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Summary of Significant Accounting Policies - Changes in Deferred Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Contract with customer, Liability [Roll Forward]    
Deferred revenue, beginning $ 32,089 $ 30,024
Deferral of revenue 35,330 31,926
Recognition of unearned revenue (31,975) (29,861)
Deferred revenue, ending $ 35,444 $ 32,089