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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
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) 207,483   190,500
Compensation expense (less than for restricted stock) $ 1.2 $ 1.0  
Restricted Stock Units (RSUs) | Time Based Restricted Stock Unit      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock Units (RSUs) | Performance Based Restricted Stock Unit      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Vesting period 3 years    
Restricted Stock      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Compensation expense (less than for restricted stock) $ 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%    
Restricted Stock | Non Employee Director Equity Incentive Plan      
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) 0 0