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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, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Long-term debt	$ 734,850	$ 838,483
Unamortized debt issuance costs	(1,856)	(2,171)
Less: Current portion of long-term debt	728	101,634
Long-term debt, less current portion	$ 734,122	736,849
Series G Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt		50,000
Interest rate	3.42%
Maturity date	Nov. 15, 2020
Series H Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 25,000	25,000
Interest rate	4.03%
Maturity date	Nov. 15, 2023
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 J Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt		50,000
Maturity date	Nov. 15, 2020
Series J Notes [Member] | Notes Payable to Banks [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Series K Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Interest rate	4.03%
Maturity date	Nov. 15, 2023
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	$ 46,376	46,962
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	$ 89,273	90,401
Interest rate	1.31%
Maturity date	Sep. 23, 2028
Series M Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 49,854	50,484
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	$ 85,000	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]
Debt Instrument [Line Items]
Long-term debt	$ 1,203	2,807
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

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