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Revenue from Contracts with Customers - Capitalized Contract Acquisition Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Capitalized Contract Acquisition Costs [Abstract]      
Balance, beginning of year $ 66,468 $ 77,220 $ 77,836
Additional capitalized contract acquisition costs 35,173 26,960 37,897
Amortization of capitalized contract acquisition costs (35,383) (37,712) (38,513)
Balance, end of year $ 66,258 $ 66,468 $ 77,220