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Fair Value Measurements - Narrative (Details) - USD ($) $ in Billions | Mar. 31, 2025 | Sep. 30, 2024
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Fair Value [Line Items] |  |
Fair value of long term debt | $ 8.3 | $ 8.3
Quoted Prices in Active Markets (Level 1) |  |
Fair Value [Line Items] |  |
Fair value of long term debt | 8.0 | 8.1
Significant Other Observable Inputs (Level 2) |  |
Fair Value [Line Items] |  |
Fair value of long term debt | $ 0.3 | $ 0.2

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