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DEBT (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Debt Instrument [Line Items]        
Available to borrow under the credit facility $ 265,000      
Cash on hand $ 51,755 $ 39,825 $ 53,825 $ 39,411
Percentage of foreign subsidiaries' share equity 65.00%      
Letters of Credit Outstanding, Amount $ 4,600      
Line of Credit Facility, Amount Outstanding 180,000      
Long-term Debt, Current Maturities 20,000   $ 20,000  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Amount Outstanding $ 450,000      
Weighted average interest rates 1.61% 1.41%    
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%