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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Feb. 28, 2018 | Nov. 30, 2022 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016 | Nov. 30, 2015
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact of Tax Reform | $ 1,300,000 |  |  |  |  |  | $ 112,458,000 |  | $ 0 | $ 0 |
Impact of Tax Return, re-measurement of deferred tax assets |  |  |  |  |  |  | 106,700,000 |  |  |  |
Provisional impact of Tax Refrom |  | $ 111,200,000 |  |  |  |  |  |  |  |  |
Income Tax Credits and Adjustments |  |  |  |  |  |  | 10,700,000 |  | 4,900,000 | 15,200,000 |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  |  | (2,000,000) |  | $ (1,200,000) | $ (12,982,000) |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  | (53.70%) |  |  | (37.70%) | (29.30%) |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  | (197,600,000) |  | $ (109,400,000) | $ (43,700,000) |
Deferred Tax Assets, Net | (465,400,000) |  |  |  | $ (465,400,000) | $ (465,400,000) | (465,400,000) | $ (465,400,000) | (657,200,000) |  |
Net Increase in valuation allowance recorded against net deferred tax assets |  |  |  |  |  |  | (3,300,000) |  | 1,200,000 | 13,000,000 |
Period for Carry forward of tax benefits related to deferred tax assets |  |  |  |  | 20 years |  |  |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, State and Local, Expired |  |  |  |  |  |  | 1,200,000 |  |  | 500,000 |
Deferred Tax Assets, Tax Credit Carryforwards | 128,500,000 |  |  |  | $ 128,500,000 | 128,500,000 | 128,500,000 | 128,500,000 |  |  |
Accumulated Deferred Investment Tax Credit | 3,200,000 |  |  |  | 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) | (23,600,000) | (23,600,000) |  |
Unrecognized tax benefits that if recognized would affect the Company's annual effective tax rate | 0 |  |  |  | 0 | 0 | 0 | 0 | 100,000 | 100,000 |
Total accrued interest and penalties related to unrecognized income tax benefits | 0 |  |  |  | 0 | 0 | 0 | 0 | 0 |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 0 |  |  |  | 0 | 0 | 0 | 0 | 0 |  |
Unrecognized Tax Benefits | 0 |  |  |  | 0 | 0 | 0 | 0 | 56,000 | $ 56,000 | $ 56,000
Valuation allowance against net deferred tax assets | 23,600,000 |  |  |  | 23,600,000 | 23,600,000 | 23,600,000 | 23,600,000 | 23,600,000 |  |
Total deferred tax assets | 524,951,000 |  |  |  | 524,951,000 | $ 524,951,000 | 524,951,000 | $ 524,951,000 | $ 791,271,000 |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  | 1,000,000 |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 22.20% |  | 22.00% | 35.00% | 35.00% |
Deferred Tax Assets, Tax Credit Carryforwards | 231,100,000 |  |  |  | 231,100,000 | $ 231,100,000 | 231,100,000 | $ 231,100,000 | $ 208,841,000 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  |  |  | 0.20% |  |  | (0.30%) | (0.30%) |
Tax Cuts and Jobs Act of 2017, Other Tax Effect, Income Tax Expense (Benefit) |  |  |  |  |  |  | 2,500,000 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 1,000,000 |  |  |  | $ 1,000,000 | $ 1,000,000 | 1,000,000 | 1,000,000 |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  |  |  |  | Dec. 31, 2037 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward, Expiration Date |  |  |  |  | Dec. 31, 2026 |  |  |  |  |  |
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 | 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 | 800,000 |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  |  | (2,100,000) |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net Increase in valuation allowance recorded against net deferred tax assets |  |  |  |  |  |  | 3,300,000 |  |  |  |
Operating Loss Carryforwards | 115,800,000 |  |  |  | $ 115,800,000 | 115,800,000 | 115,800,000 | 115,800,000 |  |  |
State and Local Jurisdiction [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  |  |  | Dec. 31, 2038 |  |  |  |  |  |
State and Local Jurisdiction [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards, Expiration Date |  |  |  |  | Dec. 31, 2019 |  |  |  |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards | $ 5,600,000 |  |  |  | $ 5,600,000 | $ 5,600,000 | $ 5,600,000 | $ 5,600,000 |  |  |
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, 2032 |  |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Deduction, Percent |  |  |  | 50.00% |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards |  |  | $ 50,000,000 |  |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  | 6.60% |  |  |  |  |  |  |  |

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