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EQUITY-BASED INCENTIVE AWARDS - Authorized and Approved Restricted Stock Unit Awards (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2013
Sep. 30, 2018
Sep. 30, 2017
Restricted Stock Units            
Restricted stock units            
Original number of awards issued         13,000  
Non-vested awards outstanding at the end of the period (in shares)         26,811 27,521
Direct cost to the recipients of the restricted stock units         $ 0  
Compensation expense related to the amortization of all equity - based compensation awards         1,200,000 $ 1,300,000
Tax benefit related to compensation expense         300,000 500,000
Total intrinsic value of equity-based compensation awards vested         1,200,000 $ 1,300,000
Total unamortized compensation expense         $ 1,100,000  
Period over which unamortized compensation expense is expected to be amortized         16 months  
Restricted Stock Units Awarded October 2013            
Restricted stock units            
Original number of awards issued       17,600    
Estimated fair value of award at grant date       $ 1,486,000    
Non-vested awards outstanding at the end of the period (in shares)         660  
Fair value of non-vested awards at the end of the period         $ 57,000  
Vested as of the end of the period (in shares)         16,940  
Units scheduled to vest         660  
Restricted Stock Units Awarded October 2013 | Minimum            
Restricted stock units            
Service period       36 months    
Restricted Stock Units Awarded October 2013 | Maximum            
Restricted stock units            
Service period       60 months    
Restricted Stock Units Awarded October 2015            
Restricted stock units            
Original number of awards issued     13,250      
Estimated fair value of award at grant date     $ 1,112,000      
Non-vested awards outstanding at the end of the period (in shares)         4,484  
Fair value of non-vested awards at the end of the period         $ 390,000  
Vested as of the end of the period (in shares)         8,766  
Restricted Stock Units Awarded October 2015 | Vesting in October 2018            
Restricted stock units            
Units scheduled to vest         4,334  
Restricted Stock Units Awarded October 2015 | Vesting annually in October 2018 through October 2020            
Restricted stock units            
Units scheduled to vest         150  
Restricted Stock Units Awarded October 2015 | Minimum            
Restricted stock units            
Service period     36 months      
Restricted Stock Units Awarded October 2015 | Maximum            
Restricted stock units            
Service period     60 months      
Restricted Stock Units Awarded October 2016            
Restricted stock units            
Original number of awards issued   13,000        
Service period   36 months        
Estimated fair value of award at grant date   $ 1,191,000        
Non-vested awards outstanding at the end of the period (in shares)         8,667  
Fair value of non-vested awards at the end of the period         $ 754,000  
Vested as of the end of the period (in shares)         4,333  
Units scheduled to vest         8,667  
Restricted Stock Units Awarded October 2017            
Restricted stock units            
Original number of awards issued 13,000          
Service period 36 months          
Estimated fair value of award at grant date $ 1,177,000          
Non-vested awards outstanding at the end of the period (in shares)         13,000  
Fair value of non-vested awards at the end of the period         $ 1,130,000  
Units scheduled to vest         13,000