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STOCK-BASED COMPENSATION - PERFORMANCE SHARES AND RESTRICTED STOCK ACTIVITY (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Nov. 04, 2025
Nov. 06, 2024
Nov. 15, 2023
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 218,959 190,255 192,121      
Granted (in shares) 132,361 142,800 112,661      
Vested (in shares) (112,408) (112,183) (105,197)      
Cancelled/forfeited (in shares) (1,138) (1,913) (9,330)      
Outstanding at end of period (in shares) 237,774 218,959 190,255      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 43.93 $ 42.60 $ 36.29      
Granted (in dollars per share) 46.94 42.55 46.00      
Vested (in dollars per share) 45.72 39.91 35.07      
Cancelled/forfeited (in dollars per share) 46.00 43.83 38.64      
Outstanding at end of period (in dollars per share) $ 44.75 $ 43.93 $ 42.60      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 5,117 $ 5,271 $ 4,126      
Percent of awards to common stock         124.00% 150.00%
Number of common shares issued (in shares)         49,269 55,832
Percent of awards to common stock, target         100.00% 100.00%
Performance share awards | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       134.00%    
Number of common shares issued (in shares)       54,408    
Percent of awards to common stock, target       100.00%    
Performance share awards | Minimum            
Total Fair Value of Vested Shares            
Percent of awards to common stock 0.00%          
Performance share awards | Maximum            
Total Fair Value of Vested Shares            
Percent of awards to common stock 150.00%          
Performance Shares, TSR            
Total Fair Value of Vested Shares            
Percent of awards to common stock         150.00% 150.00%
Number of common shares issued (in shares)         60,092 59,192
Performance Shares, TSR | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       97.00%    
Number of common shares issued (in shares)       36,754    
Performance-based Restricted Stock            
Total Fair Value of Vested Shares            
Percent of awards to common stock         100.00% 100.00%
Number of common shares issued (in shares)         37,603 30,598
Performance-based Restricted Stock | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       100.00%    
Number of common shares issued (in shares)       36,955    
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 125,500 108,876 97,824      
Granted (in shares) 59,608 70,987 64,080      
Vested (in shares) (61,316) (53,393) (48,312)      
Cancelled/forfeited (in shares)   (970) (4,716)      
Outstanding at end of period (in shares) 123,792 125,500 108,876      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 42.89 $ 41.55 $ 36.90      
Granted (in dollars per share) 46.89 42.59 46.00      
Vested (in dollars per share) 42.93 39.74 40.30      
Cancelled/forfeited (in dollars per share)   44.52 38.77      
Outstanding at end of period (in dollars per share) $ 44.80 $ 42.89 $ 41.55      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 2,869 $ 2,256 $ 1,910