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Fair Value Measurements - Narrative (Details) - USD ($) $ in Billions	Jun. 30, 2024	Sep. 30, 2023
Fair Value [Line Items]
Fair value of long term debt	$ 8.3	$ 7.5
Quoted Prices in Active Markets (Level 1)
Fair Value [Line Items]
Fair value of long term debt	8.1	7.1
Significant Other Observable Inputs (Level 2)
Fair Value [Line Items]
Fair value of long term debt	$ 0.2	$ 0.4

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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