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v3.5.0.2

Borrowings - Debt Redemption (Details) - Senior Notes | 9 Months Ended |
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Jun. 30, 2016 | Sep. 30, 2015
8 1/8% Senior Notes Maturing June 2016 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 8.125% | 8.125%
6 5/8% Senior Secured Notes April 2018 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 6.625% | 6.625%
6 5/8% Senior Secured Notes April 2018 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 103.313% |
6 5/8% Senior Secured Notes April 2018 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 101.656% |
9 1/8% Senior Notes Maturing May 2019 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 9.125% | 9.125%
9 1/8% Senior Notes Maturing May 2019 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 102.281% |
9 1/8% Senior Notes Maturing May 2019 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |
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] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |
7 1/2% Senior Notes Maturing September 2021 |  |
Debt Instrument [Line Items] |  |
Stated interest rate on debt instrument (percent) | 7.50% | 7.50%
7 1/2% Senior Notes Maturing September 2021 | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |
7 1/2% Senior Notes Maturing September 2021 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 105.625% |
7 1/2% Senior Notes Maturing September 2021 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 103.75% |
7 1/2% Senior Notes Maturing September 2021 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 101.875% |
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] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 103.625% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 102.41% |
7 1/4% Senior Notes Maturing February 2023 | Debt Instrument, Redemption, Period Four |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 101.208% |

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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=6479336&loc=d3e64711-112823 + Details
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