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Debt - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Debt      
Available to borrow under the credit facility $ 430,000    
Cash on hand 52,560 $ 61,808  
Letters of Credit Outstanding, Amount 9,900 8,200  
Maximum aggregate short-term borrowings at any month-end 281,000 308,000  
Average aggregate short-term borrowings outstanding $ 175,600 $ 236,400  
Debt instrument interest rate 1.09%    
Weighted average interest rates 3.20% 3.21% 3.03%
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%    
Long-term Debt, Current Maturities $ 20,000    
Short term borrowings outstanding in foreign locations 2,400    
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