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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Feb. 28, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Unvested restricted stock outstanding (in shares)   206,584   177,737
Compensation expense   $ 1.7 $ 1.3  
Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Actual amount of RSUs earned based on cumulative earnings   60.00%    
Restricted Stock Units (RSUs) | Performance Based Restricted Stock Unit        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting period   3 years    
Target RSUs granted range   40.00%    
Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation expense   $ 0.4 $ 0.5  
Restricted Stock | Immediate Vesting        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting, percentage   50.00%    
Restricted Stock | Anniversary of Grant Date        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Vesting, percentage   50.00%    
Non Employee Director Equity Incentive Plan | Restricted Stock        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Shares issued under the plan   2,000    
Restricted stock issued (in shares) 12,000      
Shares issued, price per share under 2014 Director Plan (in dollars per share) $ 27.88