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Short-Term Borrowings and Long-Term Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
quarter
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Debt Instrument [Line Items]        
Short-term borrowings   $ 0   $ 3,524,000
Long-term debt   140,956,000   143,175,000
Debt issuance costs, net   $ 1,500,000    
Mississippi Revenue Bond        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   0.85%    
Long-term debt   $ 4,081,000   $ 4,425,000
Maximum time period of interest (in years)   10 years    
Put option, exercisable period limitation   180 days    
Debt instrument, anniversary, options exercisable, period   5 years    
Percentage of principal due on exercise of put option   100.00%    
Long-term debt, percentage bearing variable interest   1.01%   1.03%
Multi-Currency Revolving Credit Facility, Amended Credit Agreement        
Debt Instrument [Line Items]        
Borrowing capacity under credit facility $ 350,000,000      
Line of credit facility, expiration period 5 years      
Line of credit facility, accordion feature, higher borrowing capacity option $ 250,000,000      
Debt issuance costs, gross $ 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 (up to)   65.00%    
Average daily balance on revolving credit facility   $ 91,200,000 $ 250,800,000  
Line of credit facility, remaining borrowing capacity   330,100,000   $ 257,600,000
Line of credit facility, available for additional borrowings   179,900,000    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Discontinued Operations, Held-for-sale        
Debt Instrument [Line Items]        
Letters of credit outstanding   $ 300,000   300,000
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]        
Percentage spread points on variable rate debt instrument   1.75%    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   1.00%    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | London Interbank Offered Rate (LIBOR) | Maximum        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   1.75%    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   0.75%    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans | Minimum        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   0.00%    
Multi-Currency Revolving Credit Facility, Amended Credit Agreement | Alternate Base Rate Loans | Maximum        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   0.75%    
Term Loan Facility        
Debt Instrument [Line Items]        
Line of credit facility, expiration period 5 years      
Long-term debt $ 150,000,000 $ 136,875,000   138,750,000
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 outstanding $ 50,000,000      
Overdraft Facility        
Debt Instrument [Line Items]        
Borrowing capacity under credit facility   $ 14,000,000.0    
Debt instrument, term   7 days    
Short-term borrowings   $ 0   $ 3,500,000
Overdraft Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Percentage spread points on variable rate debt instrument   1.00%   1.00%