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DEBT - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
DEBT      
Available to borrow under the credit facility $ 434,000    
Cash on hand 57,362   $ 52,560
Letters of Credit Outstanding, Amount $ 9,900    
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%    
Weighted average interest rates 1.45% 3.18%  
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