Contractual interest rate for funds borrowed, under the debt agreement.

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

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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

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Borrowings - Debt Redemption (Details) - Senior Notes	3 Months Ended
Borrowings - Debt Redemption (Details) - Senior Notes	Dec. 31, 2016	Sep. 30, 2016
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	105.625%
7 1/2% Senior Notes Maturing September 2021 \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	103.75%
7 1/2% Senior Notes Maturing September 2021 \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.875%
7 1/2% Senior Notes Maturing September 2021 \| Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%
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]
Debt Instrument, Redemption Price, Percentage	100.00%
8 3/4% Senior Notes Maturing March 2022 \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	104.375%
8 3/4% Senior Notes Maturing March 2022 \| Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	102.188%
8 3/4% Senior Notes Maturing March 2022 \| Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, 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]
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%