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Fair Value Measurements Narrative (Details) - USD ($) $ in Millions | 9 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Q3 2023 Restructuring Plan |  |
Restructuring Cost and Reserve [Line Items] |  |
Other Restructuring Costs | $ 3.5 |
Fair Value, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impairment of Intangible Assets (Excluding Goodwill) |  | $ 6.2

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