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v3.19.1

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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