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Credit Facilities, Short-term Borrowings and Long-term Debt (Tables) | 6 Months Ended
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Mar. 31, 2020
Credit Facilities, Short-term Borrowings and Long-term Debt [Abstract] |
Schedule of Long-term Debt |
|  | March 31, |  | September 30,
|  | 2020 |  | 2019
Long-term portion of revolving credit facility - Floating rate (LIBOR plus 0.875% - 1.75%), due June 19, 2024; unsecured |  | $ | 142,901 |  | $ | 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 |  |  | 44,162 |  |  | 43,770
Series N notes – 1.31% due September 23, 2028; unsecured |  |  | 85,011 |  |  | 84,257
Series O notes – 1.57% due September 23, 2031; unsecured |  |  | 47,474 |  |  | 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) |  |  | 3,617 |  |  | -
Unamortized debt issuance costs |  |  | (2,299) |  |  | (2,478)
Total long-term debt |  |  | 970,866 |  |  | 864,899
Less: Current portion of long-term debt |  |  | 101,643 |  |  | -
Long-term debt, less current portion |  | $ | 869,223 |  | $ | 864,899

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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