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v3.19.2

Credit Facilities, Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,011,147 | $ 1,092,397
Unamortized debt issuance costs | (2,589) | (2,895)
Less: Current portion of long-term debt |  |
Long-term debt, less current portion | $ 1,011,147 | 1,092,397
Series D Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 6.39% |
Maturity date | Oct. 01, 2018 |
Series D Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 100,000
Series F Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 8.24% |
Maturity date | Apr. 03, 2019 |
Series F Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt |  | 43,000
Series G Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 3.42% |
Maturity date | Nov. 15, 2020 |
Series G Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Series H Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% |
Maturity date | Nov. 15, 2023 |
Series H Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 25,000 | 25,000
Series I Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.18% |
Maturity date | Nov. 15, 2025 |
Series I Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 25,000 | 25,000
Series J Notes [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 3.77% |
Maturity date | Nov. 15, 2020 |
Series J Notes [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 1.25% |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Series K Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.03% |
Maturity date | Nov. 15, 2023 |
Series K Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Series L Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.18% |
Maturity date | Nov. 15, 2025 |
Series L Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 50,000 | 50,000
Series M Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.12% |
Maturity date | Sep. 23, 2026 |
Series M Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 45,470 | 46,437
Series N Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.31% |
Maturity date | Sep. 23, 2028 |
Series N Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 87,532 | 89,393
Series O Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 1.57% |
Maturity date | Sep. 23, 2031 |
Series O Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 48,882 | 49,921
Series P Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.27% |
Maturity date | May 30, 2025 |
Series P Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 85,000 | 85,000
Series R Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.41% |
Maturity date | May 30, 2029 |
Series R Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 75,000 | 75,000
Series S Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.46% |
Maturity date | May 30, 2030 |
Series S Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 75,000 | 75,000
Series T Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.61% |
Maturity date | May 30, 2033 |
Series T Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 80,000 | 80,000
Series Q Notes [Member] |  |
Debt Instrument [Line Items] |  |
Interest rate | 4.35% |
Maturity date | May 30, 2027 |
Series Q Notes [Member] | Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 85,000 | 85,000
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Maturity date | Jun. 19, 2024 |
Long-term debt | $ 181,852 | $ 116,541
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 0.875% |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |
Debt Instrument [Line Items] |  |
Variable interest rate | 1.75% |

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