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Borrowings - Debt Redemption (Details) - Senior Notes | 9 Months Ended |
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Jun. 30, 2018 | Sep. 30, 2017
5 3/4% Senior Notes Maturing June 2019 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 5.75% | 5.75%
5 3/4% Senior Notes Maturing June 2019 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
5 3/4% Senior Notes Maturing June 2019 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) |  |
5 3/4% Senior Notes Maturing June 2019 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) |  |
5 3/4% Senior Notes Maturing June 2019 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) |  |
8 3/4% Senior Notes Maturing March 2022 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 8.75% | 8.75%
8 3/4% Senior Notes Maturing March 2022 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
8 3/4% Senior Notes Maturing March 2022 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 104.375% |
8 3/4% Senior Notes Maturing March 2022 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 102.188% |
8 3/4% Senior Notes Maturing March 2022 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
7 1/4% Senior Notes Maturing February 2023 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 7.25% | 7.25%
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 103.625% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 102.417% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 101.208% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
6 3/4% Senior Notes Maturing March of 2025 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 6.75% | 6.75%
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 105.063% |
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 103.375% |
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 101.688% |
6 3/4% Senior Notes Maturing March of 2025 | Debt Instrument, Redemption, Period Five |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
5 7/8% Senior Notes Maturing October 2027 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 5.875% | 0.00%
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 102.938% |
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 101.958% |
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.979% |
5 7/8% Senior Notes Maturing October 2027 | Debt Instrument, Redemption, Period Five |  |
Debt Instrument [Line Items] |  |
Redemption price (as a percentage) | 100.00% |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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