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Income Taxes (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 28, 2018
Feb. 28, 2018
Feb. 28, 2018
Feb. 28, 2017
Nov. 30, 2022
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Income Tax Expense (Benefit), Continuing Operations [Abstract]                
Income tax expense     $ (117,300,000) $ (7,200,000)        
Impact of Tax Reform     111,200,000          
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount     (6,100,000)          
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Rate Provisional Income Tax Expense Benefit     107,900,000          
Deferred Tax Assets, Tax Credit Carryforwards $ 50,000,000 $ 50,000,000 50,000,000          
Income Tax Credits and Adjustments     4,000,000 $ 1,100,000        
Unrecognized Tax Benefits 100,000 100,000 100,000         $ 100,000
Net (increase) reduction in valuation allowance     (3,300,000)          
Deferred Tax Liabilities, Other 0 0 0          
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     (2,200,000)          
Valuation allowance 26,900,000 26,900,000 26,900,000         23,600,000
Income Tax Contingency [Line Items]                
Deferred Tax Assets, Gross $ 543,500,000 $ 543,500,000 543,500,000         $ 657,200,000
Future Effective Federal Income Tax Rate Percent (26.713%)              
Effective Income Tax Rate Reconciliation, Percent (13.20%) 254.80%   33.60%        
Minimum [Member]                
Income Tax Contingency [Line Items]                
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0 $ 0 0          
Maximum [Member]                
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          
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 100,000 $ 100,000 $ 100,000          
Scenario, Forecast [Member]                
Income Tax Contingency [Line Items]                
Effective Income Tax Rate Reconciliation, Deduction, Percent           50.00%    
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent         6.60%      
Future Effective Federal Income Tax Rate Percent             (22.20%)