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DEBT - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
DEBT          
Available to borrow under the credit facility $ 468,000   $ 468,000    
Cash on hand 45,653   45,653   $ 52,560
Letters of Credit Outstanding, Amount $ 10,400   $ 10,400    
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%   100.00%    
Weighted average interest rates 1.27% 3.24% 1.40% 3.21%  
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