XML 46 R31.htm IDEA: XBRL DOCUMENT v3.10.0.1
EQUITY-BASED INCENTIVE AWARDS - Stock Options (Details)
$ / shares in Units, $ in Millions
 3 Months Ended
Dec. 31, 2018
USD ($)
plan
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Sep. 30, 2018
$ / shares
shares
Omnibus plan and stock option activity      
Number of incentive plans | plan 2    
Aggregate intrinsic value and fair value of options outstanding      
Compensation expense related to the amortization of all equity - based compensation awards | $ $ 0.3 $ 0.3  
Stock Options      
Omnibus plan and stock option activity      
Expiration period 10 years    
Vesting period 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) 39,250   33,800
Weighted-Average Exercise Price (in dollars per share) | $ / shares $ 78.71   $ 77.85
Number of Shares      
Granted (in shares) 5,450 6,000  
Weighted Average Exercise Price      
Granted (in dollars per share) | $ / shares $ 84.00    
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 89,332    
Number of additional shares that may be awarded under the plan 45,668