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DEBT - Additional information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
DEBT          
Available to borrow under the credit facility $ 291,000   $ 291,000    
Cash on hand 61,019   61,019   $ 56,232
Long-term Debt, Current Maturities 20,000   20,000    
Letters of Credit Outstanding, Amount $ 7,800   $ 7,800    
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%   100.00%    
Revolving Credit Facility          
DEBT          
Line of Credit Facility, Amount Outstanding $ 500,000   $ 500,000    
Line of Credit Facility, Commitment Fee Amount     $ 250,000    
Debt Instrument, Interest Rate 2.20% 1.16% 1.57% 1.33%  
Maximum          
DEBT          
Incremental term loan $ 250,000   $ 250,000