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v3.20.2

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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