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Credit Facilities, Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 864,899 |  | $ 1,092,397
Unamortized debt issuance costs | (2,478) |  | (2,895)
Less: Current portion of long-term debt |  |  |
Long-term debt, less current portion | $ 864,899 | $ 1,092,397 | 1,092,397
Series D Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 6.39% |  |
Maturity date | 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% |  |
Maturity date | Apr. 03, 2019 |  |
Long-term debt |  |  | 43,000
Series G Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 3.42% |  |
Maturity date | 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% |  |
Maturity date | 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% |  |
Maturity date | Nov. 15, 2025 |  |
Long-term debt | $ 25,000 |  | 25,000
Series J Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate | 3.37% |  |
Series J Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | 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] |  |  |
Variable interest rate | 1.25% |  |
Series K Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 4.03% |  |
Maturity date | 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% |  |
Maturity date | 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% |  |
Maturity date | Sep. 23, 2026 |  |
Long-term debt | $ 43,770 |  | 46,437
Series N Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.31% |  |
Maturity date | Sep. 23, 2028 |  |
Long-term debt | $ 84,257 |  | 89,393
Series O Notes [Member] | Notes Payable to Banks [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.57% |  |
Maturity date | Sep. 23, 2031 |  |
Long-term debt | $ 47,053 |  | 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] |  |  |
Maturity date | Jun. 19, 2024 |  |
Long-term debt | $ 42,297 |  | $ 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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