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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, 2021
Sep. 30, 2020
Sep. 30, 2019
Nov. 10, 2021
Nov. 09, 2020
Nov. 12, 2019
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 155,731 130,509 145,176      
Granted (in shares) 116,951 82,064 100,262      
Vested (in shares) (54,918) (55,025) (103,009)      
Cancelled/forfeited (in shares) (51,673) (1,817) (11,920)      
Outstanding at end of period (in shares) 166,091 155,731 130,509      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 44.22 $ 46.53 $ 39.67      
Granted (in dollars per share) 33.34 40.61 47.98      
Vested (in dollars per share) 44.64 44.27 38.52      
Cancelled/forfeited (in dollars per share) 45.32 44.38 44.34      
Outstanding at end of period (in dollars per share) $ 36.08 $ 44.22 $ 46.53      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 1,673 $ 2,083 $ 4,622      
Percent of awards to common stock         114.00% 117.00%
Number of common shared issued (in shares)         28,513 26,413
Percent of awards to common stock, target         100.00% 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) 48,941 63,870        
Outstanding at end of period (in shares) 70,138 48,941 63,870      
Total Fair Value of Vested Shares            
Percent of awards to common stock           119.00%
Number of common shared issued (in shares)           43,641
Performance-based Restricted Stock            
Total Fair Value of Vested Shares            
Percent of awards to common stock         100.00% 100.00%
Number of common shared issued (in shares)         11,139 24,468
Performance Shares, TSR            
Total Fair Value of Vested Shares            
Number of common shared issued (in shares)         0  
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 73,486 58,156 44,168      
Granted (in shares) 67,726 42,478 35,284      
Vested (in shares) (34,000) (25,973) (20,748)      
Cancelled/forfeited (in shares) (5,591) (1,175) (548)      
Outstanding at end of period (in shares) 101,621 73,486 58,156      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 43.52 $ 46.18 $ 41.24      
Granted (in dollars per share) 33.34 40.61 48.24      
Vested (in dollars per share) 44.30 44.71 39.26      
Cancelled/forfeited (in dollars per share) 36.34 43.62 42.96      
Outstanding at end of period (in dollars per share) $ 36.87 $ 43.52 $ 46.18      
Total Fair Value of Vested Shares            
Total Fair Value of Vested Shares $ 996 $ 1,073 $ 935      
Subsequent Event | Performance share awards            
Total Fair Value of Vested Shares            
Percent of awards to common stock       93.00%    
Number of common shared issued (in shares)       31,116    
Percent of awards to common stock, target       100.00%    
Subsequent Event | Performance-based Restricted Stock            
Total Fair Value of Vested Shares            
Percent of awards to common stock       100.00%    
Number of common shared issued (in shares)       25,982    
Subsequent Event | Performance Shares, TSR            
Total Fair Value of Vested Shares            
Number of common shared issued (in shares)       0