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Term Loan and Line of Credit (Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 05, 2020
Oct. 31, 2020
Nov. 30, 2020
Nov. 30, 2019
Nov. 30, 2018
Apr. 30, 2019
Line of Credit Facility [Line Items]            
Due in next 12 months     $ 18,812,000      
Revolving Line of Credit            
Line of Credit Facility [Line Items]            
Proceeds from lines of credit   $ 98,500,000        
Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities     1.81%      
Debt, weighted average interest rate     2.41%      
Debt issuance cost     $ 1,600,000      
Unamortized debt issuance costs     1,200,000      
Amortization of debt issuance costs     $ 600,000 $ 400,000 $ 400,000  
Percentage of capital stock of domestic subsidiaries     100.00%      
Percentage of capital stock of first-tier foreign subsidiaries     65.00%      
Credit Agreement | Secured Debt            
Line of Credit Facility [Line Items]            
Term loan           $ 301,000,000.0
Additional borrowing capacity available           185,000,000.0
Line of credit facility outstanding amount     $ 286,000,000.0      
Due in next 12 months     18,800,000      
Principal repayments, option one     1,900,000      
Principal repayments, option two     3,800,000      
Principal repayments, option three     5,600,000      
Principal repayments, option four     7,500,000      
Principal repayments, three payment schedules     9,400,000      
Credit Agreement | Revolving Line of Credit            
Line of Credit Facility [Line Items]            
Unsecured credit facility           100,000,000.0
Additional borrowing capacity available           125,000,000.0
Proceeds from lines of credit $ 98,500,000          
Line of credit facility outstanding amount     98,500,000      
Credit Agreement | Swing Line Loans            
Line of Credit Facility [Line Items]            
Term loan           25,000,000.0
Credit Agreement | Letter of Credit            
Line of Credit Facility [Line Items]            
Term loan           $ 25,000,000.0
Line of credit facility outstanding amount     $ 2,100,000      
Minimum | Credit Agreement | Revolving Line of Credit            
Line of Credit Facility [Line Items]            
Commitment fee percentage     0.25%      
Minimum | Eurodollar | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities     1.50%      
Minimum | Base Rate | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities     0.50%      
Maximum | Credit Agreement | Revolving Line of Credit            
Line of Credit Facility [Line Items]            
Commitment fee percentage     0.35%      
Maximum | Eurodollar | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities     2.00%      
Maximum | Base Rate | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities     1.00%