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LONG-TERM DEBT (Narrative) (Details) - USD ($)
1 Months Ended 9 Months Ended
May 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Oct. 31, 2001
U.S. Revolver        
Line Of Credit Facility [Line Items]        
Revolving credit facility   $ 75,000,000.0 $ 75,000,000.0  
Revolving credit interest rate     The interest rate for amounts outstanding under the U.S. Revolver is a floating rate based upon the higher of the Federal Funds Rate plus 0.5%, the bank’s prime rate, or the Eurocurrency rate plus 1.00%.  
Revolving credit facility borrowings, outstanding amount   0 $ 0  
Amount of credit facility remaining borrowing capacity   $ 50,400,000 $ 50,400,000  
Credit facility expiration date     Jun. 27, 2022  
Percentage of voting capital stock pledged as collateral   100.00% 100.00%  
Non-domestic subsidiaries of voting capital stock   65.00% 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%  
Canadian Revolver        
Line Of Credit Facility [Line Items]        
Revolving credit facility   $ 7,700,000 $ 7,700,000  
Outstanding letters of credit   0 0  
Industrial Development Revenue Bonds        
Line Of Credit Facility [Line Items]        
Borrowings       $ 8,000,000.0
Reimbursement agreement requires annual redemptions   $ 400,000 $ 400,000  
Interest rate   1.05% 1.05%  
The Third Amendment | U.S. Revolver        
Line Of Credit Facility [Line Items]        
Fee percentage 1.00% 0.875%    
Commitment fee percentage 0.1875% 0.20%    
Cash collateral percent of outstanding debt (at least)   102.00%    
Consolidated current ratio (no less than)   1.10    
Cash collateral pledged balance   $ 25,300,000 $ 25,300,000  
Financial Standby Letter of Credit | U.S. Revolver        
Line Of Credit Facility [Line Items]        
Guarantee liability   $ 24,600,000 $ 24,600,000