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Short-Term Borrowings and Long-Term Debt (Narrative) (Details)
12 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
quarter
Jun. 30, 2019
USD ($)
Debt Instrument [Line Items]      
Secured debt, term loan   $ 143,175,000 $ 151,014,000
Letter of credit issued   67,714,000 $ 172,390,000
Debt issuance costs with the credit facility and bonds   $ 1,600,000  
Mississippi Revenue Bond [Member]      
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   1.03% 3.28%
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member]      
Debt Instrument [Line Items]      
Borrowing capacity under credit facility $ 350,000,000    
Secured revolving credit facility period 5 years    
Line of credit facility, accordion feature, higher borrowing capacity $ 250,000,000    
Debt issuance costs $ 1,100,000    
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   0.30%  
Percentage of capital stock or other equity interest pledged per credit agreement   65.00%  
Average daily balance on revolving credit facility   $ 235,400,000 $ 296,400,000
Amount available for additional borrowings   257,300,000 149,200,000
Line of credit facility, available for additional borrowings   132,100,000  
Letter of credit issued     0
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Discontinued Operations, Held-for-sale [Member]      
Debt Instrument [Line Items]      
Letter of credit issued   $ 300,000  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Maximum [Member]      
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 [Member] | Minimum [Member]      
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 [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.75%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.75%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   1.00%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Alternate Base Rate Loans [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.75%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Alternate Base Rate Loans [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.75%  
Multi-Currency Revolving Credit Facility, Amended Credit Agreement [Member] | Alternate Base Rate Loans [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   0.00%  
Term Loan Facility [Member]      
Debt Instrument [Line Items]      
Secured revolving credit facility period 5 years    
Secured debt, term loan $ 150,000,000 $ 138,750,000 $ 146,250,000
Multi-Currency Revolving Credit Facility, Combined with Accordion Feature [Member]      
Debt Instrument [Line Items]      
Borrowing capacity under credit facility 750,000,000    
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Letters of credit available for issuance $ 50,000,000