EQUITY-BASED INCENTIVE AWARDS: (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
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	146,600
Number of shares that may be awarded under the plan	3,400
Stock options issued and outstanding
Weighted-Average Exercise Price (in dollars per share)		$ 65.97
Weighted Average Exercise Price
Outstanding at the end of the period (in dollars per share)		$ 65.97
Stock Options
Omnibus plan and stock option activity
Granted (in shares)	0	8,000
Share Based Compensation Arrangement by Share Based Payment Award Options Grants in Period Grant Date Fair Value		$ 0.1
Stock Option Pricing Assumptions
Risk-free interest rate (as a percent)		1.46%
Dividend yield (as a percent)		1.10%
Expected volatility (as a percent)		25.00%
Expected life		6 years
Stock options issued and outstanding
Number Outstanding (in shares)	41,600	45,000
Weighted-Average Exercise Price (in dollars per share)	$ 33.69	$ 35.28
Number Exercisable (in shares)	31,200
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 25.35
Number of Shares
Outstanding at the beginning of the period (in shares)	45,000
Granted (in shares)	0	8,000
Exercised (in shares)	(2,600)
Forfeited/ Expired (in shares)	(800)
Outstanding at the end of the period (in shares)	41,600	45,000
Weighted Average Exercise Price
Outstanding at beginning of the period (in dollars per share)	$ 35.28
Exercised (in dollars per share)	$ 53.87
Forfeited/ Expired (in dollars per share)	$ 57.78
Outstanding at the end of the period (in dollars per share)	$ 33.69	$ 35.28
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	0.1
Amortization period of unamortized compensation expense	27 months
Aggregate intrinsic value of options outstanding	2.1	2.1
Aggregate intrinsic value of options exercisable	1.8	1.7
Total fair value of options vested	0.4	0.2
Expiration period	10 years
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
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	2 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)	4,000
Remaining Weighted-Average Contractual Life	5 years 6 months 29 days
Weighted-Average Exercise Price (in dollars per share)	$ 51.50
Number Exercisable (in shares)	3,000
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 51.50
Number of Shares
Outstanding at the end of the period (in shares)	4,000
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)	5,400
Remaining Weighted-Average Contractual Life	7 years 1 month 2 days
Weighted-Average Exercise Price (in dollars per share)	$ 54.93
Number Exercisable (in shares)	1,800
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 55.15
Number of Shares
Outstanding at the end of the period (in shares)	5,400
Weighted Average Exercise Price
Outstanding at the end of the period (in dollars per share)	$ 54.93
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)	7,200
Remaining Weighted-Average Contractual Life	8 years 26 days
Weighted-Average Exercise Price (in dollars per share)	$ 62.33
Number Exercisable (in shares)	1,400
Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 62.33
Number of Shares
Outstanding at the end of the period (in shares)	7,200
Weighted Average Exercise Price
Outstanding at the end of the period (in dollars per share)	$ 62.33