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Income Taxes (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Aug. 31, 2018
Aug. 31, 2017
Nov. 30, 2022
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Income Tax Expense (Benefit), Continuing Operations [Abstract]                
Income tax expense $ 27,200,000 $ 29,000,000 $ 165,500,000 $ 56,400,000        
Impact of Tax Reform     111,200,000          
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          
Income Tax Credits and Adjustments 3,000,000 $ 2,600,000 7,200,000 $ 3,800,000        
Unrecognized Tax Benefits 0   0         $ 100,000
Net (increase) reduction in valuation allowance     3,300,000          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount - Other     0          
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense (600,000)   (3,000,000)          
Valuation allowance 26,900,000   26,900,000         23,600,000
Income Tax Contingency [Line Items]                
Deferred Tax Assets, Gross $ 495,900,000   $ 495,900,000         $ 657,200,000
Effective Income Tax Rate Reconciliation, Percent 23.70% 36.60% 69.20% 36.90%        
Maximum [Member]                
Income Tax Contingency [Line Items]                
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation $ 1,000,000   $ 1,000,000          
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%)