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Senior Notes (Tables) | 12 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Senior Notes | The 2008 Senior Notes were issued in four series as follows:
Series | Amount | Interest Rate | Maturity Date
| (In millions) |  |
A | $ | 41.0 |  | 6.37 | % | May 7, 2013
B | $ | 40.0 |  | 6.37 | % | May 7, 2015
C | $ | 63.0 |  | 6.71 | % | May 7, 2015
D | $ | 131.0 |  | 7.18 | % | May 7, 2018
The 2010 Senior Notes were issued in four series as follows:
Series | Amount | Interest Rate | Maturity Date
| (In millions) |  |
E | $ | 60.0 |  | 4.72 | % | July 14, 2016
F | $ | 72.0 |  | 5.04 | % | July 14, 2017
G | $ | 28.0 |  | 5.42 | % | July 14, 2019
H | $ | 85.0 |  | 5.59 | % | July 14, 2020
Principal Amounts Carrying amounts and Fair Values of Senior Notes | The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2018 and 2017:
| September 30, 2018 |  | September 30, 2017
| Carrying Amounts (1) |  | Fair Value |  | Carrying Amounts (1) |  | Fair Value
| (In thousands)
The 2008 Senior Notes | $ | — |  |  | $ | — |  |  | $ | 131,000 |  |  | $ | 134,250 |
The 2010 Senior Notes | 113,000 |  |  | 114,413 |  |  | 113,000 |  |  | 119,106 |
The 2018 Senior Notes | 400,000 |  |  | 404,000 |  |  | — |  |  | — |
Total | $ | 513,000 |  |  | $ | 518,413 |  |  | $ | 244,000 |  |  | $ | 253,356 |
Future Principal Payments For the Senior Notes | Future principal payments for the Senior Notes are as follows (in thousands):
Year Ending September 30, |
2019 | $ | 28,000 |
2020 | 85,000 |
2021 | — |
2022 | — |
2023 | — |
Thereafter | 400,000 |
Total | $ | 513,000 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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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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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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