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Revenue - Unearned Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Unearned Revenue [Roll Forward]    
Unearned revenue, beginning of period $ 27,900 $ 21,600
Revenue recognized 20,000 17,500
Unearned revenue, end of period $ 36,800 $ 27,900