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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based compensation arrangement by share-based payment award, compensation expense recognition, percentage of target | 50.00% |
2016 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate number of shares that may be awarded (in shares) | 1,196,000 |
Exercise period for shares awarded under 2007 Plan | 10 years |
Stock options may be awarded (in shares) | 447,000 |
Outstanding share awards earned and issued at greater than the target number of shares | 200.00% |
Outstanding share awards earned and issued at greater than the target number of shares next fiscal year | 150.00% |
Stock-based compensation expense (benefit) | $ 469 | $ 398
Total unrecognized compensation cost related to performance and restricted shares awarded | $ 349 |
Period of recognized compensation cost | 1 year |
2016 Plan | Performance shares |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Exercise period for performance shares awarded under 2007 Plan | 3 years |
2016 Plan | Performance shares | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Ultimate number of common shares that may be earned (in shares) | 0 |
2016 Plan | Performance shares | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common shares earned as percentage of initial target number shares awarded | 200.00% |
Common shares earned as percentage of initial target number shares awarded next fiscal year |  | 150.00%
2016 Plan | Restricted shares | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock vesting period | 1 year |
2016 Plan | Restricted shares | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Restricted stock vesting period | 3 years |

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