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Debt - Additional information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Debt      
Available to borrow under the credit facility $ 207,000    
Cash on hand 61,808 $ 30,477  
Letters of Credit Outstanding, Amount 8,200 7,800  
Maximum aggregate short-term borrowings at any month-end 308,000 271,000  
Average aggregate short-term borrowings outstanding $ 236,400 $ 258,800  
Weighted average interest rates 3.21% 3.03% 2.09%
Equity interests in direct and indirect material foreign subsidiaries, pledged as collateral (as a percent) 100.00%    
Long-term Debt, Current Maturities $ 21,261 $ 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