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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Restricted stock granted (in shares) 0 0  
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 $ 1.0 $ 0.9  
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 $ 0.1 $ 0.1  
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