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Short Term Borrowings and Long Term Debt (Narrative) (Details)
12 Months Ended
Apr. 30, 2019
USD ($)
quarter
Aug. 01, 2007
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Debt Instrument [Line Items]        
Secured debt, term loan     $ 123,733,000 $ 135,331,000
Pledged amount of capital stock (as a percent) 65.00%      
Debt issuance costs with the credit facility and bonds     $ 800,000  
Mississippi revenue bond, net of current portion        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate   0.85%    
Maximum time period of interest (in years)   10 years    
Debt instrument, exercisable option limitation, period   180 days    
Debt instrument, anniversary, options exercisable, period   5 years    
Debt instrument, redemption price, percentage   100.00%    
Variable interest rate of debt     1.97% 0.94%
Multi-Currency Revolving Credit Facility, Amended Credit Agreement        
Debt Instrument [Line Items]        
Secured revolving credit facility period 5 years      
Borrowing capacity under credit facility $ 350,000,000      
Line of credit facility, accordion feature, higher borrowing capacity 250,000,000      
Letters of credit available for issuance     $ 0  
Cash $ 15,000,000      
Debt instrument, covenant requirement, leverage ratio, EBITDA, number of quarters in measurement period | quarter 4      
Line of credit facility, unused capacity, commitment fee percentage     0.20%  
Average daily balance on revolving credit facility     $ 69,000,000 $ 54,600,000
Amount available for additional borrowings     $ 214,200,000 350,000,000
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Minimum        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage 0.15%      
Line of credit facility, interest coverage ratio     3.00  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Maximum        
Debt Instrument [Line Items]        
Line of credit facility, unused capacity, commitment fee percentage 0.30%      
Line of credit facility, leverage ratio     3.50  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate     1.25%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.00%      
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 1.75%      
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate     0.25%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans | Minimum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 0.00%      
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans | Maximum        
Debt Instrument [Line Items]        
Debt instrument, basis spread on variable rate 0.75%      
Senior secured term loan facility, net of current portion        
Debt Instrument [Line Items]        
Secured revolving credit facility period 5 years      
Secured debt, term loan $ 150,000,000   $ 120,000,000 $ 131,250,000
Multi-Currency Revolving Credit Facility, Combined with Accordion Feature        
Debt Instrument [Line Items]        
Borrowing capacity under credit facility 750,000,000      
Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit available for issuance $ 50,000,000