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Long-Term Debt - Narrative (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Oct. 31, 2001
USD ($)
U.S. Revolver        
Line of Credit Facility [Line Items]        
Revolving credit facility   $ 75,000,000    
Revolving credit facility borrowings, outstanding amount   0    
Amount of credit facility remaining borrowing capacity   $ 50,900,000    
Percentage of voting capital stock pledged as collateral   100.00%    
Non-domestic subsidiaries of voting capital stock   65.00%    
U.S. Revolver | Maximum        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.25%    
U.S. Revolver | Federal Funds Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   0.50%    
U.S. Revolver | Eurocurrency Rate        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   1.00%    
Industrial Development Revenue Bonds        
Line of Credit Facility [Line Items]        
Borrowings       $ 8,000,000
Reimbursement agreement requires annual redemptions   $ 400,000    
Interest rate   1.19%    
The Third Amendment | U.S. Revolver        
Line of Credit Facility [Line Items]        
Fee percentage 0.875%   1.00%  
Commitment fee percentage 0.20%   0.1875%  
Cash collateral percent of outstanding debt (at least)   102.00% 102.00%  
Consolidated current ratio (no less than) 1.10      
Cash collateral pledged balance   $ 24,900,000    
Financial Standby Letter of Credit | U.S. Revolver        
Line of Credit Facility [Line Items]        
Guarantee liability   $ 24,100,000