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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, 2024
Sep. 30, 2023
Sep. 30, 2022
Nov. 06, 2024
Nov. 15, 2023
Nov. 09, 2022
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 190,255 192,121 166,091      
Granted (in shares) 142,800 112,661 118,526      
Vested (in shares) (112,183) (105,197) (76,708)      
Cancelled/forfeited (in shares) (1,913) (9,330) (15,788)      
Outstanding at end of period (in shares) 218,959 190,255 192,121      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 42.60 $ 36.29 $ 36.08      
Granted (in dollars per share) 42.55 46.00 38.84      
Vested (in dollars per share) 39.91 35.07 39.57      
Cancelled/forfeited (in dollars per share) 43.83 38.64 37.33      
Outstanding at end of period (in dollars per share) $ 43.93 $ 42.60 $ 36.29      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 5,271 $ 4,126 $ 2,765      
Percent of awards to common stock         150.00% 105.00%
Number of common shares issued (in shares)         55,832 26,282
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       124.00%    
Number of common shares issued (in shares)       49,269    
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% 112.00%
Number of common shares issued (in shares)         59,192 30,472
Performance Shares, TSR | Subsequent Event            
Total Fair Value of Vested Shares            
Percent of awards to common stock       150.00%    
Number of common shares issued (in shares)       60,092    
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)         30,598 28,965
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)       37,603    
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 108,876 97,824 101,621      
Granted (in shares) 70,987 64,080 54,826      
Vested (in shares) (53,393) (48,312) (47,867)      
Cancelled/forfeited (in shares) (970) (4,716) (10,756)      
Outstanding at end of period (in shares) 125,500 108,876 97,824      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 41.55 $ 36.90 $ 36.87      
Granted (in dollars per share) 42.59 46.00 38.84      
Vested (in dollars per share) 39.74 40.30 39.01      
Cancelled/forfeited (in dollars per share) 44.52 38.77 37.06      
Outstanding at end of period (in dollars per share) $ 42.89 $ 41.55 $ 36.90      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 2,256 $ 1,910 $ 1,824