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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Apr. 30, 2018
Feb. 28, 2018
Jun. 30, 2018
Jun. 30, 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)     199,317   177,737
Compensation expense     $ 2.0 $ 1.7  
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 $ 0.6  
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 (in shares)     2,000    
Restricted stock issued (in shares) 2,000 12,000      
Shares issued, price per share under 2014 Director Plan (in dollars per share) $ 27.15 $ 27.88