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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2019 | Feb. 28, 2019 | Nov. 30, 2018 | Feb. 28, 2018 | Nov. 30, 2022 | Nov. 30, 2019 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2018 | Nov. 30, 2017 | Nov. 30, 2016
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Impact of Tax Reform | $ (1,300,000) |  | $ (1,300,000) |  |  | $ 0 | $ (112,458,000) |  |  | $ 0 |
Impact of Tax Return, re-measurement of deferred tax assets |  |  |  |  |  | 1,900,000 | 106,700,000 |  |  |  |
Provisional impact of Tax Reform |  | $ 111,200,000 |  | $ 111,200,000 |  |  |  |  |  |  |
Income Tax Credits and Adjustments |  |  |  |  |  | (4,300,000) | 10,700,000 |  |  | 4,900,000 |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  | $ (4,400,000) | (2,000,000) |  |  | $ (1,200,000) |
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  | (22.80%) |  | (53.70%) |  | (37.70%) |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  | $ (79,400,000) | (197,600,000) |  |  | $ (109,400,000) |
Deferred Tax Assets, Net | (383,700,000) |  | (465,400,000) |  |  | (383,700,000) | (465,400,000) | $ (465,400,000) | $ (465,400,000) |  |
Net Increase in valuation allowance recorded against net deferred tax assets |  |  |  |  |  | $ (4,400,000) | (3,300,000) |  |  | 1,200,000 |
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 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards | 77,400,000 |  |  |  |  | $ 77,400,000 |  |  |  |  |
Valuation allowance | (19,200,000) |  | (23,600,000) |  |  | (19,200,000) | (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 | 0 | 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 | 0 | $ 56,000 | $ 56,000
Valuation allowance against net deferred tax assets | 19,200,000 |  | 23,600,000 |  |  | 19,200,000 | 23,600,000 | 23,600,000 | 23,600,000 |  |
Total deferred tax assets | 438,733,000 |  | 524,951,000 |  |  | 438,733,000 | 524,951,000 | $ 524,951,000 | $ 524,951,000 |  |
Share-based Payment Arrangement, Expense, Tax Benefit |  |  |  |  |  | $ (5,300,000) | (1,000,000.0) |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  | 21.00% |  | 22.20% | 22.00% | 35.00% |
Effective Income Tax Rate Reconciliation, Deduction, Percent |  |  |  |  |  | 50.00% |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards | 180,737,000 |  | $ 231,100,000 |  |  | $ 180,737,000 | 231,100,000 | $ 231,100,000 | $ 231,100,000 |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  |  |  | (0.20%) |  | 0.20% |  | (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 |  |  |  |  |
Tax Credit Carryforward, Expiring in 2038 [Domain] |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Future Income From Continuing Operations Before Income Taxes |  |  |  |  |  | 1,300,000,000 |  |  |  |  |
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 | $ 95,500,000 |  |  |  |  | $ 95,500,000 |  |  |  |  |
Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards |  |  |  |  | $ 50,000,000.0 |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  |  |  |  | 6.60% |  |  |  |  |  |

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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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