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EMPLOYEE BENEFIT PLANS - Incentive Compensations Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock shares reserved   10,646,729   10,646,729    
Shares available for grant   1,736,141   1,736,141    
Stock based compensation expense   $ 2,000 $ 2,400 $ 3,714 $ 6,542  
Restricted stock grants- shares       400,788    
Weighted average grant date fair value (in dollars per share)       $ 12.53    
Stock option grants- shares       593,129    
Phantom Share Units (PSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Deferred compensation payout period 3 years          
Noncurrent deferred compensation liability   1,600   $ 1,600   $ 1,000
Share-based compensation expense   200 300 $ 800 400  
Restricted Stock And Restricted Stock Units [Member] | Consultant            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued           22,034
Performance cash            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award requisite service period       3 years    
Performance cash compensation liability   5,200   $ 5,200   $ 7,700
Performance cash compensation expense   $ 100 $ 4,400 $ 1,100 $ 1,400