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Debt - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
DEBT      
Available to borrow under the credit facility $ 337,000    
Cash on hand 56,232 $ 52,560  
Letters of Credit Outstanding, Amount 8,500 9,900  
Maximum aggregate short-term borrowings at any month-end 174,000 281,000  
Average aggregate short-term borrowings outstanding $ 71,300 $ 175,600  
Debt instrument interest rate 1.06%    
Weighted average interest rates 1.20% 3.20% 3.21%
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%    
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