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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, 2019
Sep. 30, 2018
Sep. 30, 2017
Nov. 12, 2019
Nov. 13, 2018
Nov. 14, 2017
Performance share awards            
Shares            
Outstanding at beginning of period (in shares) 145,176 156,587 179,916      
Granted (in shares) 100,262 91,177 96,507      
Vested (in shares) (103,009) (100,146) (95,407)      
Cancelled/forfeited (in shares) (11,920) (2,442) (24,429)      
Outstanding at end of period (in shares) 130,509 145,176 156,587      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 39.67 $ 30.12 $ 27.47      
Granted (in dollars per share) 47.98 44.67 33.57      
Vested (in dollars per share) 38.52 29.49 28.88      
Cancelled/forfeited (in dollars per share) 44.34 31.45 29.14      
Outstanding at end of period (in dollars per share) $ 46.53 $ 39.67 $ 30.12      
Total Fair Value of Vested Shares $ 4,622 $ 4,714 $ 4,179      
Percent of awards to common stock         121.00% 119.00%
Number of common shared issued (in shares)         39,694 36,498
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) 59,341 51,931        
Outstanding at end of period (in shares) 63,870 59,341 51,931      
Weighted Average Grant Date Fair Value            
Percent of awards to common stock           108.44%
Number of common shared issued (in shares)           39,595
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)         36,998 28,223
Performance Shares, TSR            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock         99.00%  
Number of common shared issued (in shares)         38,660  
Restricted Stock            
Shares            
Outstanding at beginning of period (in shares) 44,168 51,154 73,071      
Granted (in shares) 35,284 27,949 28,734      
Vested (in shares) (20,748) (33,815) (38,752)      
Cancelled/forfeited (in shares) (548) (1,120) (11,899)      
Outstanding at end of period (in shares) 58,156 44,168 51,154      
Weighted Average Grant Date Fair Value            
Outstanding at beginning of period (in dollars per share) $ 41.24 $ 32.40 $ 29.09      
Granted (in dollars per share) 48.24 45.00 35.79      
Vested (in dollars per share) 39.26 31.23 28.92      
Cancelled/forfeited (in dollars per share) 42.96 33.54 31.56      
Outstanding at end of period (in dollars per share) $ 46.18 $ 41.24 $ 32.40      
Total Fair Value of Vested Shares $ 935 $ 1,438 $ 1,344      
Subsequent Event | Performance share awards            
Weighted Average Grant Date Fair Value            
Percent of awards to common stock       117.00%    
Number of common shared issued (in shares)       26,413    
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)       24,468    
Subsequent Event | 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