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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph e
-SubTopic 470
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480848/942-470-50-3

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Borrowings - Schedule of Debt Redemption (Details)	12 Months Ended
Borrowings - Schedule of Debt Redemption (Details)	Sep. 30, 2023	Sep. 30, 2022
6.750% Senior Notes (2025 Notes) \| Senior Notes
Debt Instrument, Redemption [Line Items]
Stated interest rate on debt instrument	6.75%	6.75%
5.875% Senior Notes (2027 Notes) \| Senior Notes
Debt Instrument, Redemption [Line Items]
Stated interest rate on debt instrument	5.875%	5.875%
7.250% Senior Notes (2029 Notes) \| Senior Notes
Debt Instrument, Redemption [Line Items]
Stated interest rate on debt instrument	7.25%	7.25%
Senior Notes \| 6.750% Senior Notes (2025 Notes) \| Debt Instrument, Redemption, Period One
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Senior Notes \| 6.750% Senior Notes (2025 Notes) \| Debt Instrument, Redemption, Period Two
Debt Instrument, Redemption [Line Items]
Redemption price percentage	105.063%
Senior Notes \| 6.750% Senior Notes (2025 Notes) \| Debt Instrument, Redemption, Period Three
Debt Instrument, Redemption [Line Items]
Redemption price percentage	103.375%
Senior Notes \| 6.750% Senior Notes (2025 Notes) \| Debt Instrument, Redemption, Period Four
Debt Instrument, Redemption [Line Items]
Redemption price percentage	101.688%
Senior Notes \| 6.750% Senior Notes (2025 Notes) \| Debt Instrument, Redemption, Period Five
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Senior Notes \| 5.875% Senior Notes (2027 Notes) \| Debt Instrument, Redemption, Period One
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Senior Notes \| 5.875% Senior Notes (2027 Notes) \| Debt Instrument, Redemption, Period Two
Debt Instrument, Redemption [Line Items]
Redemption price percentage	102.938%
Senior Notes \| 5.875% Senior Notes (2027 Notes) \| Debt Instrument, Redemption, Period Three
Debt Instrument, Redemption [Line Items]
Redemption price percentage	101.958%
Senior Notes \| 5.875% Senior Notes (2027 Notes) \| Debt Instrument, Redemption, Period Four
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.979%
Senior Notes \| 5.875% Senior Notes (2027 Notes) \| Debt Instrument, Redemption, Period Five
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Senior Notes \| 7.250% Senior Notes (2029 Notes) \| Debt Instrument, Redemption, Period One
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%
Senior Notes \| 7.250% Senior Notes (2029 Notes) \| Debt Instrument, Redemption, Period Two
Debt Instrument, Redemption [Line Items]
Redemption price percentage	103.625%
Senior Notes \| 7.250% Senior Notes (2029 Notes) \| Debt Instrument, Redemption, Period Three
Debt Instrument, Redemption [Line Items]
Redemption price percentage	102.417%
Senior Notes \| 7.250% Senior Notes (2029 Notes) \| Debt Instrument, Redemption, Period Four
Debt Instrument, Redemption [Line Items]
Redemption price percentage	101.208%
Senior Notes \| 7.250% Senior Notes (2029 Notes) \| Debt Instrument, Redemption, Period Five
Debt Instrument, Redemption [Line Items]
Redemption price percentage	100.00%