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Term Loan and Line of Credit (Narrative) (Details) - Credit Agreement - USD ($)
3 Months Ended 6 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Apr. 30, 2019
Nov. 20, 2017
Line of Credit Facility [Line Items]            
Additional borrowing capacity available         $ 185,000,000.0  
Interest rate of credit facilities 4.06%   4.06%      
Principal repayments, option one $ 1,900,000   $ 1,900,000      
Principal repayments, option two 3,800,000   3,800,000      
Principal repayments, option three 5,600,000   5,600,000      
Principal repayments, option four 7,500,000   7,500,000      
Principal repayments, three payment schedules 9,400,000   9,400,000      
Debt issuance cost 1,600,000   1,600,000      
Unamortized debt issuance costs 1,200,000   1,200,000      
Amortization of debt issuance costs $ 100,000 $ 100,000 $ 200,000 $ 200,000    
Percentage of capital stock of domestic subsidiaries 100.00%   100.00%      
Percentage of capital stock of first-tier foreign subsidiaries 65.00%   65.00%      
Revolving line of credit            
Line of Credit Facility [Line Items]            
Term loan         301,000,000.0  
Unsecured credit facility         100,000,000.0  
Additional borrowing capacity available         125,000,000.0  
Fair value of term loan $ 301,000,000.0   $ 301,000,000.0      
Due in next 12 months 7,500,000   7,500,000      
Line of credit facility outstanding amount 0   0     $ 0
Swing line loans            
Line of Credit Facility [Line Items]            
Term loan         25,000,000.0  
Letter of credit            
Line of Credit Facility [Line Items]            
Term loan         $ 25,000,000.0  
Line of credit facility outstanding amount $ 1,800,000   $ 1,800,000     $ 1,300,000
Minimum            
Line of Credit Facility [Line Items]            
Commitment fee percentage     0.25%      
Minimum | Eurodollar            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities 1.50%   1.50%      
Minimum | Base Rate            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities 0.50%   0.50%      
Maximum            
Line of Credit Facility [Line Items]            
Commitment fee percentage     0.35%      
Maximum | Eurodollar            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities 2.00%   2.00%      
Maximum | Base Rate            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities 1.00%   1.00%