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Debt - Narrative (Details)
9 Months Ended
Dec. 16, 2020
USD ($)
Jan. 24, 2020
GBP (£)
Sep. 23, 2019
GBP (£)
Feb. 28, 2021
USD ($)
May 31, 2020
USD ($)
Feb. 29, 2020
USD ($)
Jan. 05, 2017
USD ($)
Debt (Details) [Line Items]              
Standby letters of credit       $ 4,300,000      
Debt       190,700,000 $ 218,500,000 $ 16,100,000  
Revolving Credit Facility              
Debt (Details) [Line Items]              
Debt       175,000,000.0 200,000,000.0 0  
Loan Agreement              
Debt (Details) [Line Items]              
Maximum borrowing capacity $ 250,000,000.0            
Borrowing capacity 225,000,000.0           $ 375,000,000.0
Liquidity amount 200,000,000.0            
Minimum liquidity $ 300,000,000.0            
Percentage of consolidated assets 10.00%            
Facility fee rate 0.40%            
Acquisition limitation amount $ 25,000,000.0            
Cash dividends limitation 5,200,000            
Transaction restrictions debt maximum 30,000,000.0            
Standby letters of credit       $ 400,000      
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%            
Variable rate, receipt of financial statements 2.25%            
Drawn after delivery 1.60%            
Loan Agreement | Base Rate              
Debt (Details) [Line Items]              
Variable rate, receipt of financial statements 1.25%            
Drawn after delivery 0.60%            
Loan Agreement | London Interbank Offered Rate (LIBOR)              
Debt (Details) [Line Items]              
Variable rate (percentage) 0.25%            
Debt Instrument, All In Rate       2.50%      
Loan Agreement | Federal Funds Rate              
Debt (Details) [Line Items]              
Variable rate (percentage) 0.50%            
UK Long-term Debt              
Debt (Details) [Line Items]              
Face amount of debt | £     £ 2,000,000.0        
Short-term debt       $ 2,800,000      
Debt       7,200,000 10,600,000 6,400,000  
UK Long-term Debt | Line of Credit              
Debt (Details) [Line Items]              
Maximum borrowing capacity | £   £ 6,600,000          
Short-term debt       4,400,000      
Remaining borrowing capacity       $ 4.7      
UK Long-term Debt | Base Rate              
Debt (Details) [Line Items]              
Variable rate (percentage)     1.77% 0.10%      
UK Long-term Debt | Base Rate | Line of Credit              
Debt (Details) [Line Items]              
Variable rate (percentage)   1.77%   0.10%      
Unsecured Debt | Domestic Line of Credit              
Debt (Details) [Line Items]              
Borrowing capacity       $ 10,000,000.0      
Standby letters of credit       3,900,000      
Short-term debt       $ 0 0 0  
Expiration period (in days)       365 days      
Available credit       $ 6,100,000      
Secured Debt | Line of Credit              
Debt (Details) [Line Items]              
Borrowing capacity       $ 31,900,000      
Expiration period (in days)       364 days      
Debt         $ 7,900,000 $ 9,700,000  
Available credit       $ 23,400,000      
Weighted average interest rate (percentage)       4.60% 4.60% 4.60%  
Lines of credit, short-term debt       $ 8,500,000 $ 7,900,000 $ 9,700,000