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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, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Long-term debt	$ 838,483	$ 864,899
Unamortized debt issuance costs	(2,171)	(2,478)
Less: Current portion of long-term debt	101,634
Long-term debt, less current portion	736,849	864,899
Series G Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Maturity date	Nov. 15, 2020
Interest rate	3.42%
Series H Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 25,000	25,000
Maturity date	Nov. 15, 2023
Interest rate	4.03%
Series I Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 25,000	25,000
Maturity date	Nov. 15, 2025
Interest rate	4.18%
Series J Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	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
Maturity date	Nov. 15, 2023
Interest rate	4.03%
Series L Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,000	50,000
Maturity date	Nov. 15, 2025
Interest rate	4.18%
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	$ 46,962	43,770
Maturity date	Sep. 23, 2026
Interest rate	1.12%
Series N Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 90,401	84,257
Maturity date	Sep. 23, 2028
Interest rate	1.31%
Series M Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 50,484	47,053
Maturity date	Sep. 23, 2031
Interest rate	1.57%
Series P Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 85,000	85,000
Maturity date	May 30, 2025
Interest rate	4.27%
Series Q Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 85,000	85,000
Maturity date	May 30, 2027
Interest rate	4.35%
Series R Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 75,000	75,000
Maturity date	May 30, 2029
Interest rate	4.41%
Series S Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 75,000	75,000
Maturity date	May 30, 2030
Interest rate	4.46%
Finance Leases [Member]
Debt Instrument [Line Items]
Long-term debt	$ 2,807
Series T Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term debt	$ 80,000	80,000
Maturity date	May 30, 2033
Interest rate	4.61%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt		$ 42,297
Maturity date	Jun. 19, 2024
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.875%
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%

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