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v3.20.1

Credit Facilities, Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | $ (2,299) | $ (2,478)
Long-term debt | 970,866 | 864,899
Less: Current portion of long-term debt | 101,643 |
Long-term debt, less current portion | $ 869,223 | 864,899
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.42% |
Maturity date | 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% |
Maturity date | 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% |
Maturity date | Nov. 15, 2025 |
Long-term debt | $ 25,000 | 25,000
Series J Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 2.94% |
Maturity date | 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% |
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% |
Maturity date | Nov. 15, 2023 |
Long-term debt | $ 50,000 | 50,000
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 4.18% |
Maturity date | 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% |
Maturity date | Sep. 23, 2026 |
Long-term debt | $ 44,162 | 43,770
Series N Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.31% |
Maturity date | Sep. 23, 2028 |
Long-term debt | $ 85,011 | 84,257
Series O Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.57% |
Maturity date | Sep. 23, 2031 |
Long-term debt | $ 47,474 | 47,053
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 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
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
Finance Leases [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 3,617 |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Maturity date | Jun. 19, 2024 |
Long-term debt | $ 142,901 | $ 42,297
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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