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Fair Value Measures and Disclosures Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest Income, Other $ 35.1 $ 18.2 $ 1.7