1: 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 + Details
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- Definition The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(2) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph c(1) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(1) -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 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 + Details
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