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Borrowings - Debt Redemption (Details) - Senior Notes | 9 Months Ended
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Jun. 30, 2020
6 3/4% Senior Notes Maturing March of 2025 |
Debt Instrument [Line Items] |
Stated interest rate on debt instrument (percent) | 6.75%
Percentage of principal amount redeemed | 35.00%
Redemption price (as a percentage) | 106.75%
Percentage of principal amount outstanding after redemption | 65.00%
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) | 5.88%
Percentage of principal amount redeemed | 35.00%
Redemption price (as a percentage) | 105.875%
Percentage of principal amount outstanding after redemption | 65.00%
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%
7 1/4% Senior Notes Maturing October 2029 |
Debt Instrument [Line Items] |
Stated interest rate on debt instrument (percent) | 7.25%
Percentage of principal amount redeemed | 35.00%
Redemption price (as a percentage) | 107.25%
Percentage of principal amount outstanding after redemption | 65.00%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period One |
Debt Instrument [Line Items] |
Redemption price (as a percentage) | 100.00%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Two |
Debt Instrument [Line Items] |
Redemption price (as a percentage) | 103.625%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Three |
Debt Instrument [Line Items] |
Redemption price (as a percentage) | 102.417%
7 1/4% Senior Notes Maturing October 2029 | Debt Instrument, Redemption, Period Four |
Debt Instrument [Line Items] |
Redemption price (as a percentage) | 101.208%
7 1/4% Senior Notes Maturing October 2029 | 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://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=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://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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