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Term Loan and Line of Credit (Narrative) (Details) - Credit Agreement [Member] - USD ($)
3 Months Ended 6 Months Ended
May 31, 2016
May 31, 2015
May 31, 2016
May 31, 2015
Dec. 02, 2014
Line of Credit Facility [Line Items]          
Term loan         $ 150,000,000
Unsecured credit facility         150,000,000
Additional borrowing capacity available         75,000,000
Fair value of term loan $ 138,800,000   $ 138,800,000    
Due in next 12 months 11,300,000   11,300,000    
Principal payments for years one and two 1,900,000   1,900,000    
Principal payments for years three and four 3,800,000   3,800,000    
Principal payments for years five and thereafter 5,600,000   $ 5,600,000    
Interest rate during period (as a percent)     2.19%    
Debt issuance cost 1,800,000   $ 1,800,000    
Amortization of debt issuance costs 100,000 $ 100,000 200,000 $ 200,000  
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   500,000    
Revolving line of credit [Member]          
Line of Credit Facility [Line Items]          
Line of credit facility outstanding amount $ 0   $ 0    
Swing line loans [Member]          
Line of Credit Facility [Line Items]          
Unsecured credit facility         $ 25,000,000.0