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Fair Value of Financial Instruments - Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Parenthetical) (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2022
Long-Term Credit Facility        
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]        
Cost $ 218,855 $ 85,619 $ 64,000 $ 169,654