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Borrowings (Tables) | 6 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Long-Term Debt | The Company's debt, net of premiums, discounts, and unamortized debt issuance costs consisted of the following as of March 31, 2018 and September 30, 2017:
(In thousands) | Maturity Date |  | March 31, 2018 |  | September 30, 2017
5 3/4% Senior Notes | June 2019 |  | $ | 96,393 |  |  | $ | 321,393 |
8 3/4% Senior Notes | March 2022 |  | 500,000 |  |  | 500,000 |
7 1/4% Senior Notes | February 2023 |  | 24,834 |  |  | 199,834 |
6 3/4% Senior Notes | March 2025 |  | 250,000 |  |  | 250,000 |
5 7/8% Senior Notes | October 2027 |  | 400,000 |  |  | — |
Unamortized debt premium, net |  |  | 3,026 |  |  | 3,413 |
Unamortized debt issuance costs |  |  | (15,905 | ) |  | (14,800 | )
Total Senior Notes, net |  |  | 1,258,348 |  |  | 1,259,840 |
Junior Subordinated Notes (net of unamortized accretion of $37,803 and $38,837, respectively) | July 2036 |  | 62,970 |  |  | 61,937 |
Other Secured Notes payable | Various Dates |  | 4,139 |  |  | 5,635 |
Total debt, net |  |  | $ | 1,325,457 |  |  | $ | 1,327,412 |
Debt Instrument Redemption | For additional redemption features, refer to the table below that summarizes the redemption terms for our Senior Notes:
Senior Note Description |  | Issuance Date |  | Maturity Date |  | Redemption Terms
5 3/4% Senior Notes |  | April 2014 |  | June 2019 |  | Callable at any time before March 15, 2019, in whole or in part, at a redemption price equal to 100% of the principal amount, plus a customary make-whole premium; on or after March 15, 2019, callable at 100% of the principal amount plus, in each case, accrued and unpaid interest
8 3/4% Senior Notes |  | September 2016 |  | March 2022 |  | Callable at any time prior to March 15, 2019, in whole or in part, at a redemption price equal to 100% of the principal amount, plus a customary make-whole premium; on or after March 15, 2019, callable at a redemption price equal to 104.375% of the principal amount; on or after March 15, 2020, callable at a redemption price equal to 102.188% of the principal amount; on or after March 15, 2021, callable at a redemption price equal to 100% of the principal amount plus, in each case, accrued and unpaid interest
7 1/4% Senior Notes |  | February 2013 |  | February 2023 |  | After February 1, 2018, callable at a redemption price equal to 103.625% of the principal amount; on or after February 1, 2019, callable at a redemption price equal to 102.41% of the principal amount; on or after February 1, 2020, callable at a redemption price equal to 101.208% of the principal amount; on or after February 1, 2021, callable at 100% of the principal amount plus, in each case, accrued and unpaid interest
6 3/4% Senior Notes |  | March 2017 |  | March 2025 |  | Callable at any time prior to March 15, 2020, in whole or in part, at a redemption price equal to 100% of the principal amount, plus a customary make-whole premium; on or after March 15, 2020, callable at a redemption price equal to 105.063% of the principal amount; on or after March 15, 2021, callable at a redemption price equal to 103.375% of the principal amount; on or after March 15, 2022, callable at a redemption price equal to 101.688% of the principal amount; on or after March 15, 2023, callable at a redemption price equal to 100.000% of the principal amount, plus, in each case, accrued and unpaid interest
5 7/8% Senior Notes |  | October 2017 |  | October 2027 |  | Callable at any time prior to October 15, 2022, in whole or in part, at a redemption price equal to 100% of the principal amount, plus a customary make-whole premium; on or after October 15, 2022, callable at a redemption price equal to 102.938% of the principal amount; on or after October 15, 2023, callable at a redemption price equal to 101.958% of the principal amount; on or after October 15, 2024, callable at a redemption price equal to 100.979% of the principal amount; on or after October 15, 2025, callable at a redemption price equal to 100.000% of the principal amount, plus, in each case, accrued and unpaid interest

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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=64930739&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=64930785&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=64930785&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 + Details
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