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Debt - Narrative (Details)
£ in Millions
3 Months Ended 10 Months Ended 12 Months Ended 18 Months Ended 22 Months Ended
May 12, 2022
GBP (£)
Mar. 31, 2022
GBP (£)
Oct. 27, 2021
USD ($)
Nov. 30, 2021
USD ($)
Aug. 31, 2021
USD ($)
May 31, 2022
USD ($)
May 31, 2022
USD ($)
Jul. 31, 2021
Jul. 31, 2021
May 31, 2021
USD ($)
Dec. 16, 2020
USD ($)
Sep. 23, 2019
GBP (£)
Debt Instrument [Line Items]                        
Debt, Long-term and Short-term, Combined Amount           $ 6,500,000 $ 6,500,000     $ 190,200,000    
Unsecured Debt                        
Debt Instrument [Line Items]                        
Borrowing capacity           10,000,000.0 10,000,000.0          
Outstanding borrowings           0 0     0    
Remaining borrowing capacity           6.3 $ 6.3          
Maximum | Unsecured Debt                        
Debt Instrument [Line Items]                        
Term of debt instrument             365 days          
Loan Agreement                        
Debt Instrument [Line Items]                        
Standby letters of credit           400,000 $ 400,000          
Line of Credit                        
Debt Instrument [Line Items]                        
Standby letters of credit           3,700,000 3,700,000          
Debt, Long-term and Short-term, Combined Amount           6,500,000 6,500,000     7,900,000    
Line of Credit | Secured Debt                        
Debt Instrument [Line Items]                        
Borrowing capacity           27,300,000 27,300,000          
Remaining borrowing capacity           20,800,000 $ 20,800,000          
Line of Credit | Maximum | Secured Debt                        
Debt Instrument [Line Items]                        
Term of debt instrument             364 days          
Revolving Credit Facility                        
Debt Instrument [Line Items]                        
Debt, Long-term and Short-term, Combined Amount                   175,000,000.0    
Debt Instrument, Periodic Payment, Principal       $ 75,000,000.0 $ 100,000,000.0              
Outstanding borrowings           0 $ 0          
Debt Instrument, Periodic Payment, Principal       $ 75,000,000.0 $ 100,000,000.0              
Outstanding borrowings           0 0          
UK Long-term Debt                        
Debt Instrument [Line Items]                        
Outstanding borrowings           0 0     2,800,000    
Face amount | £                       £ 2.0
Outstanding on loan           $ 0 0          
Debt, Long-term and Short-term, Combined Amount                   7,300,000    
Debt Instrument, Periodic Payment | £ £ 2.0                      
Debt Instrument, Periodic Payment | £ £ 2.0                      
UK Long-term Debt | Base Rate                        
Debt Instrument [Line Items]                        
Variable rate           2.25%     1.77%      
UK Long-term Debt | Line of Credit                        
Debt Instrument [Line Items]                        
Outstanding borrowings           $ 0 0     $ 4,500,000    
Remaining borrowing capacity           $ 0 $ 0          
Debt Instrument, Periodic Payment | £   £ 3.2                    
Debt Instrument, Periodic Payment | £   £ 3.2                    
UK Long-term Debt | Line of Credit | Base Rate                        
Debt Instrument [Line Items]                        
Variable rate           2.25%   1.77%        
Loan Agreement                        
Debt Instrument [Line Items]                        
Borrowing capacity     $ 300,000,000.0               $ 250,000,000.0  
Debt Instrument, Restrictive Covenant, Maximum Consolidated Net Leverage Ratio     2.75                  
Line of Credit Facility, Commitment Fee Percentage             0.20%          
Debt Instrument, Available Increase in Borrowing Capacity     $ 150,000,000.0                  
Debt Instrument, Restrictive Covenant, Maximum Consolidated Net Leverage Ratio     2.75                  
Line of Credit Facility, Commitment Fee Percentage             0.20%          
Debt Instrument, Available Increase in Borrowing Capacity     $ 150,000,000.0                  
Loan Agreement | Minimum                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Commitment Fee Percentage     0.20%                  
Line of Credit Facility, Commitment Fee Percentage     0.20%                  
Loan Agreement | Maximum                        
Debt Instrument [Line Items]                        
Line of Credit Facility, Commitment Fee Percentage     0.30%                  
Line of Credit Facility, Commitment Fee Percentage     0.30%                  
Loan Agreement | Federal Funds Rate                        
Debt Instrument [Line Items]                        
Variable rate     0.50%                  
Loan Agreement | Eurodollar                        
Debt Instrument [Line Items]                        
Variable rate     1.00%                  
Loan Agreement | Base Rate                        
Debt Instrument [Line Items]                        
Variable rate             0.35%          
Loan Agreement | Base Rate | Minimum                        
Debt Instrument [Line Items]                        
Variable rate     0.35%                  
Loan Agreement | Base Rate | Maximum                        
Debt Instrument [Line Items]                        
Variable rate     0.75%                  
Loan Agreement | London Interbank Offered Rate (LIBOR)                        
Debt Instrument [Line Items]                        
Variable rate             1.35%          
Loan Agreement | London Interbank Offered Rate (LIBOR) | Minimum                        
Debt Instrument [Line Items]                        
Variable rate     1.35%                  
Loan Agreement | London Interbank Offered Rate (LIBOR) | Maximum                        
Debt Instrument [Line Items]                        
Variable rate     1.75%                  
Loan Agreement | Swingline Facility                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity     $ 15,000,000.0                  
Loan Agreement | Letter of Credit                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity     $ 50,000,000.0