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Credit Facilities, Short-term Borrowings and Long-term Debt (Tables) | 9 Months Ended
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Jun. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt |
|  | June 30, |  |  | September 30, |
|  | 2020 |  |  | 2019 |
Long-term portion of revolving credit facility - Floating rate (LIBOR plus 0.875% - 1.75%), due June 19, 2024; unsecured |  | $ | — |  |  | $ | 42,297 |
Series G notes – 3.42%, due November 15, 2020; unsecured |  |  | 50,000 |  |  |  | 50,000 |
Series H notes – 4.03%, due November 15, 2023; unsecured |  |  | 25,000 |  |  |  | 25,000 |
Series I notes – 4.18%, due November 15, 2025; unsecured |  |  | 25,000 |  |  |  | 25,000 |
Series J notes – Floating rate (LIBOR plus 1.25%), due November 15, 2020; unsecured |  |  | 50,000 |  |  |  | 50,000 |
Series K notes – 4.03%, due November 15, 2023; unsecured |  |  | 50,000 |  |  |  | 50,000 |
Series L notes – 4.18%, due November 15, 2025; unsecured |  |  | 50,000 |  |  |  | 50,000 |
Series M notes – 1.12% due September 23, 2026; unsecured |  |  | 44,955 |  |  |  | 43,770 |
Series N notes – 1.31% due September 23, 2028; unsecured |  |  | 86,538 |  |  |  | 84,257 |
Series O notes – 1.57% due September 23, 2031; unsecured |  |  | 48,326 |  |  |  | 47,053 |
Series P notes – 4.27% due May 30, 2025; unsecured |  |  | 85,000 |  |  |  | 85,000 |
Series Q notes – 4.35% due May 30, 2027; unsecured |  |  | 85,000 |  |  |  | 85,000 |
Series R notes – 4.41% due May 30, 2029; unsecured |  |  | 75,000 |  |  |  | 75,000 |
Series S notes – 4.46% due May 30, 2030; unsecured |  |  | 75,000 |  |  |  | 75,000 |
Series T notes – 4.61% due May 30, 2033; unsecured |  |  | 80,000 |  |  |  | 80,000 |
Finance leases (Note 5) |  |  | 3,218 |  |  |  | — |
Unamortized debt issuance costs |  |  | (2,229 | ) |  |  | (2,478 | )
Total long-term debt |  |  | 830,808 |  |  |  | 864,899 |
Less: Current portion of long-term debt |  |  | 101,643 |  |  |  | — |
Long-term debt, less current portion |  | $ | 729,165 |  |  | $ | 864,899 |

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