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v3.23.3

Stock Award Plans - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Contractual term of award (in years) | 10 years |  |  |
Options granted (in shares) | 779,740 | 352,043 | 0 |
Compensation cost for stock options | $ 1,875,000 | $ 1,296,000 | $ 1,676,000 |
Stock Option Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost for stock options, net of forfeitures | $ 4,590,961 |  |  |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Equity instruments other than options, nonvested (in shares) | 495,782 | 489,777 | 522,991 | 409,469
Fair market value at date of grant at restricted stock | $ 12,097,081 |  |  |
Compensation cost for stock options | $ 4,512,000 | $ 4,367,000 | $ 4,473,000 |
Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 3 years |  |  |
Minimum | Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 1 year |  |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 5 years |  |  |
Maximum | Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period (in years) | 7 years |  |  |
2020 Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant (in shares) | 3,200,000 |  |  |
Shares available for issuance (in shares) | 1,129,615 |  |  |

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