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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, 2020
Sep. 30, 2019
Sep. 30, 2018
Nov. 09, 2020
Nov. 12, 2019
Nov. 13, 2018
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 130,509 145,176 156,587      
Granted (in shares) 82,064 100,262 91,177      
Vested (in shares) (55,025) (103,009) (100,146)      
Cancelled/forfeited (in shares) (1,817) (11,920) (2,442)      
Outstanding at end of period (in shares) 155,731 130,509 145,176      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 46.53 $ 39.67 $ 30.12      
Granted (in dollars per share) 40.61 47.98 44.67      
Vested (in dollars per share) 44.27 38.52 29.49      
Cancelled/forfeited (in dollars per share) 44.38 44.34 31.45      
Outstanding at end of period (in dollars per share) $ 44.22 $ 46.53 $ 39.67      
Total Fair Value of Vested Shares $ 2,083 $ 4,622 $ 4,714      
Percent of awards to common stock         117.00% 121.00%
Number of common shared issued (in shares)         26,413 39,694
Percent of awards to common stock, target         100.00% 100.00%
Performance share awards | Minimum            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock 0.00%          
Performance share awards | Maximum            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock 150.00%          
Performance Shares, Subject to Performance Conditions            
Shares            
Outstanding at beginning of period (in shares) 63,870 59,341        
Outstanding at end of period (in shares) 48,941 63,870 59,341      
Weighted Average Grant Date Fair Value            
Percent of awards to common stock           99.00%
Number of common shared issued (in shares)           38,660
Performance-based Restricted Stock            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock         100.00% 100.00%
Number of common shared issued (in shares)         24,468 36,998
Performance Shares, TSR            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock         119.00%  
Number of common shared issued (in shares)         43,641  
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 58,156 44,168 51,154      
Granted (in shares) 42,478 35,284 27,949      
Vested (in shares) (25,973) (20,748) (33,815)      
Cancelled/forfeited (in shares) (1,175) (548) (1,120)      
Outstanding at end of period (in shares) 73,486 58,156 44,168      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 46.18 $ 41.24 $ 32.40      
Granted (in dollars per share) 40.61 48.24 45.00      
Vested (in dollars per share) 44.71 39.26 31.23      
Cancelled/forfeited (in dollars per share) 43.62 42.96 33.54      
Outstanding at end of period (in dollars per share) $ 43.52 $ 46.18 $ 41.24      
Total Fair Value of Vested Shares $ 1,073 $ 935 $ 1,438      
Subsequent Event | Performance share awards            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock       114.00%    
Number of common shared issued (in shares)       28,513    
Percent of awards to common stock, target       100.00%    
Subsequent Event | Performance-based Restricted Stock            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock       100.00%    
Number of common shared issued (in shares)       11,139    
Subsequent Event | Performance Shares, TSR            
Weighted Average Grant Date Fair Value            
Number of common shared issued (in shares)       0