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Debt - Credit Facility (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 05, 2020
Oct. 31, 2020
May 31, 2021
May 31, 2020
May 31, 2021
May 31, 2020
Apr. 30, 2019
Line of Credit Facility [Line Items]              
Long-term debt, maturity, next 12 months     $ 26,338,000   $ 26,338,000    
Amortization of debt issuance costs     202,000 $ 0 300,000 $ 300,000  
Secured Revolving Credit Facility Maturing in 2024              
Line of Credit Facility [Line Items]              
Proceeds from lines of credit   $ 98,500,000          
Credit Agreement              
Line of Credit Facility [Line Items]              
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    
Interest rate of credit facilities     1.75%   1.75%    
Debt issuance cost     $ 2,900,000   $ 2,900,000    
Amortization of debt issuance costs     100,000 $ 100,000      
Credit Agreement | Secured Revolving Credit Facility Maturing in 2024              
Line of Credit Facility [Line Items]              
Aggregate principal amount             $ 301,000,000.0
Unsecured credit facility             100,000,000.0
Additional borrowing capacity available             125,000,000.0
Proceeds from lines of credit $ 98,500,000            
Fair value of term loan     278,400,000   278,400,000    
Long-term debt, maturity, next 12 months     22,600,000   22,600,000    
Credit Agreement | Swing Line Loans              
Line of Credit Facility [Line Items]              
Aggregate principal amount             25,000,000.0
Credit Agreement | Letter of Credit              
Line of Credit Facility [Line Items]              
Aggregate principal amount             $ 25,000,000.0
Letters of credit outstanding     $ 2,500,000   $ 2,500,000