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Shareholders’ Equity - Restricted Stock Activity Narrative (Details) - Restricted Stock Awards - 2016 Plan - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares nonvested (in shares) 233,346 204,620 202,740 160,310
Number of shares vested (in shares) 105,292 104,012 78,449  
Estimated future compensation expense $ 5,905      
Weighted average period compensation expense will be recorded (in years) 26 months      
Class A        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares available for future issuance (in shares) 103,975      
Tranche One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested (in shares) 80,932      
Tranche Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested (in shares) 69,291      
Tranche Three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested (in shares) 51,892      
Tranche Four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares vested (in shares) 31,231