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v3.21.1

Borrowings - Debt Redemption (Details) - Senior Notes | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Sep. 30, 2019 | Oct. 31, 2017 | Mar. 31, 2017
6 3/4% Senior Notes (2025 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate on debt instrument | 6.75% |  |  | 0.0675%
Percentage of principal amount redeemed | 35.00% |  |  |
Redemption price percentage | 106.75% |  |  |
Percentage of principal amount outstanding after redemption | 65.00% |  |  |
6 3/4% Senior Notes (2025 Notes) | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
6 3/4% Senior Notes (2025 Notes) | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 105.063% |  |  |
6 3/4% Senior Notes (2025 Notes) | Debt Instrument, Redemption, Period Three |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 103.375% |  |  |
6 3/4% Senior Notes (2025 Notes) | Debt Instrument, Redemption, Period Four |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 101.688% |  |  |
6 3/4% Senior Notes (2025 Notes) | Debt Instrument, Redemption, Period Five |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
5 7/8% Senior Notes (2027 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate on debt instrument | 5.88% |  | 0.0588% |
Percentage of principal amount redeemed | 35.00% |  |  |
Redemption price percentage | 105.875% |  |  |
Percentage of principal amount outstanding after redemption | 65.00% |  |  |
5 7/8% Senior Notes (2027 Notes) | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
5 7/8% Senior Notes (2027 Notes) | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 102.938% |  |  |
5 7/8% Senior Notes (2027 Notes) | Debt Instrument, Redemption, Period Three |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 101.958% |  |  |
5 7/8% Senior Notes (2027 Notes) | Debt Instrument, Redemption, Period Four |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.979% |  |  |
5 7/8% Senior Notes (2027 Notes) | Debt Instrument, Redemption, Period Five |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
7 1/4% Senior Notes (2029 Notes) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate on debt instrument | 7.25% | 0.0725% |  |
Percentage of principal amount redeemed | 35.00% |  |  |
Redemption price percentage | 107.25% |  |  |
Percentage of principal amount outstanding after redemption | 65.00% |  |  |
7 1/4% Senior Notes (2029 Notes) | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |
7 1/4% Senior Notes (2029 Notes) | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 103.625% |  |  |
7 1/4% Senior Notes (2029 Notes) | Debt Instrument, Redemption, Period Three |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 102.417% |  |  |
7 1/4% Senior Notes (2029 Notes) | Debt Instrument, Redemption, Period Four |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 101.208% |  |  |
7 1/4% Senior Notes (2029 Notes) | Debt Instrument, Redemption, Period Five |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Redemption price percentage | 100.00% |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&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://fasb.org/us-gaap/role/ref/legacyRef -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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