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DEBT (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]            
Available to borrow under the credit facility $ 345,000   $ 345,000      
Cash on hand 38,759 $ 34,719 38,759 $ 34,719 $ 39,411 $ 35,131
Incremental term loan 250,000   $ 250,000      
Percentage of foreign subsidiaries' share equity     65.00%      
Letters of Credit Outstanding, Amount 6,800   $ 6,800      
Line of Credit Facility, Amount Outstanding 98,000   98,000      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Amount Outstanding $ 450,000   $ 450,000      
Weighted average interest rates 1.76% 1.27% 1.61% 1.35%    
Line of Credit Facility, Commitment Fee Amount     $ 250,000      
Other Short-term Borrowings $ 900   $ 900      
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%