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Debt - Narrative (Details)
3 Months Ended 4 Months Ended 6 Months Ended 18 Months Ended 22 Months Ended
Oct. 27, 2021
USD ($)
Nov. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
Nov. 30, 2021
USD ($)
Nov. 30, 2021
USD ($)
Jul. 31, 2021
Jul. 31, 2021
Nov. 30, 2021
GBP (£)
May 31, 2021
USD ($)
Dec. 16, 2020
USD ($)
Nov. 30, 2020
USD ($)
Sep. 23, 2019
GBP (£)
Debt (Details) [Line Items]                        
Debt   $ 14,300,000   $ 14,300,000 $ 14,300,000       $ 190,200,000   $ 194,800,000  
Standby letters of credit   4,300,000   4,300,000 4,300,000              
Revolving Credit Facility                        
Debt (Details) [Line Items]                        
Debt   0   0 0       175,000,000.0   175,000,000.0  
Payment on long term debt   75,000,000.0 $ 100,000,000.0                  
Short-term debt   0   0 0              
Loan Agreement                        
Debt (Details) [Line Items]                        
Maximum borrowing capacity $ 300,000,000.0                      
Borrowing capacity                   $ 250,000,000.0    
Standby letters of credit   400,000   400,000 $ 400,000              
Commitment fee percentage         0.20%              
Consolidated net leverage ratio, maximum 2.75                      
Increase in borrowing capacity available under accordion feature $ 150,000,000.0                      
Loan Agreement | Minimum                        
Debt (Details) [Line Items]                        
Commitment fee percentage 0.20%                      
Loan Agreement | Maximum                        
Debt (Details) [Line Items]                        
Commitment fee percentage 0.30%                      
Loan Agreement | Swingline Facility                        
Debt (Details) [Line Items]                        
Maximum borrowing capacity $ 15,000,000.0                      
Loan Agreement | Revolving Credit Facility                        
Debt (Details) [Line Items]                        
Maximum borrowing capacity $ 50,000,000.0                      
Loan Agreement | Eurodollar                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 1.00%                      
Loan Agreement | Base Rate                        
Debt (Details) [Line Items]                        
Variable rate (percentage)         0.35%              
Loan Agreement | Base Rate | Minimum                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 0.35%                      
Loan Agreement | Base Rate | Maximum                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 0.75%                      
Loan Agreement | London Interbank Offered Rate (LIBOR)                        
Debt (Details) [Line Items]                        
Variable rate (percentage)         1.35%              
Loan Agreement | London Interbank Offered Rate (LIBOR) | Minimum                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 1.35%                      
Loan Agreement | London Interbank Offered Rate (LIBOR) | Maximum                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 1.75%                      
Loan Agreement | Federal Funds Rate                        
Debt (Details) [Line Items]                        
Variable rate (percentage) 0.50%                      
UK Loan                        
Debt (Details) [Line Items]                        
Debt   6,800,000   6,800,000 $ 6,800,000       7,300,000   11,400,000  
Short-term debt   2,600,000   2,600,000 2,600,000              
Face amount of debt | £                       £ 2,000,000.0
UK Loan | Line of Credit                        
Debt (Details) [Line Items]                        
Maximum borrowing capacity | £               £ 3,200,000        
Short-term debt   4,200,000   4,200,000 4,200,000              
Remaining borrowing capacity   0   $ 0 $ 0              
UK Loan | Base Rate                        
Debt (Details) [Line Items]                        
Variable rate (percentage)       2.25% 0.10%              
UK Loan | Base Rate | Line of Credit                        
Debt (Details) [Line Items]                        
Variable rate (percentage)       2.25% 0.10% 1.77% 1.77%          
Unsecured Debt | Domestic Line of Credit                        
Debt (Details) [Line Items]                        
Borrowing capacity   10,000,000.0   $ 10,000,000.0 $ 10,000,000.0              
Standby letters of credit   3,900,000   3,900,000 3,900,000              
Short-term debt   0   0 0       0   0  
Available credit   6,100,000   6,100,000 $ 6,100,000              
Expiration period (in days)         365 days              
Unsecured Debt | Line of Credit                        
Debt (Details) [Line Items]                        
Borrowing capacity   34,200,000   34,200,000 $ 34,200,000              
Debt   7,500,000   7,500,000 7,500,000       $ 7,900,000   $ 8,400,000  
Available credit   $ 26,700,000   $ 26,700,000 $ 26,700,000              
Expiration period (in days)         364 days              
Weighted average interest rate (percentage)   4.70%   4.70% 4.70%     4.70% 4.70%   4.40%