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EQUITY-BASED INCENTIVE AWARDS: (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
EQUITY-BASED INCENTIVE AWARDS:    
Number of shares of the company's common stock permitted for issuance under the plan 150,000  
Number of shares awarded pursuant to the plan 130,726  
Number of shares that may be awarded under the plan 19,274  
Stock options issued and outstanding    
Weighted-Average Exercise Price (in dollars per share) $ 65.97  
Weighted Average Exercise Price    
Outstanding at beginning of the period (in dollars per share) $ 54.53  
Outstanding at the end of the period (in dollars per share) $ 65.97  
Aggregate intrinsic value and fair value of options outstanding    
Expiration period 10 years  
Stock Options
    
Omnibus plan and stock option activity    
Granted (in shares) 8,000 6,500
Estimated fair value of the stock option awards using the Black-Scholes option pricing model $ 0.1  
Stock Option Pricing Assumptions    
Risk-free interest rate (as a percent) 1.46% 2.39%
Dividend yield (as a percent) 1.10% 1.10%
Expected volatility (as a percent) 25.00% 27.90%
Expected life 6 years 6 years
Stock options issued and outstanding    
Number Outstanding (in shares) 45,000 37,042
Weighted-Average Exercise Price (in dollars per share) $ 35.28 $ 29.43
Number Exercisable (in shares) 29,600  
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 23.35  
Number of Shares    
Outstanding at the beginning of the period (in shares) 37,042  
Granted (in shares) 8,000 6,500
Exercised (in shares) (42)  
Outstanding at the end of the period (in shares) 45,000 37,042
Weighted Average Exercise Price    
Outstanding at beginning of the period (in dollars per share) $ 29.43  
Granted (in dollars per share) $ 62.33  
Exercised (in dollars per share) $ 28.80  
Outstanding at the end of the period (in dollars per share) $ 35.28 $ 29.43
Aggregate intrinsic value and fair value of options outstanding    
Compensation expense related to the amortization of all equity - based compensation awards 0.1  
Total unamortized compensation expense 0.2  
Amortization period of unamortized compensation expense 36 months  
Aggregate intrinsic value of options outstanding 2.1 1.3
Aggregate intrinsic value of options exercisable 1.7 1.2
Total fair value of options vested 0.2 0.1
Stock Options | Minimum
    
Omnibus plan and stock option activity    
Vesting period 3 years  
Stock Options | Maximum
    
Omnibus plan and stock option activity    
Vesting period 5 years  
Aggregate intrinsic value and fair value of options outstanding    
Compensation expense related to the amortization of all equity - based compensation awards   0.1
Total intrinsic value of options $ 0.1 $ 0.1
Stock Options | Fiscal 2007
    
Stock options issued and outstanding    
Number Outstanding (in shares) 25,000  
Remaining Weighted-Average Contractual Life 3 years 2 months 12 days  
Weighted-Average Exercise Price (in dollars per share) $ 18.00  
Number Exercisable (in shares) 25,000  
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 18.00  
Number of Shares    
Outstanding at the end of the period (in shares) 25,000  
Weighted Average Exercise Price    
Outstanding at the end of the period (in dollars per share) $ 18.00  
Stock Options | Fiscal 2010
    
Stock options issued and outstanding    
Number Outstanding (in shares) 5,500  
Remaining Weighted-Average Contractual Life 6 years 6 months 29 days  
Weighted-Average Exercise Price (in dollars per share) $ 51.50  
Number Exercisable (in shares) 3,300  
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 51.50  
Number of Shares    
Outstanding at the end of the period (in shares) 5,500  
Weighted Average Exercise Price    
Outstanding at the end of the period (in dollars per share) $ 51.50  
Stock Options | Fiscal 2012
    
Stock options issued and outstanding    
Number Outstanding (in shares) 6,500  
Remaining Weighted-Average Contractual Life 8 years 1 month 2 days  
Weighted-Average Exercise Price (in dollars per share) $ 54.74  
Number Exercisable (in shares) 1,300  
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 54.74  
Number of Shares    
Outstanding at the end of the period (in shares) 6,500  
Weighted Average Exercise Price    
Outstanding at the end of the period (in dollars per share) $ 54.74  
Stock Options | Fiscal 2012 | Minimum
    
Stock options issued and outstanding    
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 53.80  
Stock Options | Fiscal 2012 | Maximum
    
Stock options issued and outstanding    
Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 65.97  
Stock Options | Fiscal 2013
    
Stock options issued and outstanding    
Number Outstanding (in shares) 8,000  
Remaining Weighted-Average Contractual Life 9 years 25 days  
Weighted-Average Exercise Price (in dollars per share) $ 62.33  
Number of Shares    
Outstanding at the end of the period (in shares) 8,000  
Weighted Average Exercise Price    
Outstanding at the end of the period (in dollars per share) $ 62.33