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Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |
Unamortized debt issuance costs | $ (1,654) | $ (1,654) | $ (1,794)
Long-term debt, excluding current portion | 588,461 | 588,461 | 580,286
Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt | 588,461 | 588,461 | 580,286
Current portion of long-term debt | 0 | 0 | 0
Long-term debt, excluding current portion | $ 588,461 | $ 588,461 | $ 580,286
Series D Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 6.39% | 6.39% | 6.39%
Maturity date |  | Oct. 01, 2018 | Oct. 01, 2018
Long-term Debt | $ 100,000 | $ 100,000 | $ 100,000
Series F Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 8.24% | 8.24% | 8.24%
Maturity date |  | Apr. 03, 2019 | Apr. 03, 2019
Long-term Debt | $ 43,000 | $ 43,000 | $ 43,000
Series J Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate | 3.12% | 3.12% |
Variable interest rate | 3.12% | 3.12% |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread On Variable Rate |  | 1.25% | 1.25%
Maturity date |  | Nov. 15, 2020 | Nov. 15, 2020
Long-term Debt | $ 50,000 | $ 50,000 | $ 50,000
Series G Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.42% | 3.42% | 3.42%
Maturity date |  | Nov. 15, 2020 | Nov. 15, 2020
Long-term Debt | $ 50,000 | $ 50,000 | $ 50,000
Series H Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.03% | 4.03% | 4.03%
Maturity date |  | Nov. 15, 2023 | Nov. 15, 2023
Long-term Debt | $ 25,000 | $ 25,000 | $ 25,000
Series I Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.18% | 4.18% | 4.18%
Maturity date |  | Nov. 15, 2025 | Nov. 15, 2025
Long-term Debt | $ 25,000 | $ 25,000 | $ 25,000
Series K Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.03% | 4.03% | 4.03%
Maturity date |  | Nov. 15, 2023 | Nov. 15, 2023
Long-term Debt | $ 50,000 | $ 50,000 | $ 50,000
Series L Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.18% | 4.18% | 4.18%
Maturity date |  | Nov. 15, 2025 | Nov. 15, 2025
Long-term Debt | $ 50,000 | $ 50,000 | $ 50,000
Series M Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.12% | 1.12% | 1.12%
Maturity date |  | Sep. 23, 2026 | Sep. 23, 2026
Long-term Debt | $ 49,279 | $ 49,279 | $ 47,270
Series N Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.31% | 1.31% | 1.31%
Maturity date |  | Sep. 23, 2028 | Sep. 23, 2028
Long-term Debt | $ 94,861 | $ 94,861 | $ 90,995
Series O Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.57% | 1.57% | 1.57%
Maturity date |  | Sep. 23, 2031 | Sep. 23, 2031
Long-term Debt | $ 52,975 | $ 52,975 | $ 50,815
Revolving Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable Rate Basis | LIBOR |  |
Revolving Credit Agreement [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread On Variable Rate | 0.85% |  |
Revolving Credit Agreement [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Basis Spread On Variable Rate | 1.65% |  |

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