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Income Taxes (Narrative) (Details) (USD $)
 3 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Nov. 30, 2014
Valuation Allowance [Line Items]      
Provision (benefit) for income taxes $ 59,726,000us-gaap_IncomeTaxExpenseBenefit $ 45,911,000us-gaap_IncomeTaxExpenseBenefit  
Effective Income Tax Rate, Continuing Operations 34.19%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.02%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Deferred tax assets, net of valuation allowance 286,100,000us-gaap_DeferredTaxAssetsNet   313,800,000us-gaap_DeferredTaxAssetsNet
Deferred tax assets, valuation allowance 8,000,000us-gaap_DeferredTaxAssetsValuationAllowance   8,029,000us-gaap_DeferredTaxAssetsValuationAllowance
Deferred tax assets, operating loss carryforwards 2,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards   2,007,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred tax assets, operating loss carryforwards, state and local 111,000,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal   113,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Unrecognized tax benefits 7,300,000us-gaap_UnrecognizedTaxBenefits   7,257,000us-gaap_UnrecognizedTaxBenefits
Income tax penalties and interest accrued 31,900,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   31,500,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Income tax penalties and interest accrued recorded during the period $ 400,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense    
Federal Net Operating Loss Carryforwards [Member]      
Valuation Allowance [Line Items]      
Net Operating Loss Carryforward, Term 20 years    
State Net Operating Loss Carryforwards [Member]      
Valuation Allowance [Line Items]      
Net Operating Loss Carryforward, Term 5 years    
State Net Operating Loss Carryforwards High End Range [Member]      
Valuation Allowance [Line Items]      
Net Operating Loss Carryforward, Term 20 years