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Income Taxes (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Nov. 30, 2017 | Nov. 30, 2017 | Nov. 30, 2017 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015 | Nov. 30, 2014
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income Tax Credits and Adjustments |  | $ 4,900,000 |  |  | $ 15,200,000 | $ 5,600,000 |
Effective Income Tax Rate Reconciliation, Percent |  |  | (37.70%) | (35.00%) | (29.30%) | (33.40%) |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Income tax expense |  | (109,400,000) |  |  | $ (43,700,000) | $ (42,400,000) |
Deferred income taxes |  | 105,348,000 |  |  | 43,211,000 | 43,036,000 |
Deferred Tax Assets, Net | $ (657,200,000) | (657,200,000) | $ (657,200,000) | $ (657,200,000) | (763,800,000) |  |
Net Increase in valuation allowance recorded against net deferred tax assets |  | 1,200,000 |  |  | 13,000,000 | 3,400,000 |
Period for Carry forward of tax benefits related to deferred tax assets | 20 years |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Expired |  |  |  |  | 500,000 |  |
Deferred Tax Assets, Tax Credit Carryforwards | $ 112,400,000 | 112,400,000 | 112,400,000 | 112,400,000 |  |  |
Accumulated Deferred Investment Tax Credit | 3,200,000 | 3,200,000 | 3,200,000 | 3,200,000 |  |  |
Valuation allowance | (23,600,000) | (23,600,000) | (23,600,000) | (23,600,000) | (24,800,000) |  |
Unrecognized tax benefits that if recognized would affect the Company's annual effective tax rate | 100,000 | 100,000 | 100,000 | 100,000 | 100,000 | 100,000 |
Total accrued interest and penalties related to unrecognized income tax benefits | 0 | 0 | 0 | 0 | 0 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 0 | 0 | 0 | 0 | 0 |  |
Unrecognized Tax Benefits | 56,000 | 56,000 | 56,000 | 56,000 | 56,000 | 56,000 | $ 206,000
Income taxes refunded |  | 202,000 |  |  | 550,000 | $ 11,000 |
Valuation allowance against net deferred tax assets | 23,600,000 | 23,600,000 | 23,600,000 | 23,600,000 | 24,800,000 |  |
Total deferred tax assets | 791,271,000 | 791,271,000 | 791,271,000 | 791,271,000 | $ 921,588,000 |  |
Gross Unrecognized Tax Benefits Including Interest and Penalties | $ 100,000 | 100,000 | 100,000 | 100,000 |  |  |
Maximum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2037 |  |  |  |  |  |
Anticipated Decrease in Unrecognized Tax Benefit During Twelve Months Following Current Reporting Date | $ 100,000 | 100,000 | 100,000 | 100,000 |  |  |
Minimum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date | Dec. 31, 2026 |  |  |  |  |  |
Anticipated Decrease in Unrecognized Tax Benefit During Twelve Months Following Current Reporting Date | $ 0 | 0 | 0 | 0 |  |  |
Tax Credit Carryforward, Expiring in 2038 [Domain] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Future Income From Continuing Operations Before Income Taxes |  | 1,600,000,000 |  |  |  |  |
Investment Tax Credit Carryforward, Expiration in 2026 [Member] |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Accumulated Deferred Investment Tax Credit | 2,400,000 | 2,400,000 | 2,400,000 | 2,400,000 |  |  |
Investment Tax Credit Carryforward, Expiration in 2027 [Member] |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Accumulated Deferred Investment Tax Credit | 800,000 | 800,000 | 800,000 | 800,000 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards | $ 130,400,000 | 130,400,000 | 130,400,000 | 130,400,000 |  |  |
State and Local Jurisdiction [Member] | Maximum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2037 |  |  |  |  |  |
State and Local Jurisdiction [Member] | Minimum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2018 |  |  |  |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards | $ 105,800,000 | $ 105,800,000 | $ 105,800,000 | $ 105,800,000 |  |  |
Internal Revenue Service (IRS) [Member] | Maximum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2033 |  |  |  |  |  |
Internal Revenue Service (IRS) [Member] | Minimum |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2031 |  |  |  |  |  |

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