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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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