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Employee Benefit Plans
 12 Months Ended
Sep. 30, 2022
Retirement Benefits [Abstract]  
Employee Benefits Plans Employee Benefit PlansAs of September 30, 2022, the Company maintains a 401(k) Plan (the "401(k) Plan"), a defined contribution and supplemental pension plan for the benefit of its eligible employees. The Company may provide a discretionary matching contribution of a participant's elective contributions under the 401(k) Plan. The Company recorded related expense of $2.2 million and $1.5 million for the years ending September 30, 2022 and 2021. Participants are always fully vested in their elective contributions and vests in Company matching contributions over a four-year period.