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Credit Facilities, Short-term Borrowings and Long-term Debt (Tables) | 9 Months Ended
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Jun. 30, 2015
Debt Disclosure |
Schedule of Long-term Debt Instruments [Table Text Block] |
|  | June 30, |  | September 30,
|  | 2015 |  | 2014
Revolving credit facility - Floating rate (LIBOR plus 0.85% - 1.65%), due April 2020, unsecured |  |  | 375,000 |  |  | 210,000
Series C notes – 5.92%, due October 2015; unsecured |  |  | 50,000 |  |  | 50,000
Series D notes – 6.39%, due October 2018; unsecured |  |  | 100,000 |  |  | 100,000
Series E notes – 7.81%, due April 2016; unsecured |  |  | 57,000 |  |  | 57,000
Series F notes – 8.24%, due April 2019; unsecured |  |  | 43,000 |  |  | 43,000
Series G notes – 3.42%, due November 2020; unsecured |  |  | 50,000 |  |  | 50,000
Series H notes – 4.03%, due November 2023; unsecured |  |  | 25,000 |  |  | 25,000
Series I notes – 4.18%, due November 2025; unsecured |  |  | 25,000 |  |  | 25,000
Series J notes – Floating rate (LIBOR plus 1.25%), due November 2020; unsecured |  |  | 50,000 |  |  | 50,000
Series K notes – 4.03%, due November 2023; unsecured |  |  | 50,000 |  |  | 50,000
Series L notes – 4.18%, due November 2025; unsecured |  |  | 50,000 |  |  | 50,000
Total long-term debt |  | $ | 875,000 |  | $ | 710,000

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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