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Credit Facilities, Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Long-term debt $ 579,902 $ 655,470
Unamortized debt issuance costs (645) (890)
Less: Current portion of long-term debt 122,934 85,719
Long-term debt, less current portion 456,968 569,751
Series I Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 25,000 25,000
Interest rate 4.18%  
Maturity date Nov. 15, 2025  
Series L Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 50,000 50,000
Interest rate 4.18%  
Maturity date Nov. 15, 2025  
Series M Notes [Member]    
Debt Instrument [Line Items]    
Maturity date Sep. 23, 2026  
Series M Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 46,903 44,656
Interest rate 1.12%  
Maturity date Sep. 23, 2026  
Series N Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 90,289 85,963
Interest rate 1.31%  
Maturity date Sep. 23, 2028  
Series O Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 50,421 48,005
Interest rate 1.57%  
Maturity date Sep. 23, 2031  
Series P Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 0 85,000
Interest rate 4.27%  
Maturity date May 30, 2025  
Series Q Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 85,000 85,000
Interest rate 4.35%  
Maturity date May 30, 2027  
Series R Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 75,000 75,000
Interest rate 4.41%  
Maturity date May 30, 2029  
Series S Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 75,000 75,000
Interest rate 4.46%  
Maturity date May 30, 2030  
Finance Leases [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 2,934 2,736
Series T Notes [Member] | Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 80,000 $ 80,000
Interest rate 4.61%  
Maturity date May 30, 2033