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Fair Value Measurements - Impairment of Assets Measured at Fair Value on a Nonrecurring Basis Narrative (Details)
$ in Millions
12 Months Ended
Sep. 30, 2023
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Operating Lease, Impairment Loss $ 3.5
Fair Value, Nonrecurring  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Operating Lease, Impairment Loss $ 3.5