Stock-Based Compensation - Narrative (Details) - 2016 Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2020
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)	420,000
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)	$ 375	$ 428
Total unrecognized compensation cost related to performance and restricted shares awarded	$ 259
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise period for performance shares awarded under 2007 Plan	3 years
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
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%
Restricted shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	1 year
Restricted shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting period	3 years