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Term Loan and Line of Credit (Narrative) (Details) - USD ($)
 3 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Dec. 31, 2014
Dec. 02, 2014
Line of Credit Facility [Line Items]        
Unamortized debt issuance costs $ 1,000,000      
Unamortized debt issuance costs deducted from current portion of long-term debt 400,000      
Unamortized debt issuance costs deducted from long-term debt 600,000      
Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Term loan 150,000,000     $ 150,000,000
Unsecured credit facility 150,000,000      
Additional borrowing capacity available 75,000,000      
Fair value of term loan 131,300,000      
Due in next 12 months 15,000,000      
Principal payments for years one and two 1,900,000      
Principal payments for years three and four 3,800,000      
Principal payments for years five and thereafter $ 5,600,000      
Interest rate at period end (as a percent) 2.56%      
Debt issuance cost $ 1,800,000      
Amortization of debt issuance costs 100,000 $ 100,000    
Credit Agreement [Member] | Swing line loans [Member]        
Line of Credit Facility [Line Items]        
Unsecured credit facility     $ 25,000,000.0  
Credit Agreement [Member] | Letter of credit [Member]        
Line of Credit Facility [Line Items]        
Unsecured credit facility     $ 25,000,000.0  
Line of credit facility outstanding amount 500,000      
Credit Agreement [Member] | Revolving line of credit [Member]        
Line of Credit Facility [Line Items]        
Line of credit facility outstanding amount $ 0