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DEBT (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt Instrument [Line Items]        
Available to borrow under the credit facility $ 209,000      
Cash on hand $ 36,630 $ 41,600 $ 30,477 $ 45,516
Percentage of foreign subsidiaries' share equity 65.00%      
Letters of Credit Outstanding, Amount $ 8,200      
Line of Credit Facility, Amount Outstanding $ 215,000      
Weighted average interest rates 3.25% 2.74%    
Long-term Debt, Current Maturities $ 20,273   $ 20,000  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding 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      
Credit facility fees 27.50%