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DEBT (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]            
Available to borrow under the credit facility $ 207,000   $ 207,000      
Cash on hand $ 34,955 $ 42,905 34,955 $ 42,905 $ 30,477 $ 45,516
Percentage of foreign subsidiaries' share equity 65.00%          
Letters of Credit Outstanding, Amount $ 8,300   8,300      
Line of Credit Facility, Amount Outstanding $ 217,000   $ 217,000      
Weighted average interest rates 3.20% 2.99% 3.23% 2.87%    
Long-term Debt, Current Maturities $ 20,000   $ 20,000   $ 20,000  
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Amount Outstanding 450,000   450,000      
Line of Credit Facility, Commitment Fee Amount $ 250,000          
Minimum [Member]            
Debt Instrument [Line Items]            
Credit facility fees 12.50%          
Maximum [Member]            
Debt Instrument [Line Items]            
Incremental term loan $ 250,000   $ 250,000      
Credit facility fees 27.50%