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Debt - Narrative (Details)
£ in Millions
12 Months Ended
Feb. 28, 2023
Oct. 27, 2021
USD ($)
May 31, 2023
USD ($)
May 31, 2022
USD ($)
Sep. 23, 2019
GBP (£)
Debt Instrument [Line Items]          
Debt     $ 6,000,000.0 $ 6,500,000  
Loan Agreement          
Debt Instrument [Line Items]          
Standby letters of credit     (400,000)    
Line of Credit          
Debt Instrument [Line Items]          
Debt     6,000,000.0 6,500,000  
Line of Credit | Unsecured Debt          
Debt Instrument [Line Items]          
Borrowing capacity     24,500,000    
Remaining borrowing capacity     18,500,000    
Debt     $ 6,000,000.0    
Line of Credit | Secured Debt          
Debt Instrument [Line Items]          
Line of Credit Facility, Expiration Period     364 days    
Revolving Credit Facility          
Debt Instrument [Line Items]          
Outstanding borrowings     $ 0    
Domestic Line of Credit          
Debt Instrument [Line Items]          
Standby letters of credit     (3,400,000)    
Domestic Line of Credit | Unsecured Debt          
Debt Instrument [Line Items]          
Borrowing capacity     10,000,000.0    
Outstanding borrowings     0 0  
Remaining borrowing capacity     $ 6,600,000    
Line of Credit Facility, Expiration Period     365 days    
Standby Letters of Credit          
Debt Instrument [Line Items]          
Open standby letters of credit     $ 3,800,000 4,100,000  
UK Long-term Debt          
Debt Instrument [Line Items]          
Face amount | £         £ 2.0
Debt       $ 0  
Loan Agreement          
Debt Instrument [Line Items]          
Term of debt instrument   5 years      
Debt instrument, restrictive covenant, maximum consolidated net leverage ratio   2.75      
Line of credit facility, commitment fee percentage     0.20%    
Maximum borrowing capacity   $ 300,000,000.0      
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%      
Loan Agreement | Maximum          
Debt Instrument [Line Items]          
Line of credit facility, commitment fee percentage   0.30%      
Loan Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Variable rate 0.10%   1.35%    
Loan Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum          
Debt Instrument [Line Items]          
Variable rate 1.35%        
Loan Agreement | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum          
Debt Instrument [Line Items]          
Variable rate 1.75%        
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 | 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