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v3.21.2

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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