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DEBT - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
DEBT          
Available to borrow under the credit facility $ 341,000   $ 341,000    
Cash on hand 100,195   100,195   $ 61,808
Letters of Credit Outstanding, Amount $ 9,800   $ 9,800    
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%   100.00%    
Weighted average interest rates 3.24% 3.20% 3.21% 3.23%  
Long-term Debt, Current Maturities $ 20,000   $ 20,000    
Revolving Credit Facility          
DEBT          
Line of Credit Facility, Amount Outstanding 500,000   500,000    
Line of Credit Facility, Commitment Fee Amount     250,000    
Maximum          
DEBT          
Incremental term loan $ 250,000   $ 250,000