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Debt and Other Obligations Debt and Other Obligations - Secured Debt of VIEs (Details) - USD ($) | Oct. 02, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2013 | Aug. 09, 2013 | Sep. 30, 2012 | Jan. 17, 2012
--- | --- | --- | --- | --- | --- | --- | ---
Variable Interest Entities |  |  |  |  |  |  |
Face Amount |  | $ 40,000,000 |  | $ 360,000,000 |  |  |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount |  | 19,000,000 | $ 19,000,000 |  |  |  |
Long-term debt of variable interest entities (including current maturities) |  | 966,000,000 | 927,000,000 |  |  |  |
Reported Value Measurement |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount |  | 17,000,000 | 18,000,000 |  |  |  |
Long-term debt of variable interest entities (including current maturities) |  | 934,000,000 | $ 968,000,000 |  |  |  |
SCCG |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |
Interest rate |  |  |  |  | 3.846% |  |
JSCCG |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |
Face Amount |  |  |  |  |  | $ 900,000,000 |
Interest rate |  |  |  |  |  |  | 4.626%
Holdco |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |
Face Amount | $ 80,000,000 |  |  |  |  | $ 100,000,000 |
Interest rate |  |  |  |  |  |  | 7.10%
Holdco balloon payment upon maturity |  | $ 10,000,000 |  |  |  |  |

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