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Debt - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
DEBT    
Available to borrow under the credit facility $ 339,000  
Cash on hand 97,724 $ 56,232
Current maturities of long-term debt 20,000  
Letters of credit outstanding, amount 8,000 8,500
Short-Term debt, maximum month-end outstanding amount $ 208,000 174,000
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%  
Short-Term debt, average outstanding amount $ 189,800 $ 71,300
Debt, weighted average interest rate 2.11% 1.20%
Debt Instrument, Interest Rate 4.12%  
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