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Senior Notes (Tables) | 12 Months Ended
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Sep. 30, 2017
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, 2017 and 2016:
| September 30, 2017 |  | September 30, 2016
| Carrying Amounts |  | Fair Value |  | Carrying Amounts (1) |  | Fair Value (1)
| (In thousands)
The 2008 Senior Notes | $ | 131,000 |  |  | $ | 134,250 |  |  | $ | 131,000 |  |  | $ | 139,902 |
The 2010 Senior Notes | 113,000 |  |  | 119,106 |  |  | 185,000 |  |  | 195,715 |
Debt issuance costs | (199 | ) |  | (199 | ) |  | (376 | ) |  | (376 | )
Total | $ | 243,801 |  |  | $ | 253,157 |  |  | $ | 315,624 |  |  | $ | 335,241 |
(1) Balances as of September 30, 2016 have been recast as a result of the adoption of ASU 2015-03 to present debt issuance costs of $0.4 million as a direct deduction from the carrying amount of the Senior Notes.
Future Principal Payments For the Senior Notes | Future principal payments for the Senior Notes are as follows (in thousands):
Year Ended September 30, |
2018 | $ | 131,000 |
2019 | 28,000 |
2020 | 85,000 |
Total | $ | 244,000 |

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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://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=84159872&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=75038535&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=84159872&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=84159872&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=84159872&loc=d3e21521-112644 + 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://www.xbrl.org/2003/role/presentationRef -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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