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EQUITY-BASED INCENTIVE AWARDS - Stock Options (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 30, 2019
USD ($)
item
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Omnibus plan and stock option activity    
Number of incentive plans | item 2  
Stock options issued and outstanding    
Number Outstanding (in shares) 36,450  
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 78.67  
Stock Options    
Omnibus plan and stock option activity    
Expiration period 10 years 10 years
Vesting period 5 years 5 years
Estimated fair value of the stock option awards using the Black-Scholes option pricing model | $ $ 0.2 $ 0.2
Stock Option Pricing Assumptions    
Risk-free interest rate (as a percent) 2.55% 2.41%
Dividend yield (as a percent) 0.80% 0.80%
Expected volatility (as a percent) 45.10% 33.00%
Expected life 6 years 6 years
Stock options issued and outstanding    
Number Outstanding (in shares) 36,450 33,800
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 78.67 $ 77.85
Number Exercisable (in shares) 19,200  
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 71.01  
Number of Shares    
Granted (in shares) 5,450 6,000
Exercised (in shares) (2,800)  
Weighted Average Exercise Price    
Granted (in dollars per share) | $ / shares $ 84.00  
Exercised (in dollars per share) | $ / shares $ 79.22  
Aggregate intrinsic value and fair value of options outstanding    
Compensation expense related to the amortization of all equity - based compensation awards | $ $ 0.1 $ 0.1
Total unamortized compensation expense | $ $ 0.3  
Amortization period of unamortized compensation expense 38 months  
Aggregate intrinsic value of options outstanding | $ $ 0.2 0.4
Aggregate intrinsic value of options exercisable | $ 0.2 0.3
Total intrinsic value of options | $ 0.1 0.1
Total fair value of options vested | $ $ 0.4 $ 0.4
Omnibus Plan    
Omnibus plan and stock option activity    
Number of shares of the company's common stock permitted for issuance under the plan 135,000  
Number of shares awarded pursuant to the plan 87,132  
Number of additional shares that may be awarded under the plan 47,868