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Term Loan and Line of Credit (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 05, 2020
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2020
Aug. 31, 2019
Apr. 30, 2019
Line of Credit Facility [Line Items]            
Due in next 12 months   $ 18,813,000   $ 18,813,000    
Credit Agreement            
Line of Credit Facility [Line Items]            
Additional borrowing capacity available           $ 185,000,000.0
Interest rate of credit facilities   1.81%   1.81%    
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 $ 400,000 $ 300,000  
Percentage of capital stock of domestic subsidiaries   100.00%   100.00%    
Percentage of capital stock of first-tier foreign subsidiaries   65.00%   65.00%    
Credit Agreement | 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   $ 289,700,000   $ 289,700,000    
Due in next 12 months   16,900,000   16,900,000    
Line of credit facility outstanding amount   0   0    
Credit Agreement | Revolving Line of Credit | Subsequent Event | Chef Software            
Line of Credit Facility [Line Items]            
Proceeds from lines of credit $ 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   $ 1,900,000   $ 1,900,000    
Minimum | Credit Agreement            
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%   1.50%    
Minimum | Base Rate | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities   0.50%   0.50%    
Maximum | Credit Agreement            
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%   2.00%    
Maximum | Base Rate | Credit Agreement            
Line of Credit Facility [Line Items]            
Interest rate of credit facilities   1.00%   1.00%