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Long-Term Debt - Narrative (Details)
Sep. 27, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Oct. 31, 2001
USD ($)
Line of Credit Facility [Line Items]        
Revolving credit facility borrowings, outstanding amount   $ 800,000 $ 1,200,000  
Industrial Development Revenue Bonds        
Line of Credit Facility [Line Items]        
Borrowings       $ 8,000,000.0
Reimbursement agreement requires annual redemptions   $ 400,000    
Interest rate   0.27%    
Amended And Restated Credit Agreement | U.S. Revolver        
Line of Credit Facility [Line Items]        
Revolving credit facility $ 75,000,000.0      
Revolving credit facility borrowings, outstanding amount   $ 0    
Amount of credit facility remaining borrowing capacity   $ 36,300,000    
Debt covenant, consolidated leverage ratio (less than) 3.0      
Debt covenant, consolidated interest coverage ratio (greater than) 3.0      
Cash collateral pledged balance $ 30,000,000      
Percentage of voting capital stock pledged as collateral 100.00%      
Non-domestic subsidiaries of voting capital stock 65.00%      
Amended And Restated Credit Agreement | U.S. Revolver | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 0.50%      
Amended And Restated Credit Agreement | U.S. Revolver | Eurocurrency Rate | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.75%      
Amended And Restated Credit Agreement | U.S. Revolver | LIBOR        
Line of Credit Facility [Line Items]        
Basis spread on variable rate 1.00%      
Amended And Restated Credit Agreement | U.S. Revolver | Base Rate | Minimum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate (0.25%)