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Employee Benefit Plans
 12 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Employee Benefits Plans Employee Benefit PlansAs of September 30, 2020, the Company and its subsidiaries maintain 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 $1.2 million in fiscal 2020 and $577 thousand in fiscal year 2019. The increase was primarily due to headcount growth from the S3 acquisition. A participant is always fully vested in his or her elective contributions and vests in Company matching contributions over a four year period.