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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
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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

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