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EQUITY-BASED INCENTIVE AWARDS - Omnibus Plans and Stock Options (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2021
USD ($)
item
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
EQUITY-BASED INCENTIVE AWARD    
Number of incentive plans | item 2  
Stock options issued and outstanding    
Number Outstanding (in shares) 22,250  
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 86.76  
Omnibus Plans    
EQUITY-BASED INCENTIVE AWARD    
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 116,951  
Number of additional shares that may be awarded under the plan 18,049  
Stock Options    
EQUITY-BASED INCENTIVE AWARD    
Awards issued (in shares) 0 0
Vesting period 5 years  
Stock options issued and outstanding    
Expiration period 10 years  
Number Outstanding (in shares) 22,250 34,350
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 86.76 $ 80.33
Number Exercisable (in shares) 15,680  
Exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 86.33  
Number of Shares    
Granted (in shares) 0 0
Exercised (in shares) (11,600)  
Forfeited/ Expired (in shares) (500)  
Weighted Average Exercise Price    
Exercised (in dollars per share) | $ / shares $ 67.84  
Forfeited/ Expired (in dollars per share) | $ / shares $ 84.00  
Aggregate intrinsic value and fair value of options outstanding    
Compensation expense | $ $ 0.1 $ 0.1
Total unamortized compensation expense | $ $ 0.1  
Amortization period of unamortized compensation expense 20 months  
Aggregate intrinsic value of options outstanding | $ $ 1.1  
Aggregate intrinsic value of options exercisable | $ 0.9  
Total intrinsic value of options exercised | $ 0.9  
Total fair value of options vested | $ $ 0.7 0.4
Stock Options | Maximum    
Aggregate intrinsic value and fair value of options outstanding    
Aggregate intrinsic value of options outstanding | $   0.1
Aggregate intrinsic value of options exercisable | $   0.1
Total intrinsic value of options exercised | $   $ 0.1