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Credit Facilities, Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Long-term debt	$ 1,000,468	$ 1,092,397
Unamortized debt issuance costs	(2,674)	(2,895)
Less: Current portion of long-term debt
Long-term debt, less current portion	$ 1,000,468	$ 1,092,397
Minimum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.85%
Maximum [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.65%
Series D Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	6.39%	6.39%
Maturity date	Oct. 01, 2018	Oct. 01, 2018
Long-term debt		$ 100,000
Series F Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	8.24%	8.24%
Maturity date	Apr. 03, 2019	Apr. 03, 2019
Long-term debt	$ 43,000	$ 43,000
Series G Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	3.42%	3.42%
Maturity date	Nov. 15, 2020	Nov. 15, 2020
Long-term debt	$ 50,000	$ 50,000
Series H Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.03%	4.03%
Maturity date	Nov. 15, 2023	Nov. 15, 2023
Long-term debt	$ 25,000	$ 25,000
Series I Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.18%	4.18%
Maturity date	Nov. 15, 2025	Nov. 15, 2025
Long-term debt	$ 25,000	$ 25,000
Series J Notes [Member]
Debt Instrument [Line Items]
Variable interest rate	3.93%
Variable interest rate	3.93%
Series J Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Maturity date	Nov. 15, 2020	Nov. 15, 2020
Long-term debt	$ 50,000	$ 50,000
Series J Notes [Member] | Notes Payable to Banks [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%	1.25%
Series K Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.03%	4.03%
Maturity date	Nov. 15, 2023	Nov. 15, 2023
Long-term debt	$ 50,000	$ 50,000
Series L Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.18%	4.18%
Maturity date	Nov. 15, 2025	Nov. 15, 2025
Long-term debt	$ 50,000	$ 50,000
Series M Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	1.12%	1.12%
Maturity date	Sep. 23, 2026	Sep. 23, 2026
Long-term debt	$ 44,874	$ 46,437
Series N Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	1.31%	1.31%
Maturity date	Sep. 23, 2028	Sep. 23, 2028
Long-term debt	$ 86,382	$ 89,393
Series O Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	1.57%	1.57%
Maturity date	Sep. 23, 2031	Sep. 23, 2031
Long-term debt	$ 48,240	$ 49,921
Series P Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.27%
Maturity date	May 30, 2025
Long-term debt	$ 85,000	85,000
Series R Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.41%
Maturity date	May 30, 2029
Long-term debt	$ 75,000	75,000
Series S Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.46%
Maturity date	May 30, 2030
Long-term debt	$ 75,000	75,000
Series T Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.61%
Maturity date	May 30, 2033
Long-term debt	$ 80,000	80,000
Series Q Notes [Member] | Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Interest rate	4.35%
Maturity date	May 30, 2027
Long-term debt	$ 85,000	$ 85,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Variable interest rate	3.52%	3.48%
Variable interest rate	3.52%	3.48%
Long-term debt	$ 130,646	$ 116,541
Revolving Credit Agreement [Member]
Debt Instrument [Line Items]
Variable rate basis	LIBOR

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