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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Nov. 15, 2023
Nov. 09, 2022
Nov. 10, 2021
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 192,121 166,091 155,731      
Granted (in shares) 112,661 118,526 116,951      
Vested (in shares) (105,197) (76,708) (54,918)      
Cancelled/forfeited (in shares) (9,330) (15,788) (51,673)      
Outstanding at end of period (in shares) 190,255 192,121 166,091      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 36.29 $ 36.08 $ 44.22      
Granted (in dollars per share) 46.00 38.84 33.34      
Vested (in dollars per share) 35.07 39.57 44.64      
Cancelled/forfeited (in dollars per share) 38.64 37.33 45.32      
Outstanding at end of period (in dollars per share) $ 42.60 $ 36.29 $ 36.08      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 4,126 $ 2,765 $ 1,673      
Percent of awards to common stock         105.00% 93.00%
Number of common shares issued (in shares)         26,282 31,116
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       150.00%    
Number of common shares issued (in shares)       55,832    
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, Subject to Performance Conditions            
Shares            
Outstanding at beginning of period (in shares) 73,561 70,138        
Outstanding at end of period (in shares) 73,047 73,561 70,138      
Total Fair Value of Vested Shares            
Number of common shares issued (in shares)           0
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)         28,965 25,982
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)       30,598    
Performance Shares, TSR            
Total Fair Value of Vested Shares            
Percent of awards to common stock         112.00%  
Number of common shares issued (in shares)         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)       59,192    
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 97,824 101,621 73,486      
Granted (in shares) 64,080 54,826 67,726      
Vested (in shares) (48,312) (47,867) (34,000)      
Cancelled/forfeited (in shares) (4,716) (10,756) (5,591)      
Outstanding at end of period (in shares) 108,876 97,824 101,621      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 36.90 $ 36.87 $ 43.52      
Granted (in dollars per share) 46.00 38.84 33.34      
Vested (in dollars per share) 40.30 39.01 44.30      
Cancelled/forfeited (in dollars per share) 38.77 37.06 36.34      
Outstanding at end of period (in dollars per share) $ 41.55 $ 36.90 $ 36.87      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 1,910 $ 1,824 $ 996