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DEBT - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
DEBT      
Available to borrow under the credit facility $ 341,000    
Cash on hand 96,692   $ 61,808
Letters of Credit Outstanding, Amount $ 8,500    
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%    
Weighted average interest rates 3.18% 3.25%  
Long-term Debt, Current Maturities $ 20,000    
Revolving Credit Facility      
DEBT      
Line of Credit Facility, Amount Outstanding 500,000    
Line of Credit Facility, Commitment Fee Amount 250,000    
Maximum      
DEBT      
Incremental term loan $ 250,000