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Commitments and Contingencies - Net Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]    
Operating lease cost $ 6,654 $ 6,754
Variable lease cost 1,537 1,095
Sublease income (358) (185)
Net lease cost $ 7,833 $ 7,664